STMicroelectronics (STM) 20-F24 Feb 212020 FY Annual report (foreign)Financial data

Company Profile

Document and Entity Information

Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2020shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Trading Symbol	STM
Entity Registrant Name	STMicroelectronics N.V.
Entity Central Index Key	0000932787
Current Fiscal Year End Date	--12-31
Entity File Number	1-13546
Entity Incorporation, State or Country Code	P7
Entity Address, Address Line One	WTC Schiphol Airport
Entity Address, Address Line Two	Schiphol Boulevard 265
Entity Address, City or Town	Schiphol
Entity Address, Country	NL
Entity Address, Postal Zip Code	1118 BH
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Document Registration Statement	false
Document Accounting Standard	U.S. GAAP
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding	911,239,420
Title of 12(b) Security	Common shares, nominal value €1.04 per share
Security Exchange Name	NYSE
ICFR Auditor Attestation Flag	true
Business Contact
Document Information [Line Items]
Entity Address, Address Line One	39, Chemin du Champ des Filles
Entity Address, Address Line Two	Plan-Les-Ouates
Entity Address, City or Town	Geneva
Entity Address, Country	CH
Entity Address, Postal Zip Code	1228
Contact Personnel Name	Jean-Marc Chery
City Area Code	22
Local Phone Number	929 29 29
Contact Personnel Fax Number	22 929 29 88

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net revenues	$ 10,219	$ 9,556	$ 9,664
Cost of sales	(6,430)	(5,860)	(5,803)
Gross profit	3,789	3,696	3,861
Selling, general and administrative	(1,109)	(1,093)	(1,095)
Research and development	(1,548)	(1,498)	(1,398)
Other income and expenses, net	202	103	53
Impairment, restructuring charges and other related closure costs	(11)	(5)	(21)
Operating income	1,323	1,203	1,400
Interest income (expense), net	(20)	1	(7)
Other components of pension benefit costs	(12)	(16)	(11)
Income (loss) on equity-method investments	2	1	8
Loss on financial instruments, net	(26)		(1)
Income before income taxes and noncontrolling interest	1,267	1,189	1,389
Income tax expense	(159)	(156)	(96)
Net income	1,108	1,033	1,293
Net income attributable to noncontrolling interest	(2)	(1)	(6)
Net income attributable to parent company stockholders	$ 1,106	$ 1,032	$ 1,287
Earnings per share (Basic) attributable to parent company stockholders	$ 1.24	$ 1.15	$ 1.43
Earnings per share (Diluted) attributable to parent company stockholders	$ 1.20	$ 1.14	$ 1.41
Net Sales [Member]
Net revenues	$ 10,181	$ 9,529	$ 9,612
Other Revenues [Member]
Net revenues	$ 38	$ 27	$ 52

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,108	$ 1,033	$ 1,293
Other comprehensive income (loss), net of tax:
Currency translation adjustments arising during the period	203	(35)	(87)
Foreign currency translation adjustments	203	(35)	(87)
Net unrealized gains (losses) arising during the period		3	(2)
Net unrealized gains (losses) on securities		3	(2)
Net unrealized gains (losses) arising during the period	56	(37)	(79)
Less: reclassification adjustment for (gains) losses included in net income		69	(1)
Net unrealized gains (losses) on derivatives	56	32	(80)
Net gains (losses) arising during the period	(12)	(35)	(11)
Less: amortization of prior service cost included in net periodic pension cost	1	1	1
Defined benefit pension plans	(11)	(34)	(10)
Other comprehensive income (loss), net of tax	248	(34)	(179)
Comprehensive income (loss)	1,356	999	1,114
Less: comprehensive income (loss) attributable to noncontrolling interest	2	1	6
Comprehensive income (loss) attributable to the company's stockholders	$ 1,354	$ 998	$ 1,108

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 3,006	$ 2,597
Restricted cash		10
Short-term deposits	581	4
Marketable securities	133	133
Trade accounts receivable, net	1,465	1,380
Inventories	1,841	1,691
Other current assets	584	442
Total current assets	7,610	6,257
Goodwill	330	162
Other intangible assets, net	445	299
Property, plant and equipment, net	4,596	4,007
Non-current deferred tax assets	739	695
Long-term investments	10	11
Other non-current assets	724	437
Total non-current assets	6,844	5,611
Total assets	14,454	11,868
Current liabilities:
Short-term debt	795	173
Trade accounts payable	1,166	950
Other payables and accrued liabilities	966	831
Dividends payable to stockholders	42	58
Accrued income tax	84	52
Total current liabilities	3,053	2,064
Long-term debt	1,826	1,899
Post-employment benefit obligations	506	445
Long-term deferred tax liabilities	75	19
Other long-term liabilities	488	330
Total non-current liabilities	2,895	2,693
Total liabilities	5,948	4,757
Commitment and contingencies
Parent company stockholders' equity
Common stock (preferred stock: 540,000,000 shares authorized, not issued; common stock: Euro 1.04 par value, 1,200,000,000 shares authorized, 911,239,420 shares issued, 905,415,002 shares outstanding)	1,157	1,157
Additional paid-in capital	3,062	2,992
Retained earnings	3,599	2,747
Accumulated other comprehensive income	723	475
Treasury stock	(93)	(328)
Total parent company stockholders' equity	8,448	7,043
Noncontrolling interest	58	68
Total equity	8,506	7,111
Total liabilities and equity	$ 14,454	$ 11,868

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - € / shares	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, shares authorized	540,000,000	540,000,000
Preferred stock, shares issued	0	0
Common stock, nominal value	€ 1.04	€ 1.04
Common stock, shares authorized	1,200,000,000	1,200,000,000
Common stock, shares issued	911,239,420	911,186,920
Common stock, shares outstanding	905,415,002	891,434,489

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2017	$ 5,467	$ 1,157	$ 2,718	$ (132)	$ 973	$ 688	$ 63
Repurchase of common stock	(62)			(62)
Stock-based compensation expense	125		125	53	(53)
Comprehensive income (loss):
Net income	1,293				1,287		6
Other comprehensive income (loss), net of tax	(179)					(179)
Comprehensive income (loss)	1,114
Dividends to noncontrolling interest	(4)						(4)
Dividends	(216)				(216)
Ending Balance at Dec. 31, 2018	6,424	1,157	2,843	(141)	1,991	509	65
Contribution of noncontrolling interest	8						8
Business combination	61						61
Repurchase of noncontrolling interest	(61)		4				(65)
Repurchase of common stock	(250)			(250)
Stock-based compensation expense	145		145	63	(63)
Comprehensive income (loss):
Net income	1,033				1,032		1
Other comprehensive income (loss), net of tax	(34)					(34)
Comprehensive income (loss)	999
Dividends to noncontrolling interest	(2)						(2)
Dividends	(213)				(213)
Ending Balance at Dec. 31, 2019	7,111	1,157	2,992	(328)	2,747	475	68
Repurchase of common stock	(125)			(125)
Issuance of senior convertible bonds	184		184
Settlement of senior convertible bonds	(11)		(269)	258
Stock-based compensation expense	155		155	102	(102)
Comprehensive income (loss):
Net income	1,108				1,106		2
Other comprehensive income (loss), net of tax	248					248
Comprehensive income (loss)	1,356
Dividends to noncontrolling interest	(12)						(12)
Dividends	(152)				(152)
Ending Balance at Dec. 31, 2020	$ 8,506	$ 1,157	$ 3,062	$ (93)	$ 3,599	$ 723	$ 58

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock [Member]
Dividends, per share	$ 0.168	$ 0.24	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 1,108	$ 1,033	$ 1,293
Items to reconcile net income and cash flows from operating activities:
Depreciation and amortization	923	854	791
Interest and amortization of issuance costs on convertible bonds	44	38	37
Interest on settled convertible bonds	(41)
Loss on financial instruments, net	26		1
Non-cash stock-based compensation	155	145	125
Other non-cash items	(130)	(110)	(116)
Deferred income tax	(8)	25	20
(Income) loss on equity-method investments	(2)	(1)	(8)
Impairment, restructuring charges and other related closure costs, net of cash payments	(3)	(16)	(12)
Changes in assets and liabilities:
Trade receivables, net	(72)	(103)	(155)
Inventories	(84)	(142)	(254)
Trade payables	161	(14)	4
Other assets and liabilities, net	16	160	120
Net cash from operating activities	2,093	1,869	1,845
Cash flows used in investing activities:
Payment for purchase of tangible assets	(1,283)	(1,181)	(1,263)
Proceeds from sale of tangible assets	4	7	1
Proceeds from matured marketable securities		200	100
Investment in short-term deposits, net	(577)
Payment for purchase of intangible assets	(75)	(69)	(50)
Payment for purchase of financial assets		(3)
Proceeds from sale of equity investments	1	1
Payment for business acquisitions, net of cash acquired	(113)	(127)
Net cash used in investing activities	(2,043)	(1,172)	(1,212)
Cash flows from (used in) financing activities:
Proceeds from long-term debt	4	281	281
Net proceeds from issuance of convertible bonds	1,567
Repayment of issued convertible bonds	(709)
Repayment of long-term debt	(184)	(144)	(103)
Repurchase of common stock	(125)	(250)	(62)
Dividends paid to stockholders	(168)	(214)	(216)
Dividends paid to noncontrolling interest	(6)	(2)	(4)
Proceeds from noncontrolling interest		3
Payment of withholding tax on vested shares	(31)	(17)	(18)
Net cash from (used in) financing activities	348	(343)	(122)
Effect of changes in exchange rates	1	(13)	(4)
Net cash increase	399	341	507
Cash, cash equivalents and restricted cash at beginning of the period	2,607	2,266	1,759
Cash, cash equivalents and restricted cash at end of the period	3,006	2,607	2,266
Supplemental cash information:
Interest paid	7	13	12
Income tax paid	$ 138	$ 130	$ 60

The Company

The Company	12 Months Ended
The Company	Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
The Company	1. THE COMPANY STMicroelectronics N.V. (the "Company") is registered in the Netherlands with its corporate legal seat in Amsterdam, the Netherlands, and its corporate headquarters located in Geneva, Switzerland. The Company is a global independent semiconductor company that designs, develops, manufactures and markets a broad range of products, including discrete and standard commodity components, application-specific integrated circuits (“ASICs”), full custom devices and semi-custom devices and application-specific standard products (“ASSPs”) for analog, digital and mixed-signal applications. In addition, the Company participates in the manufacturing value chain of smartcard products, which includes the production and sale of both silicon chips and smartcards.

Accounting Policies

Accounting Policies	12 Months Ended
Accounting Policies	Dec. 31, 2020
Accounting Policies [Abstract]
Accounting Policies	2. ACCOUNTING POLICIES The accounting policies of the Company conform to accounting principles generally accepted in the United States of America (“U.S. GAAP”). All balances and values in the current and prior periods are in millions of U.S. dollars, except share and per-share amounts. Under Article 35 of the Company’s Articles of Association, the financial year extends from January 1 to December 31, which is the period-end of each fiscal year. 2.1 - Principles of consolidation The Company's consolidated financial statements include the assets, liabilities, results of operations and cash flows of its majority-owned subsidiaries. Subsidiaries are fully consolidated from the date on which control is transferred to the Company. They are deconsolidated from the date that control ceases. Intercompany balances and transactions have been eliminated in consolidation. The Company assesses each investment in equity securities to determine whether the investee is a Variable Interest Entity (“VIE”). The Company consolidates the VIEs for which the Company is determined to be the primary beneficiary. The primary beneficiary of a VIE is the party that: (i) has the power to direct the most significant activities of the VIE and (ii) is obligated to absorb losses or has the rights to receive returns that would be considered significant to the VIE. Assets, liabilities, and the noncontrolling interest of newly consolidated VIEs are initially measured at fair value in the same manner as if the consolidation resulted from a business combination. When the Company owns some, but not all, of the voting stock of a consolidated entity, the shares held by third parties represent a noncontrolling interest. The consolidated financial statements are prepared based on the total amount of assets and liabilities and income and expenses of the consolidated subsidiaries. However, the portion of these items that does not belong to the Company’s shareholders is reported on the line “Noncontrolling interest” in the consolidated financial statements. 2.2 - Use of estimates The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. The primary areas that require significant estimates and judgments by management include, but are not limited to: • sales returns and allowances, • inventory obsolescence reserves and normal manufacturing capacity thresholds to determine costs capitalized in inventory, • recognition and measurement of loss contingencies, • valuation at fair value of assets acquired, including intangibles, goodwill, investments and tangible assets, and liabilities assumed, including deferred and contingent consideration on business acquisitions, • annual and trigger-based impairment review of goodwill and intangible assets, as well as the assessment of events which could trigger impairment testing on long-lived assets, • assumptions used in measuring expected credit losses and impairment charges on financial assets, • recognition and measurement of restructuring charges and other exit costs; • assumptions used in assessing the number of awards expected to vest on stock-based compensation plans, • assumptions used in calculating pension obligations and other long-term employee benefits, • allocation between debt and equity of the various components of an issued, or settled, hybrid instrument and measurement at fair value of the liability component based on the income approach, and • determination of the amount of tax expected to be paid and tax benefit expected to be received, including deferred income tax assets, valuation allowance and provisions for uncertain tax positions and claims. The Company bases the estimates and assumptions on historical experience and on various other factors such as market trends, market information used by market participants and the latest available business plans that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities. COVID-19 pandemic did not result in significant impacts on these estimates. While the Company regularly evaluates its estimates and assumptions, the actual results experienced by the Company could differ materially and adversely from those estimates. 2.3 - Foreign currency The U.S. dollar is the reporting currency of the Company. The U.S. dollar is the currency of the primary economic environment in which the Company operates, since the worldwide semiconductor industry uses the U.S. dollar as a currency of reference for actual pricing in the market. Furthermore, the majority of the Company’s transactions are denominated in U.S. dollars, and revenues from external sales in U.S. dollars largely exceed revenues in any other currency. However, certain significant costs are incurred in the countries of the Eurozone and other non-U.S. dollar currency areas. The functional currency of each subsidiary of the Company is either the local currency or the U.S. dollar, depending on the basis of the economic environment in which each subsidiary operates. Foreign currency transactions, including operations in local currency when the U.S. dollar is the functional currency, are measured into the functional currency using the prevailing exchange rate. Foreign exchange gains and losses resulting from the re-measurement at reporting date of monetary assets and liabilities denominated in currencies other than the functional currency are recognized in the consolidated statements of income on the line “Other income and expenses, net”. For consolidation purposes, the results and financial position of the subsidiaries whose functional currency is different from the U.S. dollar are translated into the reporting currency as follows: (a) assets and liabilities for each consolidated balance sheet presented are translated at the closing exchange rate as of the balance sheet date; (b) income and expenses for each consolidated statement of income presented are translated at the average monthly exchange rate; (c) the resulting exchange differences are reported as Currency Translation Adjustments (“CTA”), a component of “Other comprehensive income (loss)” in the consolidated statements of comprehensive income. 2.4 – Cash and cash equivalents Cash and cash equivalents include cash on hand, deposits held at call with external financial institutions and other short-term highly liquid investments with original maturities of three months or less. They are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. 2.5 - Trade accounts receivable Trade accounts receivable are amounts due from customers for goods sold and services rendered to third parties in the ordinary course of business. Prior to the adoption of the new ASC 326 guidance on January 1, 2020, the Company reported trade accounts receivable net of allowance for doubtful accounts. The Company evaluated its customers’ financial condition periodically and recorded an allowance for any specific account it considered as doubtful. Additionally, the Company maintained an allowance for doubtful accounts for estimated losses resulting from its customers’ inability to make required payments. The carrying amount of the receivable was thus reduced by an allowance account, and the amount of the corresponding charge was recognized in the line “Selling, general and administrative” in the consolidated statements of income. Subsequent recoveries, if any, of amounts previously provided for were credited against the same line in the consolidated statements of income. When a trade receivable was uncollectible, it was written-off against the allowance account for trade accounts receivable. With the adoption of ASC 326 guidance starting January 1, 2020, the Company uses a lifetime expected losses allowance for all trade receivables. The allowance includes reasonable assumptions about future credit trends. The historical loss rates are adjusted to reflect current and forward-looking information on macroeconomic factors affecting the ability of the Company’s customers to settle the receivables. Adjustments to the expected credit losses allowance are reported on the line “Selling, general and administrative” in the consolidated statements of income and write-offs, if any, are recorded against the expected credit losses allowance, consistent with prior guidance. In the event of transfers of receivables such as factoring, the Company derecognizes the receivables only to the extent that the Company has surrendered control over the receivables in exchange for a consideration other than beneficial interest in the transferred receivables. 2.6 – Inventories Inventories are stated at the lower of cost and net realizable value. Cost is based on the weighted average cost by adjusting standard cost to approximate actual manufacturing costs on a quarterly basis; the cost is therefore dependent on the Company’s manufacturing performance. In the case of underutilization of manufacturing facilities, the costs associated with unused capacity are not included in the valuation of inventories but charged directly to cost of sales. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company performs, on a continuous basis, write-offs of finished products, which have the characteristics of slow-moving, old production dates and technical obsolescence. The Company evaluates its inventory to identify obsolete or slow-selling items, as well as inventory that is not of saleable quality and records a specific reserve if the Company estimates the inventory will eventually become obsolete. Reserve for obsolescence is estimated for excess uncommitted inventory based on the previous quarters sales, order backlog and production plans. 2.7 - Income taxes Income tax for the period comprises current and deferred income tax. Current income tax represents the income tax expected to be paid or the tax benefit expected to be received related to the current year taxable profit and loss in each tax jurisdiction. Deferred income tax is recognized, using the liability method, for all temporary differences arising between the tax bases of assets and liabilities and their carrying amount in the consolidated financial statements. Deferred tax liabilities are not recognized on the initial recognition of goodwill as a result of a business combination. Deferred income tax is determined using tax rates and laws that are enacted at the balance sheet date and are expected to apply when the related deferred income tax asset is realized or the deferred income tax liability is settled. The effect on deferred tax assets and liabilities from changes in tax laws and tax rates is recognized on the line “Income tax benefit (expense)” in the consolidated statements of income in the period in which the law is enacted. Deferred income tax assets are recognized in full but the Company assesses whether future taxable profit will be available against which temporary differences can be utilized. A valuation allowance is provided for deferred tax assets when management considers it is more likely than not that they will not be realized. The Company recognizes a deferred tax liability on undistributed earnings of subsidiaries when there is a presumption that taxable earnings will be remitted to the parent. A deferred tax asset is recognized on compensation for the grant of stock awards to the extent that such charge constitutes a temporary difference in the subsidiaries’ local tax jurisdictions. Changes in the stock price do not result in any adjustments to the deferred tax asset prior to vesting. At each reporting date, the Company assesses all significant income tax positions in all tax jurisdictions to determine any uncertain tax positions. The Company uses a two-step process for the evaluation of uncertain tax positions. The first step consists in assessing whether the tax benefit must be recognized. The second step consists in measuring the amount of tax benefit to be recognized on each uncertain tax position. In step 1 (recognition), the Company assesses whether a tax position, based solely on its technical merits, is more likely than not to be sustained upon examination. Only tax positions with a sustainability threshold higher than 50% are recognized. In Step 2 (measurement), the Company determines the amount of recognizable tax benefit. The measurement methodology is based on a “cumulative probability” approach, resulting in the recognition of the largest amount that is greater than 50% likely of being realized upon settlement with the taxing authority. The Company accrues for interest and penalties on uncertain tax liabilities reported on the consolidated balance sheets. Interests and penalties are classified as components of income tax expense in the consolidated statements of income. 2.8 – Assets held for sale Asset groups are classified as assets held for sale when their carrying amount is to be recovered principally through a sale transaction rather than through continuing use. The asset groups are classified as assets held for sale when the following main conditions have been met: management has approved the plan to sell; assets are available for immediate sale; assets are actively being marketed; sale is probable of occurring within one year; price is reasonable in the market and it is unlikely that there will be significant changes in the assets to be sold or a withdrawal to the plan to sell. Asset groups classified as held for sale are reported as current assets in the consolidated balance sheets at the lower of their carrying amount and fair value less costs to sell. Long-lived assets classified as held for sale are no longer depreciated. When the held-for-sale accounting treatment requires an impairment charge for the difference between the carrying amount and fair value, such impairment is reflected on the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs”. 2.9 – Business combinations and goodwill The acquisition method of accounting is applied to all business combinations. The identifiable assets acquired, liabilities assumed, and equity instruments issued are measured at fair value on the acquisition date. Any contingent purchase price and acquired contingencies are recorded at fair value on the acquisition date and remeasured at each reporting date. Acquisition-related transaction costs and restructuring costs relating to the acquired business are expensed as incurred. Acquired in-process research and development (“IPR&D”) is capitalized and recorded as an intangible asset on the acquisition date, subject to impairment testing until the research or development is completed or abandoned. The excess of the consideration transferred over the acquisition-date fair value of the identifiable assets acquired and liabilities assumed, net of related deferred tax impacts, is recorded as goodwill. In case of a bargain purchase, the Company reassesses whether it has correctly identified all of the assets acquired and all of the liabilities assumed, the noncontrolling interest in the acquiree, if any, the Company’s previously held equity interest in the acquiree, if any, and the consideration transferred. If after this review, a bargain purchase is still indicated, it is recognized in earnings attributable to parent company stockholders. The purchase of additional interests in a partially owned subsidiary is treated as an equity transaction as well as all transactions concerning the sale of subsidiary stock or the issuance of stock by the partially owned subsidiary, as long as there is no change in control of the subsidiary. If as a consequence of selling subsidiary shares, the Company no longer controls the subsidiary, the Company recognizes a gain or loss in earnings. Goodwill is carried at cost less accumulated impairment losses, if any. Goodwill is not amortized but is tested annually for impairment, or more frequently if indicators of impairment exist. Goodwill subject to potential impairment is tested at the reporting unit level. The impairment test determines whether the fair value of each reporting unit under which goodwill is allocated is lower than the total carrying amount of relevant net assets allocated to such reporting unit, including its allocated goodwill. Before the adoption on January 1, 2020 of the new guidance which simplifies the accounting for goodwill impairment, the implied fair value of the reporting unit goodwill was compared to the carrying value of the goodwill and an impairment charge was recognized for any excess in the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs”. With the adoption of the new guidance effective on January 1, 2020, this hypothetical purchase price allocation is not required and a goodwill impairment charge, if any, is recorded for the amount by which a reporting unit’s carrying value exceeds its fair value. Significant management judgments and estimates are used in forecasting the future discounted cash flows associated with the reporting unit, including: the applicable industry’s sales volume forecast and selling price evolution, the reporting unit’s market penetration and its revenues evolution, the market acceptance of certain new technologies and products, the relevant cost structure, the discount rates applied using a weighted average cost of capital and the perpetuity rates used in calculating cash flow terminal values. 2.10 – Intangible assets with definite useful lives Intangible assets subject to amortization include the intangible assets purchased from third parties recorded at cost and intangible assets acquired in business combinations initially recorded at fair value. Amortization begins when the intangible asset is available for its intended use. Amortization reflects the pattern in which the asset’s economic benefits are consumed, which usually consists in applying the straight-line method to allocate the cost of the intangible assets over the estimated useful life. The carrying value of intangible assets with definite useful lives is evaluated whenever changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized in the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs” for the amount by which the asset’s carrying amount exceeds its fair value. The Company evaluates the remaining useful life of an intangible asset at each reporting date to determine whether events and circumstances warrant a revision to the remaining period of amortization. Technologies and licenses Separately acquired technologies and licenses are recorded at historical cost. Technologies and licenses acquired in a business combination are initially recognized at fair value at the acquisition date. Technologies and licenses have a useful life which usually ranges from 3 to 8 years and are carried at cost less accumulated amortization and impairment losses, if any. Computer software Separately acquired computer software is recorded at historical cost. Costs associated with maintaining computer software programs are expensed as incurred and reported as “Cost of sales”, “Selling, general and administrative”, or “Research and development” in the consolidated statements of income according to their intended use. The capitalization of costs for internally generated software developed by the Company for its internal use begins when the preliminary project stage is completed and when the Company, implicitly or explicitly, authorizes and commits to funding a computer software project. It must be probable that the project will be completed and will be used to perform the function intended. Amortization of computer software begins when the software is available for its intended use and is calculated using the straight-line method 2.11 – Property, plant and equipment Property, plant and equipment are stated at historical cost, net of accumulated depreciation and any impairment losses. Property, plant and equipment acquired in a business combination are initially recognized at fair value at the acquisition date. Land is not depreciated. Depreciation on fixed assets is computed using the straight-line method over their estimated useful lives, as follows: Buildings 33 years Facilities and leasehold improvements 5-10 years Machinery and equipment 2-10 years Computer and R&D equipment 3-6 years Other 2-5 years The Company evaluates each period whether there is reason to suspect that tangible assets or groups of assets held and used might not be recoverable. Several impairment indicators exist for making this assessment, such as: restructuring plans, significant changes in the technology, market, economic or legal environment in which the Company operates, available evidence of obsolescence of the asset, or indication that its economic performance is, or will be, worse than expected. In determining the recoverability of assets to be held and used, the Company initially assesses whether the carrying value of the tangible assets or group of assets exceeds the undiscounted cash flows associated with these assets . If exceeded, the Company then evaluates whether an impairment charge is required by determining if the asset’s carrying value also exceeds its fair value . This fair value is normally estimated by the Company based on independent market appraisals or the sum of discounted future cash flows, using market assumptions such as the utilization of the Company’s fabrication facilities and the ability to upgrade such facilities, change in the selling price and the adoption of new technologies . At each reporting date or when impairment indicators are identified, t he Company also evaluates, and adjusts if appropriate, the assets’ useful lives . When property, plant and equipment are retired or otherwise disposed of, the net book value of the assets is removed from the Company’s books. Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are included in “Other income and expenses, net” in the consolidated statements of income. 2.12 – Leases The Company recognizes lease arrangements on the consolidated balance sheet as right-of-use assets as a category within “Property, plant and equipment, net”. For income statement purposes, leases are classified as either operating or finance leases. Lease arrangements in which the Company has substantially all the risks and rewards of ownership are classified as finance leases. Operating lease expenses are recognized in the consolidated statements of income, on a straight-line basis over the lease period and reported as “Cost of sales”, “Selling, general and administrative”, or “Research and development”, according to the intended use of the leased asset. A lease contract is a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use assets within the line “Property, plant and equipment, net” on the consolidated balance sheets. Current operating lease liabilities are included in the line “Other payables and accrued liabilities”, while noncurrent operating lease liabilities are included in the line “Other long-term liabilities” on the Company’s consolidated balance sheets. Finance leases are included in the line “Property, plant and equipment, net” and “Long-term debt” on the consolidated balance sheets. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The right-of-use asset is a nonmonetary asset while the lease liability is a monetary liability. When accounting for a lease that is denominated in a foreign currency, the lease liability is remeasured using the current exchange rate, while the right-of-use asset is measured using the historical exchange rate as of the commencement date. Certain lease contracts contain options to extend the lease. On these contracts, t commencement date only. Additionally, lease contracts with a sum of lease payments not exceeding $5,000 are The Company does not separate lease and non-lease components and instead accounts for each separate lease component and the non-lease components associated with that lease component as a single lease component. Variable lease payments that depend on an index or a rate are included in the lease payments and are measured using the prevailing index or rate at the measurement date. Changes to index and rate-based variable lease payments are recognized in earnings in the period of the change. The rate implicit in the lease should be used whenever that rate is readily determinable. In most cases, this rate is not readily determinable and the Company uses its incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. The Company gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. 2.1 3 – Loss contingencies In determining loss contingencies, the Company considers the likelihood of the incurrence of a liability as well as the ability to reasonably estimate the amount of such loss or liability. An estimated loss from a loss contingency is accrued when information available indicates that it is probable that a liability has been incurred at the date of the consolidated financial statements and when the amount of the loss can be reasonably estimated. 2.1 4 – Long-term debt (a) Convertible debt The Company evaluates, at initial recognition of a convertible debt, the different components and features of the hybrid instruments and determines whether certain elements are embedded derivative instruments which require bifurcation. Components of convertible debt instruments that may be settled in cash upon conversion based on a net-share settlement basis are accounted for separately as long-term debt and equity when the conversion feature of the convertible bonds constitute an embedded equity instrument. When an equity instrument is identified, proceeds from issuance are allocated between debt and equity by measuring first the liability component and then determining the equity component as a residual amount. The liability component is measured as the fair value of a similar nonconvertible debt, which results in the recognition of a debt discount. In subsequent periods, the Company amortizes the debt discount through earnings on the line “Interest income (expense), net” of the consolidated statements of income, using the effective interest method, based on the contractual maturity of the debt. The equity component, reported on the line “Additional Paid-in Capital” of the consolidated statement of equity, is not remeasured. Deferred taxes are recognized on the difference between the carrying amount of the liability component and its tax basis. Debt issuance costs are reported as a deduction of debt. They are subsequently amortized through earnings on the line “Interest income (expense), net” of the consolidated statements of income, using the effective interest rate method. In case of conversion from the bondholders, the fair value of the consideration transferred is allocated between the liability component and the equity component. The difference between the carrying amount of the debt at the settlement date and the fair value of the debt component is recorded in earnings as a loss on debt extinguishment and reported on the line “Loss on financial instruments, net” of the consolidated statements of income. The liability component is measured as the fair value of a similar nonconvertible debt prior to settlement. The reacquired equity component is recorded in equity and reported on the line “Additional Paid-in Capital” of the consolidated statement of equity. (b) Bank loans Bank loans and non-convertible senior bonds are recognized at the amount of cash proceeds received, net of debt issuance costs incurred. They are subsequently reported at amortized cost; any difference between the proceeds (net of debt issuance costs) and the principal amount is recognized through earnings on the line “Interest income (expense), net” of the consolidated statements of income over the period of the borrowings using the effective interest method. 2.15– Employee benefits (a) Pension obligations The Company sponsors various pension schemes for its employees. These schemes conform to local regulations and practices in the countries in which the Company operates. Such plans include both defined benefit and defined contribution plans. For defined benefit pension plans, the liability recognized in the consolidated balance sheets is the present value of the defined benefit obligation at the balance sheet date less the fair value of plan assets. The overfunded or underfunded status of the defined benefit plans are calculated as the difference between plan assets and the projected benefit obligations. Estimates are used in determining the assumptions incorporated in the calculation of the pension obligations, which is supported by input from independent actuaries. Actuarial gains and losses arising from changes in actuarial assumptions are recognized in “Accumulated Other Comprehensive Income (Loss)” in the consolidated statements of equity and are charged or credited to earnings over the employees’ expected average remaining working lives. Past service costs are recognized in “Accumulated Other Comprehensive Income (Loss)” in the consolidated statements of equity and are amortized on a straight-line basis over the vesting period. The net periodic benefit cost of the year is determined based on the assumptions used at the end of the previous year . Past service costs are recognized in earnings on the line “Other components of pension benefit costs” of the consolidated statements of income if the changes to the pension scheme are not conditional on the employees remaining in service for a specified period (the vesting period) . For defined contribution pension plans, the Company pays contributions to publicly or privately administered pension insurance plans on a mandatory, contractual or voluntary basis. The Company has no further payment obligations once the contributions have been paid. The contributions are recognized as employee benefit expense when they are due. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in the future payments is available. The service cost component of net periodic benefit costs is presented in the same income statement line as other employee compensation costs arising from services rendered during the period. The other components of the net periodic benefit cost are presented separately, outside operating income, on the line “Other components of pension benefit costs” of the consolidated statements of income. These elements include: interest cost; expected return on plan assets; amortization of transition (asset) obligation; amortization of prior service cost; amortization of net (gain) loss; (gain) loss recognized due to curtailment or settlement and; cost of special termination benefits. (b) Other post-employment obligations The Company provides post-employment benefits to some of its retirees. The entitlement to these benefits is usually conditional on the employee remaining in service up to retirement age and on the completion of a minimum service period. The expected costs of these benefits are accrued over the period of employment using an accounting methodology similar to that for defined benefit pension plans. Actuarial gains and losses arising from changes in actuarial assumptions are charged or credited to earnings over the expected average remaining working lives of the related employees. (c) Termination benefits Termination bene

Short-Term Deposits and Marketa

Short-Term Deposits and Marketable Securities	12 Months Ended
Short-Term Deposits and Marketable Securities	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Short-Term Deposits and Marketable Securities	3. SHORT-TERM DEPOSITS AND MARKETABLE SECURITIES To optimize the return yield on its short-term investments, the Company invested $581 million of available cash in short-term deposits as at December 31, 2020. These short-term deposits represent cash equivalents with original maturity beyond three months and no significant risk of changes in fair value. Changes in the fair value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2020 and December 31, 2019 are detailed in the tables below: December 31, 2019 Purchase Proceeds at maturity Change in fair value included in OCI* Change in fair value recognized in earnings December 31, 2020 U.S. Treasury debt securities 133 — — — — 133 Total 133 — — — — 133 * Other Comprehensive Income December 31, 2018 Purchase Proceeds at maturity Change in fair value included in OCI* Change in fair value recognized in earnings December 31, 2019 U.S. Treasury debt securities 330 — (200 ) 3 — 133 Total 330 — (200 ) 3 — 133 * Other Comprehensive Income As at December 31, 2020 , the Company held $133 million of U.S. Treasury Bonds, all transferred to a financial institution with high credit quality. These transactions were concluded in compliance with the Company’s policy to optimize the return on its short-term interest rate investments, always placed with institutions with high credit rating. The Company, acting as the securities lender, does not hold any collateral on the unsecured securities lending transactions. The Company retains effective control on the transferred securities. U.S. Treasury Bonds totaling $200 million matured in 2019. The amount was reported as “proceeds from matured marketable securities” in the consolidated statement of cash flows for the year ended December 31, 2019. The debt securities had an average rating of Aaa/AA+/AAA from Moody’s, S&P and Fitch, respectively, with a weighted average maturity of 0.5 O n January 1, 2020 , the Company adopted the new ASC 326 guidance which provides a modified impairment model applicable to available-for-sale debt securities. The new credit impairment model does not significantly differ from the previous “Other-than-temporary impairment” model (“OTTI”) defined in prior guidance. The new model retains the same criteria, while it does not take into consideration the length of time during which the fair value has been lower than amortized cost when assessing the existence of a credit loss. At adoption date and as at December 31, 2020, the fair value of the U.S. Treasury Bonds was higher than the amortized cost of the debt securities. Consequently, no impairment had occurred, and no allowance was recognized as at December 31, 2020.

Trade Accounts Receivable, Net

Trade Accounts Receivable, Net	12 Months Ended
Trade Accounts Receivable, Net	Dec. 31, 2020
Receivables [Abstract]
Trade Accounts Receivable, Net	4 . TRADE ACCOUNTS RECEIVABLE, NET Trade accounts receivable, net consisted of the following: December 31, December 31, 2020 2019 Trade accounts receivable 1,481 1,396 Current expected credit losses allowance ("CECLA")* (16 ) (16 ) Total 1,465 1,380 * Allowance for doubtful accounts as at December 31, 2019 Prior to the adoption of the new ASC 326 guidance, the Company reported trade accounts receivable net of allowance for doubtful accounts. The Company evaluated its customers’ financial condition periodically and recorded an allowance for any specific account it considered as doubtful. Additionally, the Company maintained an allowance for doubtful accounts for estimated losses resulting from its customers’ inability to make required payments. The carrying amount of the receivable was thus reduced by an allowance account, and the amount of the corresponding charge was recognized in the line “Selling, general and administrative” in the consolidated statements of income. Subsequent recoveries, if any, of amounts previously provided for were credited against the same line in the consolidated statements of income. When a trade receivable was uncollectible, it was written-off against the allowance account for trade accounts receivable. With the adoption of the ASC 326 guidance starting January 1, 2020, the Company uses a lifetime expected losses allowance for all trade receivables based on failure rates, as applied to the gross amounts of trade accounts receivable. Based on the new ASC 326 requirements, the CECLA also includes reasonable assumptions about future credit trends. The historical loss rates are adjusted to reflect current and forward-looking information on macroeconomic factors affecting the ability of the Company’s customers to settle the receivables. In addition to the factors already embedded in the failure rates, as applied on trade accounts receivable, the Company has identified cyclicality and uncertainties around continued growth for the semiconductor industry and its serviceable available market to be the most relevant factors. These macroeconomic factors are weighted into four different economic scenarios, in line with estimates and methodologies applied by other business entities, including financial institutions. These scenarios range from upside scenario (above-trend economic growth) to severe downside (recession). At adoption date, major weight was given to the baseline and mild downside scenarios, with no significant adjustment to the allowance for doubtful accounts. As at December 31, 2020, following the uncertainties arising from the COVID-19 pandemic and the impact it may have on future economic and market conditions, major weight was given to mild downside and severe downside macroeconomic scenarios, with no significant adjustments to the expected credit loss rates as used in the measurement of the allowance for trade accounts receivable. On that basis, the changes in reported CECLA for the year ended December 31, 2020 are presented below: Allowance for doubtful accounts as at December 31, 2019 (under prior ASC 326) (16) Amount recognized through opening retained earnings upon new ASC 326 — CECLA as at January 1, 2020 (under new ASC 326) (16) Current-period adjustment to CECLA — CECLA as at December 31, 2020 (16) Adjustments to the expected credit losses allowance are reported in the line “Selling , general and administrative” in the consolidated statements of income. There were no significant write-offs in 2020, 2019 and 2018. In 2020, 2019 and 2018, the Company’s largest customer, Apple From time to time, the Company enters into factoring transactions to accelerate the realization in cash of some trade accounts receivable. In 2020, no trade accounts receivable were sold without recourse ($75 million in 2019).

Inventories

Inventories	12 Months Ended
Inventories	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	5. INVENTORIES Inventories consisted of the following: December 31, December 31, 2020 2019 Raw materials 175 137 Work-in-process 1,120 1,104 Finished products 546 450 Total 1,841 1,691 Reserve for obsolescence is estimated for excess uncommitted inventories based on the previous quarters sales, backlog of orders and production plans.

Other Current Assets

Other Current Assets	12 Months Ended
Other Current Assets	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other Current Assets	6. OTHER CURRENT ASSETS Other current assets consisted of the following: December 31, 2020 December 31, 2019 Receivables from government agencies 244 216 Taxes and other government receivables 114 71 Advances 39 47 Prepayments 70 56 Loans and deposits 8 8 Interest receivable 3 9 Derivative instruments 65 8 Other current assets 41 27 Total 584 442 Derivative instruments are further With the adoption on January 1, 2020 of the ASC 326 new guidance, the Company applies a current expected credit losses (CECL) model on all financial assets measured at amortized cost, including deposits, loans and receivables. The major portion of other current assets to which the CECL model applies corresponds to government receivables. Due to the existing history of zero-default on receivables originated by governments, the expected credit losses are assumed to be not significant at January 1, 2020 and December 31, 2020. Other current assets presented in the table above within the lines "Loans and deposits" and “Other current assets” are composed of individually insignificant amounts at exposure of default. Consequently, no significant loss allowance was reported on those current assets as at adoption date and reporting date.

Business Combinations

Business Combinations	12 Months Ended
Business Combinations	Dec. 31, 2020
Business Combinations [Abstract]
Business Combinations	7. BUSINESS COMBINATIONS 2020 Acquisitions In the second quarter of 2020, the Company closed the acquisition of French Gallium Nitride (GaN) innovator Exagan. Exagan’s expertise in epitaxy, product development and application know-how will broaden and accelerate ST’s power GaN roadmap and business for automotive, industrial and consumer applications. Exagan acquisition has been accounted for as a business combination. The activities of this business are included in the Automotive and Discrete Group (ADG) reportable segment. In the third quarter of 2020, the Company closed the acquisitions of the entire share capital of Ultra Wide Band specialist BeSpoon, of the cellular IoT connectivity assets of Riot Micro and of the radio-frequency assets of SOMOS. Through these transactions, the Company will further strengthen its offer for wireless connectivity in the roadmap for STM32 microcontrollers and secure MCUs. These three acquisitions have been accounted for as business combinations. The activities of these businesses are included in the Microcontrollers and Digital ICs Group (MDG) reportable segment. In the fourth quarter of 2020, the Company completed another minor acquisition in the Microcontrollers and Digital ICs Group (MDG) reportable segment. This acquisition has been accounted for as a business combination. As at December 31, 2020, the purchase price allocation of the above business acquisitions was subject to finalization. The preliminary fair value at acquisition date of the identifiable assets acquired and liabilities assumed were as follows: Fair value recognized at acquisition date Property, plant and equipment 1 Technologies & licenses 108 Technologies in progress 10 Other intangible assets 2 Deferred tax assets 5 Deferred tax liabilities (18) Net working capital (4) Goodwill (1) 135 Total net assets at fair value 239 Purchase consideration 239 (1) The items that generated goodwill are workforce, synergies, future products and access to new markets. The goodwill is allocated to the ADG and MDG reportable segments as described in Note 8. An amount of $45 million of goodwill was estimated to be tax deductible. As of the acquisition date, the total consideration transferred in relation to the business acquisitions concluded in 2020 consisted of cash paid of $104 million, before cash acquired of $1 million, deferred consideration of $18 million and contingent consideration of $117 million. The fair value of the consideration transferred was determined by the Company with the assistance of a third party as part of the preliminary purchase price allocation. Deferred and contingent consideration recognized on business combinations amounted to $143 million as at December 31, 2020. The fair value measurement of the contingent consideration corresponds to a Level 3 fair value hierarchy measurement and is further described in Note 28 . The amount paid of $103 million for the above-mentioned business combinations was reported in the line “Payment for business acquisitions, net of cash acquired” in the consolidated statement of cash flows for the year ended December 31, 2020. 2019 Acquisitions In 2019, the Company acquired the Swedish silicon carbide (SiC) wafer manufacturer Norstel AB (“Norstel”). This acquisition extends the Company’s silicon carbide ecosystem and strengthens the Company’s flexibility to serve fast growing automotive and industrial applications. The purchase consideration, net of $1 million of cash acquired, was funded with available cash. The full acquisition was executed in two stages. On February 6, 2019, the Company acquired 55% of Norstel’s common stock, obtaining control over the entity. The fair value of the business as a whole was estimated at $138 million, of which $77 million was paid by the Company for its majority stake, with an option to acquire the remaining 45% at a later date, subject to certain conditions. On December 2, 2019, the Company exercised its option to acquire the remaining 45% stake. The Company paid $51 million to complete the closing of the full acquisition. An amount of $10 million was held in an escrow account as protection for any claims, and reported as current restricted cash in the consolidated balance sheet as at December 31, 2019. The escrow amount was released to the seller in 2020 and the amount paid was reported in the line “Payment for business acquisitions, net of cash acquired” in the consolidated statement of cash flows for the year ended December 31, 2020. Norstel acquisition was accounted for as a business combination. The activities of this business are included in the Automotive and Discrete Group (ADG) reportable segment. The purchase price allocation was finalized in 2020, and resulted in recognition of a deferred tax liability of $18 million associated with the acquired technology in process, as well as a deferred tax asset of $4 million arising from Norstel’s net operating losses. A corresponding $14 million increase in goodwill was recorded in 2020, resulting in $57 million of total goodwill recognized on this acquisition. The final fair value of the assets acquired and liabilities assumed from Norstel were as follows: Fair value recognized at acquisition date Measurement period adjustments Fair value recognized as a result of acquisition Property, plant and equipment 11 — 11 Technology in progress 86 — 86 Deferred tax assets — 4 4 Deferred tax liabilities — (18) (18) Net working capital (2) — (2) Goodwill (1) 43 14 57 Total net assets at fair value 138 — 138 Purchase consideration 138 — 138 (1) The primary item that generated goodwill is the value of the future synergies between Norstel technology in silicon carbide and the Company, which do not qualify as a separately identified intangible asset. The goodwill is allocated to the ADG reportable segment as described in Note 8.

Goodwill

Goodwill	12 Months Ended
Goodwill	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	8. GOODWILL Goodwill allocated to reportable segments as at December 31, 2020 and 2019 and changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 are as follows: Automotive and Discrete Group (ADG) Microcontrollers and Digital ICs Group (MDG) Analog, MEMS & Sensors Group (AMS) Total December 31, 2018 — 119 2 121 Business combination 43 — — 43 Foreign currency translation — (2 ) — (2 ) December 31, 2019 43 117 2 162 Business combination 38 111 — 149 Foreign currency translation 10 9 — 19 December 31, 2020 91 237 2 330 As described in Note 7, the 2020 acquisitions resulted in the recognition of $135 million in goodwill which has been included in the ADG and MDG segments to align the goodwill of the acquired businesses with the segments for which the related activities are reported. In addition, changes in the carrying amount of goodwill in 2020 include $14 million increase related to the acquisition of Norstel following finalization of the purchase price allocation in 2020. Goodwill as at December 31, 2020 and 2019 is net of accumulated impairment losses of $102 million, of which $96 million relates to the MDG segment and $6 million to Others. In 2020, 2019 and 2018, no impairment loss was recorded by the Company.

Other Intangible Assets, Net

Other Intangible Assets, Net	12 Months Ended
Other Intangible Assets, Net	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Other Intangible Assets, Net	9. OTHER INTANGIBLE ASSETS, NET Other intangible assets, net consisted of the following: December 31, 2020 Gross Cost Accumulated Amortization Net Cost Technologies & licenses 934 (623 ) 311 Purchased & internally developed software 537 (461 ) 76 Technologies in progress 56 — 56 Other intangible assets 72 (70 ) 2 Total 1,599 (1,154 ) 445 December 31, 2019 Gross Cost Accumulated Amortization Net Cost Technologies & licenses 699 (578 ) 121 Purchased & internally developed software 486 (427 ) 59 Technologies in progress 119 — 119 Other intangible assets 70 (70 ) — Total 1,374 (1,075 ) 299 As described in Note 7, the acquisitions completed in 2020 resulted in the recognition of technologies of $108 million, reported on the line “Technologies & licenses”, $10 $2 Furthermore, the 2019 acquisition of Norstel resulted in the recognition of technology in progress for $86 million reported on the line “Technologies in progress” as at December 31, 2019. The acquired technology was reported on the line “Technologies & licenses” as at December 31, 2020. The line “Technologies in progress” in the table above also includes internally developed software under construction and software not ready for use. The amortization expense in 2020, 2019 and 2018 was $79 million, $69 million and $64 million, respectively. The estimated amortization expense of the existing intangible assets for the following years is: Year 2021 97 2022 82 2023 64 2024 49 2025 35 Thereafter 118 Total 445 In 2020, 2019 and 2018, the Company impaired $4 million, $4 million and $2 million, respectively, of acquired licenses and technologies for which it was determined that they had no alternative future use.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
Property, Plant and Equipment, Net	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	10. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net consisted of the following: December 31, 2020 Gross Cost Accumulated Depreciation Net Cost Land 86 — 86 Buildings 995 (567 ) 428 Facilities & leasehold improvements 3,545 (3,038 ) 507 Machinery and equipment 16,689 (13,859 ) 2,830 Computer and R&D equipment 402 (347 ) 55 Operating lease right-of-use assets 290 (99 ) 191 Other tangible assets 118 (99 ) 19 Construction in progress 480 — 480 Total 22,605 (18,009 ) 4,596 December 31, 2019 Gross Cost Accumulated Depreciation Net Cost Land 78 — 78 Buildings 905 (505 ) 400 Facilities & leasehold improvements 3,193 (2,762 ) 431 Machinery and equipment 15,336 (12,790 ) 2,546 Computer and R&D equipment 382 (335 ) 47 Operating lease right-of-use assets 266 (60 ) 206 Other tangible assets 110 (93 ) 17 Construction in progress 282 — 282 Total 20,552 (16,545 ) 4,007 The line “Construction in progress” in the table above includes property, plant and equipment under construction and equipment under qualification before operating and not ready for their intended use. The depreciation charge was $844 million, $785 million and $727 million in 2020, 2019 and 2018, respectively. Tax incentives and capital investment funding, which reduced property, plant and equipment totaled $10 million, $54 million and $149 million for the years ended December 31, 2020, 2019 and 2018, respectively. Tax incentives and public funding reduced depreciation charges by $59 million, $53 million and $42 million in 2020, 2019 and 2018, respectively. For the years ended December 31, 2020, 2019 and 2018 the Company sold property, plant and equipment for cash proceeds of $4 million, $7 million and $1 million, respectively. There was no impairment recognized for the years ended December 31, 2020 and 2018. For the year ended December 31, 2019, the Company recorded impairment charges of $3 million on long-lived assets.

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2020
Lessee Disclosure [Abstract]
Leasing	11. LEASES A lease contract is a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use assets within plant, property and equipment. Current operating lease liabilities are included in other payables and accrued liabilities, while noncurrent operating lease liabilities are included in other long-term liabilities in the Company’s consolidated balance sheet. Finance leases are included in property and equipment and long-term debt. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The right-of-use asset is a nonmonetary asset while the lease liability is a monetary liability . When accounting for a lease that is denominated in a foreign currency, the lease liability is remeasured using the current exchange rate, while the right-of-use asset is remeasured using the exchange rate as of the commencement date. The Company leases land, buildings, cars and certain equipment (including IT equipment) which have remaining lease terms between less than one year and 49 years. Certain lease contracts contain options to extend the leases by up to 30 years, which the Company has included in the lease term when it is reasonably certain for the Company to exercise that option. In addition, the Company made an accounting policy election for all the asset classes to not account for short-term leases. A short-term lease is defined as a lease that, at the commencement date, has a lease term of 12 months or less and does not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise. The short-term lease election can only be made at the commencement date. Variable lease payments that depend on an index or a rate are included in the lease payments and are measured using the prevailing index or rate at the measurement date (January 1, 2019 for initial measurement of the leases existing at that date and commencement date for subsequent lease contracts). Changes to index and rate-based variable lease payments are recognized in profit or loss in the period of the change. In addition, lease contracts with a sum of lease payments not exceeding $5,000 have been excluded from the capitalization in the consolidated balance sheet. Certain assumptions and judgements may be made in applying the requirements of lease accounting, such as the exercise of extension options and determination of discount rates. Discount rates The rate implicit in the lease should be used whenever that rate is readily determinable. In most cases, this rate is not readily determinable and the Company used its incremental borrowing rate, which was derived from information available at the lease commencement date, in determining the present value of lease payments. The Company gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. Due to immateriality of any intra-quarter discount rate changes, the Company determines the discount rate based on the mid-quarter date. Most leases entered into by the Company are operating leases. A s at December 31, 2020 and December 31, 2019, finance lease right-of-use assets were less than $1 million. The below information is presented for operating leases only. Operating leases consisted of the following: December 31, 2020 December 31, 2019 Assets Right-of-use assets 191 206 Total right-of-use assets 191 206 Lease liabilities Current 54 55 Non-current 142 152 Total lease liabilities 196 207 Maturities of operating lease liabilities are as follows: December 31, 2020 2021 58 2022 44 2023 32 2024 21 2025 13 Thereafter 76 Total future undiscounted cash outflows 244 Effect of discounting (48 ) Total operating lease liabilities 196 Operating lease term and discount rate are as follows: December 31, 2020 December 31, 2019 Weighted average remaining lease term (in years) 9.01 9.26 Weighted average discount rate 2.71 % 2.79 % Operating lease cost and cash paid are as follows: 2020 2019 Operating lease cost 65 65 Operating lease cash paid 65 65 Right-of-use assets obtained in exchange for new operating lease liabilities are as follows: 2020 2019 Operating leases 40 38

Long-Term Investments

Long-Term Investments	12 Months Ended
Long-Term Investments	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Long-Term Investments	12. LONG-TERM INVESTMENTS December 31, 2020 December 31, 2019 Long-term investments 10 11 Total 10 11 Long-term investments are equity securities with no readily determinable fair value for which the Company has elected to apply the cost alternative measurement. It includes principally the Company’s investment in DNP Photomask Europe S.p.A (“DNP”). The Company has identified DNP as a VIE, but has determined that it is not the primary beneficiary. The significant activities of DNP revolve around the creation of masks and development of high level mask technology. The Company does not have the power to direct such activities. The Company’s current maximum exposure to losses as a result of its involvement with DNP is limited to its investment. The Company has not provided additional financial support in 2020 and 2019 and currently has no requirement or intent to provide further financial support to DNP.

Other Non-Current Assets

Other Non-Current Assets	12 Months Ended
Other Non-Current Assets	Dec. 31, 2020
Investments All Other Investments [Abstract]
Other Non-Current Assets	13. OTHER NON-CURRENT ASSETS Other non-current assets consisted of the following: December 31, December 31, 2020 2019 Equity securities 25 23 Long-term State receivables 623 358 Deposits and other non-current assets 76 56 Total 724 437 Long-term State receivables include receivables related to funding and receivables related to tax refunds. Funding are mainly public grants to be received from governmental agencies in Italy and France as part of long-term research and development, industrialization and capital investment projects. Long-term receivables related to tax refund correspond to tax benefits claimed by the Company in certain of its local tax jurisdictions, for which collection is expected beyond one year. In 2020 and 2019, the Company entered into factoring transactions to accelerate the realization in cash of some non-current assets. As at December 31, 2020, $96 million of the non-current assets were sold without recourse, compared to $131 million as at December 31, 2019, with a financial cost of less than $1 million for both years. The major portion of other non-current assets to which the ASC 326 new expected credit loss model applies are long-term State receivables. Due to the existing history of zero-default on receivables originated by governments, the expected credit losses are assumed to be negligible at January 1, 2020 and December 31, 2020. Other non-current assets presented in the table above within the line "Deposits and other non-current assets" are composed of individually insignificant amounts not deemed to have exposure of default. Consequently, no significant loss allowance was reported on other non-current assets as at ASC 326 new guidance adoption date and reporting date.

Other Payables and Accrued Liab

Other Payables and Accrued Liabilities	12 Months Ended
Other Payables and Accrued Liabilities	Dec. 31, 2020
Payables And Accruals [Abstract]
Other Payables and Accrued Liabilities	14. OTHER PAYABLES AND ACCRUED LIABILITIES Other payables and accrued liabilities consisted of the following: December 31, 2020 December 31, 2019 Employee related liabilities 467 375 Employee compensated absences 164 138 Taxes other than income taxes 58 53 Advances 75 63 Derivative instruments 2 7 Provision for restructuring 4 10 Defined benefit plans – current portion 9 10 Defined contribution plans – accrued benefits 23 20 Other long-term employee benefits – current portion 4 7 Royalties 24 21 Current lease liabilities 54 55 Deferred consideration for business combinations — 10 Others 82 62 Total 966 831 Derivative instruments are further described in Note 28. Other payables and accrued liabilities include individually insignificant amounts as at December 31, 2020 and December 31, 2019, presented cumulatively in line “Others”.

Long-Term Debt

Long-Term Debt	12 Months Ended
Long-Term Debt	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-Term Debt	15. LONG-TERM DEBT Long-term debt consisted of the following: December 31, December 31, 2020 2019 Funding program loans from European Investment Bank: 1.36% due 2020, floating interest rate at Libor + 1.099% — 13 1.20% due 2020, floating interest rate at Libor + 0.956% — 28 0.37% due 2020, floating interest rate at Euribor + 0.817% — 14 0.77% due 2021, floating interest rate at Libor + 0.525% 30 60 0.83% due 2021, floating interest rate at Libor + 0.572% 29 58 0.09% due 2028, floating interest rate at Euribor + 0.589% 250 258 0.22% due 2029, floating interest rate at Euribor + 0.564% 270 275 Dual tranche senior unsecured convertible bonds Zero-coupon, due 2022 (Tranche A) — 700 0.25% due 2024 (Tranche B) 674 654 Zero-coupon, due 2025 (Tranche A) 703 — Zero-coupon, due 2027 (Tranche B) 661 — Other funding program loans: 0.48% (weighted average), due 2021-2028, fixed interest rate 4 12 Total long-term debt 2,621 2,072 Less current portion (795 ) (173 ) Total long-term debt, less current portion 1,826 1,899 Long-term debt is denominated in the following currencies: December 31, 2020 December 31, 2019 U.S. dollar 2,097 1,513 Euro 524 559 Total 2,621 2,072 On July 3, 2017, the Company issued a $1.5 billion principal amount of dual tranche senior unsecured convertible bonds (Tranche A and Tranche B for $750 million each tranche), due 2022 and 2024, respectively. Tranche A bonds were issued at 101.265% as zero-coupon bonds, while Tranche B bonds were issued at par and bear a 0.25% per annum nominal interest, payable semi-annually. The conversion price at issuance was $20.54, equivalent to a 37.5% premium on both tranches, which corresponds to 9,737 equivalent shares per each $200,000 bond par value. The bonds are convertible by the bondholders or are callable by the issuer upon certain conditions, on a net-share settlement basis, except if the issuer elects a full-cash or full-share conversion as an alternative settlement. The net proceeds from the bond offering were $1,502 million, after deducting issuance costs payable by the Company. Proceeds were allocated between debt and equity by measuring first the liability component and then determining the equity component as a residual amount. The liability component was measured at fair value based on a discount rate adjustment technique (income approach), which corresponded to a Level 3 fair value hierarchy measurement. The fair value of the liability component at initial recognition totaled $1,266 million before allocation of issuance costs, and was estimated by calculating the present value of cash flows using a discount rate of 2.70% and 3.28% (including 0.25% per annum nominal interest), respectively, on each tranche, which were determined to be consistent with the market rates at the time for similar instruments with no conversion rights. An amount of $242 million, net of allocated issuance costs of $1 million, was recorded in equity as the value of the conversion features of the instruments. The call option available to the Company for the early redemption of Tranche A was exercised in July 2020. As a consequence, bondholders exercised their conversion rights on Tranche A. As the Company elected to net share settle the bonds, each conversion exercised by the bondholders followed the process defined in the original terms and conditions of the senior unsecured convertible bonds, which determined the actual number of shares to be transferred upon each conversion. The Company settled the bonds upon conversion, by redeeming through cash the $750 million principal amount, and by settling the residual consideration through the delivery of 11.4 million treasury shares. The net-share settlement was completed as of October 1, 2020. The Company allocated the total consideration transferred between debt and equity by measuring at fair value the liability component of Tranche A prior to settlement, then determining the equity component as a residual amount. The liability component was measured at fair value based on a discount rate adjustment technique (income approach), which corresponded to a Level 3 fair value hierarchy measurement and consisted in calculating the present value of cash flows using an average estimated discount rate of 0.8%, which fairly approximated current market rates for similar bonds with no conversion rights. The fair value of the liability component as measured prior to extinguishment was $739 million for Tranche A, which generated a loss amounting to $25 million reported on the line “Loss on financial instruments, net” in the consolidated statement of income for the year ended December 31, 2020. In line with the contractual terms of the convertible bonds, bondholders will have full conversion rights on Tranche B, with original maturity in 2024, starting July 26, 2021. Therefore, the liability component of Tranche B was classified as short-term debt on the consolidated balance sheet as at December 31, 2020. On August 4, 2020, the Company issued a $1.5 billion principal amount of dual tranche senior unsecured convertible bonds (Tranche A and Tranche B for $750 million each tranche), due 2025 and 2027, respectively. Tranche A bonds were issued at 105.8% as zero-coupon bonds while Tranche B bonds were issued at 104.5% as zero-coupon bonds. The conversion price at issuance was $43.62 for Tranche A equivalent to a 47.5% conversion premium and $45.10 for Tranche B, equivalent to a 52.5% conversion premium. These conversion features correspond to an equivalent of 4,585 shares per each Tranche A bond $200,000 par value and an equivalent of 4,435 shares per each Tranche B bond $200,000 par value. The bonds are convertible by the bondholders or are callable by the issuer upon certain conditions, on a net-share settlement basis, except if the issuer elects a full-cash or full-share conversion as an alternative settlement. The net proceeds from the bond offering were $1,567 million, after deducting issuance costs paid by the Company. Proceeds were allocated between debt and equity by measuring first the liability component and then determining the equity component as a residual amount. The liability component was measured at fair value based on a discount rate adjustment technique (income approach), which corresponded to a Level 3 fair value hierarchy measurement. The fair value of the liability component at initial recognition totaled $1,362 million before allocation of issuance costs and deferred tax effect, and was estimated by calculating the present value of cash flows using a discount rate of 1.30% and 1.85%, respectively, on each tranche, which were determined to be consistent with the market rates at the time for similar instruments with no conversion rights. An amount of $215 million, before allocation of $1 million issuance costs and $30 million deferred tax effect, was recorded in equity as the value of the conversion features of the instruments. Unamortized debt discount and issuance costs on the issued convertible debt totaled $212 million as at December 31, 2020. As at December 31, 2020, the Company stock price exceeded the conversion price of Tranche B of the senior unsecured convertible bonds issued on July 3, 2017 and did not exceed the conversion price of the senior unsecured convertible bonds issued on August 4, 2020. Aggregate future maturities of total long-term debt (including current portion) at principal amount are as follows: December 31, 2020 2021 121 2022 62 2023 62 2024 812 2025 812 Thereafter 965 Total 2,834 The difference between the total aggregated future maturities in the preceding table and the total carrying amount of long-term debt is due to unamortized debt discount and issuance costs on the dual tranche senior unsecured convertible bonds. Credit facilities The Company’s long-term debt contained standard conditions but does not impose minimum financial ratios. , including a €500 million long-term line signed with the EIB in the first quarter of 2020, undrawn as at December 31, 2020. Out of the €500 million undrawn as at December 31, 2020, an amount of €335 million was drawn in February 2021. The Company also had three long-term amortizing credit facilities with the European Investment Bank as part of R&D funding programs. The first one, signed on September 27, 2010, a €350 million multi-currency loan for R&D programs in Europe, was drawn mainly in U.S. dollars for an amount of $321 million and only partially in Euros for an amount of €100 million. The outstanding amount as at December 31, 2019 was fully repaid in 2020. The second one, signed on March 12, 2013, a €350 million multi-currency loan which also supported R&D programs, was drawn in U.S. dollars for $471 million, of which $59 million was outstanding as at December 31, 2020. The third one, signed in August 2017 amounted to €500 million, in relation to R&D and capital expenditures in the European Union for the years 2017 and 2018. The entire amount was fully drawn in Euros corresponding to $520 million outstanding as at December 31, 2020.

Post-Employment and Other Long-

Post-Employment and Other Long-Term Employees Benefits	12 Months Ended
Post-Employment and Other Long-Term Employees Benefits	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Post-Employment and Other Long-Term Employees Benefits	1 6 . POST-EMPLOYMENT AND OTHER LONG-TERM EMPLOYEES BENEFITS The Company and its subsidiaries have a number of defined benefit pension plans, mainly unfunded, and other long-term employees’ benefits covering employees in various countries. The defined benefit plans provide pension benefits based on years of service and employee compensation levels. The other long-term employees’ plans provide benefits due during the employees’ period of service after certain seniority levels. The Company uses December 31 as measurement date for its plans. Eligibility is generally determined in accordance with local statutory requirements. For Italian termination indemnity plan (“TFR”), generated before July 1, 2007, the Company measures the vested benefits to which Italian employees are entitled as if the amounts were immediately due as at December 31, 2020, in compliance with U.S. GAAP guidance on determining vested benefit obligations for defined benefit pension plans. The changes in benefit obligation and plan assets were as follows: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Change in benefit obligation: Benefit obligation at beginning of year 1,036 911 88 81 Service cost 31 27 11 5 Interest cost 21 24 1 1 Employee contributions 4 3 — — Plan amendments 1 1 — — Benefits paid (13 ) (15 ) (11 ) (4 ) Effect of curtailment — — — — Effect of settlement (2 ) (36 ) — — Actuarial (gain) loss 83 117 3 6 Foreign currency translation adjustment 55 4 9 (1 ) Benefit obligation at end of year 1,216 1,036 101 88 Change in plan assets: Plan assets at fair value at beginning of year 597 527 — — Actual return on plan assets 84 81 — — Employer contributions 17 21 — — Employee contributions 4 3 — — Benefits paid (3 ) (5 ) — — Effect of settlement — (36 ) — — Foreign currency translation adjustments 19 6 — — Plan assets at fair value at end of year 718 597 — — Funded status (498 ) (439 ) (101 ) (88 ) The actuarial losses incurred during 2020 were primarily due to a decrease in discount rates applied against future expected benefit payments and resulted in an increase of the benefit obligation mainly for the plans located in the United Kingdom and in the United States. Net amount recognized in the consolidated balance sheets consisted of the following: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Non-current assets 4 4 — — Current liabilities (9 ) (10 ) (4 ) (7 ) Long-term liabilities (493 ) (433 ) (97 ) (81 ) Net amount recognized (498 ) (439 ) (101 ) (88 ) The components of accumulated other comprehensive loss (income) before tax effects were as follows: Actuarial (gains)/losses Prior service cost Total Accumulated other comprehensive loss as at December 31, 2018 152 3 155 Net amount generated/arising in current year 57 1 58 Amortization (13 ) (1 ) (14 ) Foreign currency translation adjustment 1 — 1 Accumulated other comprehensive loss as at December 31, 2019 197 3 200 Net amount generated/arising in current year 21 1 22 Amortization (13 ) (1 ) (14 ) Foreign currency translation adjustment 11 — 11 Accumulated other comprehensive loss as at December 31, 2020 216 3 219 The accumulated benefit obligations were as follows: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Accumulated benefit obligations 1,053 896 83 74 For pension plans and other long-term benefits with accumulated benefit obligations in excess of plan assets, the accumulated benefit obligation and fair value of plan assets were $773 million and $327 million, respectively, as at December 31, 2020 and $952 million and $562 million, respectively, as at December 31, 2019. For pension plans with projected benefit obligations in excess of plan assets, the benefit obligation and fair value of plan assets were $1,177 million and $675 million, respectively, as at December 31, 2020 and $1,005 million and $562 million, respectively, as at December 31, 2019. The components of the net periodic benefit cost included the following: Pension Benefits Other Long-term Benefits Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Service cost 31 27 27 11 5 6 Interest cost 21 24 24 1 1 1 Expected return on plan assets (23 ) (22 ) (23 ) — — — Amortization of actuarial net loss (gain) 12 10 8 3 7 1 Amortization of prior service cost 1 1 1 — — — Effect of settlement 1 3 — — — — Effect of curtailment — — 1 — — — Net periodic benefit cost 43 43 38 15 13 8 Pension benefits components other than service cost, recognized outside of Operating income in “Other components of pension benefit costs” in the Company’s consolidated statements of income, were $12 million, $16 million and $11 million in the years ended December 31, 2020, 2019 and 2018, respectively. The weighted average assumptions used in the determination of the benefit obligation and the plan assets for the pension plans and the other long-term benefits were as follows: Assumptions 2020 2019 Discount rate 1.45 % 1.95 % Salary increase rate 2.43 % 2.48 % Expected long-term rate of return on funds for the pension expense of the following year 3.44 % 4.04 % The weighted average assumptions used in the determination of the net periodic benefit cost for the pension plans and the other long-term benefits were as follows: Assumptions 2020 2019 2018 Discount rate 1.95 % 2.75 % 2.54 % Salary increase rate 2.48 % 2.32 % 2.37 % Expected long-term rate of return on funds for the pension expense of the year 4.04 % 4.16 % 4.23 % The discount rate was determined by reference to market yields on high quality long-term corporate bonds applicable to the respective country of each plan, with terms consistent with the terms of the benefit obligations concerned. In developing the expected long-term rate of return on assets, the Company modelled the expected long-term rates of return for broad categories of investments held by the plan against a number of various potential economic scenarios. The Company’s pension plan asset allocation at December 31, 2020 and at December 31, 2019 is as follows: Percentage of Plan Assets at December Asset Category 2020 2019 Cash and cash equivalents 1 % 1 % Equity securities 23 % 24 % Government debt securities 12 % 12 % Corporate debt securities 15 % 16 % Investments in funds (a) 21 % 21 % Real estate 2 % 2 % Other (mainly insurance assets – contracts and reserves) 26 % 24 % Total 100 % 100 % (a) As at December 31, 2020, investments in funds were composed of commingled and multi-strategy funds invested in diversified portfolios of fixed income ( 72 %) - mainly corporate bonds, equity ( 13 ), other instruments (15 % ). As at December 31, 2019, investments in funds were composed of commingled and multi-strategy funds invested in diversified portfolios of corporate bonds (37%), government bonds (32%), equity (15%) and other instruments (16%). As at December 31, 2020, the Company’s plan asset allocation was in line with the targets set for each plan. The Company’s detailed pension plan asset allocation including the fair-value measurements of those plan assets as at December 31, 2020 is as follows: Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents 4 4 — — Equity securities 167 2 165 — Government debt securities 86 — 86 — Corporate debt securities 105 — 81 24 Investment funds 153 3 150 — Real estate 11 — 11 — Other (mainly insurance assets – contracts and reserves) 192 — 54 138 TOTAL 718 9 547 162 The Company’s detailed pension plan asset allocation including the fair-value measurements of those plan assets as at December 31, 2019 is as follows: Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents 5 5 — — Equity securities 144 1 143 — Government debt securities 74 — 74 — Corporate debt securities 95 — 83 12 Investment funds 127 1 126 — Real estate 10 — 10 — Other (mainly insurance assets – contracts and reserves) 142 — 41 101 TOTAL 597 7 477 113 The fair value of insurance contracts is based on the value of the assets held by the provider. The approach is consistent with prior years. For plan assets measured at fair value using significant unobservable inputs (Level 3), the reconciliation between January 1, 2020 and December 31, 2020 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2020 113 Contributions (employer and employee) 14 Actual return on plan assets 2 Net benefit payments (a) 11 Settlements — Transfer in Level 3 10 Foreign currency translation adjustment 12 December 31, 2020 162 ( a ) For plan assets measured at fair value using significant unobservable inputs (Level 3), the reconciliation between January 1, 2019 and December 31, 2019 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2019 117 Contributions (employer and employee) 11 Actual return on plan assets (1 ) Net benefit payments (a) 9 Settlements (34 ) Transfer in Level 3 11 December 31, 2019 113 ( a ) The Company’s investment strategy for its pension plans is to optimize the long-term investment return on plan assets in relation to the liability structure to maintain an acceptable level of risk while minimizing the cost of providing pension benefits and maintaining adequate funding levels in accordance with applicable rules in each jurisdiction. The Company’s practice is to periodically conduct a review of its asset allocation strategy, in such a way that the asset allocation is in line with the targeted asset allocation within reasonable boundaries. The Company’s asset portfolios are managed in such a way as to achieve adapted diversity. The Company does not manage any assets internally. After considering the funded status of the Company’s defined benefit plans, movements in the discount rate, investment performance and related tax consequences, the Company may choose to make contributions to its pension plans in any given year in excess of required amounts. The Company’s contributions to plan assets were $17 million in 2020 and $21 million in 2019 and the Company expects to contribute $22 million to plan assets in 2021. The Company’s estimated future benefit payments as at December 31, 2020 are as follows: Years Pension Benefits Other Long-term Benefits 2021 38 5 2022 30 5 2023 40 6 2024 51 9 2025 56 9 From 2026 to 2030 298 49 The Company has certain defined contribution plans, which accrue benefits for employees on a pro-rata basis during their employment period based on their individual salaries. The Company’s accrued benefits related to defined contribution pension plans for $23 million as at December 31, 2020 and $20 million as at December 31, 2019. The annual cost of these plans amounted to approximately $ 91

Other Long-Term Liabilities

Other Long-Term Liabilities	12 Months Ended
Other Long-Term Liabilities	Dec. 31, 2020
Other Liabilities Noncurrent [Abstract]
Other Long-Term Liabilities	17. Other long-term liabilities consisted of the following: December 31, 2020 December 31, 2019 Non-current lease liabilities 142 152 Contingent consideration on business combinations 123 — Deferred consideration 20 — Other long-term employee benefits 97 81 Long-term liability related to public funding 42 47 Provision for restructuring — 1 Others 64 49 Total 488 330 Lease liabilities are further described in Note 11. The Company reported deferred and contingent consideration related to business acquisitions totalling $143 million as at December 31, 2020, which are further described in Note 7. Other long-term employee benefits are further described in Note 16. Long-term liability related to public funding corresponded to grants received mainly as part of the Nano2017 program with the French government, which is subject to a financial return and depends on future cumulative sales. Public funding is further described in Note 21. Other long-term liabilities also include individually insignificant amounts as at December 31, 2020 and December 31, 2019, presented cumulatively in the line “Others”.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2020
Federal Home Loan Banks [Abstract]
Shareholders' Equity	1 8 . SHAREHOLDERS’ EQUITY 1 8 .1 Outstanding shares The authorized share capital of the Company is Euro 1,810 million consisting of 1,200,000,000 common shares and 540,000,000 preference shares, each with a nominal value of €1.04. As at December 31, 2020 the number of shares of common stock issued was 911,239,420 shares (911,186,920 at December 31, 2019). As at December 31, 2020, the number of shares of common stock outstanding was 905,415,002 (891,434,489 at December 31, 2019). 1 8 .2 Preference shares The 540,000,000 preference shares, when issued, will entitle a holder to full voting rights and to a preferential right to dividends and distributions upon liquidation. The Company is a party to an option agreement regarding the preference shares with Stichting Continuïteit ST (the “Stichting”), entered into on January 22, 2007, with a duration of ten years, which agreement was extended for another ten years in October 2016. The Managing Board and Supervisory Board, along with the board of the Stichting, have declared that they are jointly of the opinion that the Stichting is independent of the Company. The option agreement provides for the issuance of up to a maximum 540,000,000 preference shares. Any such shares would be issued to the Stichting upon its request and in its sole discretion and upon payment of at least 25% of the par value of the preference shares to be issued. The shares would be issuable in the event of actions which the board of the Stichting determines would be contrary to the Company’s interests, shareholders and other stakeholders and which in the event of a creeping acquisition or offer for the Company’s common shares are not supported by the Company’s Managing Board and Supervisory Board. The preference shares may remain outstanding for no longer than two years. The effect of the preference shares may be to deter potential acquirers from effecting an unsolicited acquisition resulting in a change of control as well as to create a level-playing field in the event actions which are considered to be hostile by the Company’s Managing Board and Supervisory Board, as described above, occur and which the board of the Stichting determines to be contrary to the Company’s interests , shareholders and other stakeholders. There were no preference shares issued as at December 31, 2020 and December 31, 2019 respectively. 18.3 Treasury stock As at December 31, 2020, the Company owned 5,824,418 shares classified as treasury stock in the consolidated statement of equity compared to 19,752,431 shares as at December 31, 2019. The treasury shares have been originally designated for allocation under the Company’s share-based remuneration programs. As at December 31, 2020, 60,484,598 of these treasury shares were transferred to employees under the Company’s share-based remuneration programs, of which 7,260,486 in the year ended December 31, 2020. On November 5, 2018, the Company announced a three years buy-back program of up to $750 million. During 2020, the Company repurchased 4.8 million shares of its common stock for a total of $125 million under the share buy-back program, reflected at cost, as a reduction of the parent company stockholders’ equity. As described in Note 15, bondholders exercised in 2020 their conversion rights on Tranche A of the . The full settlement of Tranche A resulted in 11.4 million shares delivered to bondholders and 1 8 .4 Unvested share awards for the Supervisory Board On an annual basis and until the year 2012, the Compensation Committee (on behalf of the Supervisory Board and with its approval) used to grant stock-based awards (options to acquire common shares of the Company) to the members and professionals of the Supervisory Board (“The Supervisory Board Plan”). The awards were granted at the nominal value of the share of €1.04 (exercise price of the option). The options granted under the Supervisory Board Plan vest and become exercisable immediately, while the shares resulting from these awards vest and therefore become available for trade evenly over three years (one third every year), with no market, performance or service conditions. The table below summarizes grants under the outstanding stock award plans, as authorized by the Compensation Committee: Year of grant Options granted and vested Options waived at grant 2010 172,500 (7,500 ) 2011 172,500 (30,000 ) 2012 180,000 (22,500 ) 2013 to 2020 No options granted A summary of the options’ activity by plan for the years ended December 31, 2020 and December 31, 2019 is presented below: Year of grant Outstanding as of December 31, 2018 Exercised Expired / Cancelled Outstanding as of December 31, 2019 Exercised Expired / Cancelled Outstanding as of December 31, 2020 2010 22,500 (22,500 ) — — — — — 2011 52,500 (7,500 ) — 45,000 (37,500 ) — 7,500 2012 65,000 — — 65,000 (15,000 ) — 50,000 The total intrinsic value of options exercised during the year 2020 amounted to $2 million, compared to $1 million in 2019 and 2018. The total intrinsic value of options outstanding as at December 31, 2020 and December 31, 2019 amounted to $2 million and $3 million, respectively. At the Company’s Annual General Meeting of Shareholders held on June 21, 2013, it was resolved to abolish and terminate the stock-based compensation for the Supervisory Board members and professionals. 1 8 .5 Unvested share awards for the employees On an annual basis, the Compensation Committee (on behalf of the Supervisory Board and with its approval) grants stock-based awards to the senior executives along with selected employees (the “Employee Plan”). The awards are granted for services under the Employee Plan. There are two types of unvested shares: (1) shares granted to employees, which are subject only to service conditions and vest over the requisite service period, and (2) shares granted to senior executives, whose vesting is subject to performance conditions. For the plans 2017, 2018, 2019 and 2020, the performance conditions consisted of two external targets (sales evolution and operating income compared to a basket of competitors) weighting for two thirds of the total number of awards granted and of one internal target (return on net assets compared to the previous period), weighting for one third of the total number of awards granted. All the awards vest over a three-year The table below summarizes grants under the outstanding stock award plans in 2020, as authorized by the Compensation Committee: Date of grant Plan name Number of shares granted Number of shares waived Number of shares lost on performance conditions July 25, 2017 2017 Employee Plan 7,634,475 — — December 22, 2017 2017 Employee Plan 347,160 — — July 24, 2018 2018 Employee Plan 7,552,410 — — December 20, 2018 2018 Employee Plan 443,200 — — May 23, 2019 2019 CEO Special Bonus 34,960 — — July 24, 2019 2019 Employee Plan 7,752,940 — (1,161,966 ) December 26, 2019 2019 Employee Plan 246,750 — (17,013 ) July 23, 2020 2020 Employee Plan 7,437,580 — () December 24, 2020 2020 Employee Plan 562,350 — () (*) As at December 31, 2020, a final determination of the achievement of the performance conditions had not yet been made by the Compensation Committee of the Supervisory Board. A summary of the unvested share activity by plan for the year ended December 31, 2020 is presented below: Unvested Shares Unvested as at December 31, 2019 Granted Forfeited / waived Cancelled on failed vesting conditions Vested Unvested as at December 31, 2020 2017 Employee Plan 2,648,379 — (14,634 ) — (2,633,745 ) — 2018 Employee Plan 5,197,924 — (36,912 ) — (2,442,327 ) 2,718,685 2019 CEO Special Bonus — 34,960 — — (11,654 ) 23,306 2019 Employee Plan 7,977,370 — (51,111 ) (1,178,979 ) (2,172,160 ) 4,575,120 2020 Employee Plan — 7,999,930 (28,385 ) — (600 ) 7,970,945 Total 15,823,673 8,034,890 (131,042 ) (1,178,979 ) (7,260,486 ) 15,288,056 The grant date weighted average fair value of unvested shares granted to employees under the 2017 Employee Plan was $16.52. On March 27, 2018, the Compensation Committee approved the statement that with respect to the shares subject to performance conditions, all three performance conditions were fully met. Consequently, the compensation expense recorded on the 2017 Employee Plan reflected the statement that – for the portion of shares subject to performance conditions – 100% of the awards granted would fully vest, as far as the service condition is met. The grant date weighted average fair value of unvested shares granted to employees under the 2018 Employee Plan was $22.78. On March 27, 2019, the Compensation Committee approved the statement that with respect to the shares subject to performance conditions, all three performance conditions were fully met. Consequently, the compensation expense recorded on the 2018 Employee Plan reflects the statement that – for the portion of shares subject to performance conditions – 100% of the awards granted will fully vest, as far as the service condition is met. The grant date fair value of unvested shares granted to the CEO under the 2019 CEO Special Bonus Plan was $14.97. On the 2019 CEO Special Bonus Plan, the fair value of the unvested shares granted reflected the market price of the shares at the date of the grant. The grant date weighted average fair value of unvested shares granted to employees under the 2019 Employee Plan was $19.28. On March 25, 2020, the Compensation Committee approved the statement that with respect to the shares subject to performance conditions, two performance conditions were fully met. Consequently, the compensation expense recorded on the 2019 Employee Plan reflects the statement that – for the portion of shares subject to performance conditions – two thirds The grant date weighted average fair value of unvested shares granted to employees under the 2020 Employee Plan was $30.17. Moreover, for the portion of the shares subject to performance conditions (3,605,365 shares) the Company estimated the number of awards expected to vest by assessing the probability of achieving the performance conditions. As at December 31, 2020, a final determination of the achievement of the performance conditions had not been made yet by the Compensation Committee of the Supervisory Board. The Company estimated that two thirds of the awards subject to performance conditions were expected to vest. Consequently, the compensation expense recorded for the 2020 Employee Plan reflects the vesting of the two thirds The following table illustrates the classification of pre-payroll tax and social contribution stock-based compensation expense included in the consolidated statements of income for the years ended December 31, 2020, December 31, 2019 and December 31, 2018: December 31, 2020 December 31, 2019 December 31, 2018 Cost of sales 25 22 23 Selling, general and administrative 51 46 67 Research and development 79 77 35 Total pre-payroll tax and social contribution compensation 155 145 125 The fair value of the shares that vested in 2020 was $141 million compared to $114 million in 2019 and $68 million in 2018. Compensation cost, excluding payroll tax and social contribution, capitalized as part of inventory was $6 million as at December 31, 2020, compared to $6 million 2019 and $6 million as at December 31, 2018. As at December 31, there was $182 million of total unrecognized compensation cost related to the grant of unvested shares, which is expected to be recognized over a weighted average period of approximately 9 months The total deferred income tax benefit recognized in the consolidated statements of income related to unvested share-based compensation expense amounted to $10 million, $9 million and $7 million for the years ended December 31, 2020, 2019 and 2018, respectively. 1 8 .6 Accumulated other comprehensive income (loss) attributable to parent company stockholders The table below details the changes in AOCI attributable to the company’s stockholders by component, net of tax, for the years ended December 31, 2020, 2019 and 2018: Gains (Losses) on Cash Flow Hedges Gains (Losses) on Available- For-Sale Securities Defined Benefit Pension Plan Items Foreign Currency Translation Adjustments (“CTA”) Total December 31, 2017 45 — (166 ) 768 647 Cumulative tax impact — — 41 — 41 December 31, 2017, net of tax 45 — (125 ) 768 688 OCI before reclassifications (83 ) (2 ) (24 ) (87 ) (196 ) Amounts reclassified from AOCI (1 ) — 11 — 10 OCI for the year ended December 31, 2018 (84 ) (2 ) (13 ) (87 ) (186 ) Cumulative tax impact 4 — 3 — 7 OCI for the year ended December 31, 2018, net of tax (80 ) (2 ) (10 ) (87 ) (179 ) December 31, 2018 (39 ) (2 ) (179 ) 681 461 Cumulative tax impact 4 — 44 — 48 December 31, 2018, net of tax (35 ) (2 ) (135 ) 681 509 OCI before reclassifications (43 ) 3 (58 ) (35 ) (133 ) Amounts reclassified from AOCI 79 — 14 — 93 OCI for the year ended December 31, 2019 36 3 (44 ) (35 ) (40 ) Cumulative tax impact (4 ) — 10 — 6 OCI for the year ended December 31, 2019, net of tax 32 3 (34 ) (35 ) (34 ) December 31, 2019 (3 ) 1 (223 ) 646 421 Cumulative tax impact — — 54 — 54 December 31, 2019, net of tax (3 ) 1 (169 ) 646 475 OCI before reclassifications 64 — (22 ) 203 245 Amounts reclassified from AOCI — — 14 — 14 OCI for the year ended December 31, 2020 64 — (8 ) 203 259 Cumulative tax impact (8 ) — (3 ) — (11 ) OCI for the year ended December 31, 2020, net of tax 56 — (11 ) 203 248 December 31, 2020 61 1 (231 ) 849 680 Cumulative tax impact (8 ) — 51 — 43 December 31, 2020, net of tax 53 1 (180 ) 849 723 Items reclassified out of Accumulated Other Comprehensive Income for the years ended December 31, 2020, 2019 and 2018 are listed in the table below: Details about AOCI components Amounts reclassified from AOCI in the year ended December 31, 2020 Amounts reclassified from AOCI in the year ended December 31, 2019 Amounts reclassified from AOCI in the year ended December 31, 2018 Affected line item in the statement where net income (loss) is presented Gains (Losses) on Cash Flow Hedges Foreign exchange derivative contracts (3 ) (51 ) 4 Cost of sales Foreign exchange derivative contracts 1 (6 ) (1 ) Selling, general and administrative Foreign exchange derivative contracts 2 (22 ) (2 ) Research and development — 10 — Income tax benefit (expense) — (69 ) 1 Net of tax Defined Benefit Pension Plan Items Amortization of actuarial gains (losses) (13 ) (13 ) (10 ) Other components of pension benefit costs Amortization of prior service cost (1 ) (1 ) (1 ) Other components of pension benefit costs 3 3 2 Income tax benefit (expense) (11 ) (11 ) (9 ) Net of tax Total reclassifications for the year (11 ) (80 ) (8 ) Attributable to noncontrolling interest — — — Attributable to the parent company stockholders (11 ) (80 ) (8 ) 1 8 .7 Dividends The Annual General Meeting of Shareholders held on June 17, 2020 authorized the distribution of a cash dividend of $0.168 per outstanding share of the Company’s common stock, to be distributed in quarterly installments of $0.042 in each of the second, third and fourth quarters of 2020 and first quarter of 2021. The amount of $37 million corresponding to the first installment, $38 million corresponding to the second installment and $34 million corresponding to the third installment were paid as at December 31, 2020. The remaining portion of $4 million related to the third installment and the last installment of $38 million are presented in the line “Dividends payable to stockholders” in the consolidated balance sheet as at December 31, 2020. The Annual General Meeting of Shareholders held on May 31, 2019 authorized the distribution of a cash dividend of $0.24 per outstanding share of the Company’s common stock, to be distributed in quarterly installments of $0.06 in each of the second, third and fourth quarters of 2019 and first quarter of 2020. The amount of $53 million corresponding to the first installment, $53 million corresponding to the second installment and $48 million corresponding to the third installment were paid as at December 31, 2019. The remaining portion of $6 million related to the third installment and the last installment of $53 million were paid in the first half of 2020. The Annual General Meeting of Shareholders held on May 31, 2018 authorized the distribution of a cash dividend of $0.24 per outstanding share of the Company’s common stock, to be distributed in quarterly installments of $0.06 The Annual General Meeting of Shareholders held on June 20, 2017 authorized the distribution of a cash dividend of $0.24 per outstanding share of the Company’s common stock, to be distributed in quarterly installments of $0.06

Revenues

Revenues	12 Months Ended
Revenues	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Revenues	1 9 . REVENUES 19.1 Nature of goods and services The Company designs, develops, manufactures and markets a broad range of products, including discrete and standard commodity components, application-specific integrated circuits (“ASICs”), full-custom devices and semi-custom devices and application specific standard products (“ASSPs”) for analog, digital and mixed-signal applications. In addition, the Company participates in the manufacturing value chain of smartcard products, which includes the production and sale of both silicon chips and smartcards. The principal activities – separated by reportable segments – from which the Company generates its revenues are described in Note 20. Other revenues consist of license revenue, service revenue related to transferring licenses, patent royalty income, sale of scrap materials and manufacturing by-products. While the majority of the Company’s sales agreements contain standard terms and conditions, the Company may, from time to time, enter into agreements that contain multiple performance obligations or terms and conditions. Those agreements concern principally the revenues from services, where the performance obligation is satisfied over time. The objective when allocating the transaction price is to allocate the transaction price to each performance obligation (or distinct good or service) in an amount that depicts the amount of consideration to which the Company expects to be entitled in exchange for transferring the promised goods or services to the customer. 1 9 .2 Revenue recognition and disaggregation The Company recognizes revenue from products sold to a customer, including distributors, when it satisfies a performance obligation at a point in time by transferring control over a product to the customer. This usually occurs at the time of shipment. The performance obligations linked to the sale of goods contracts have the original expected length of less than one year. The transaction price is determined based on the contract terms, adjusted for price protection, if applicable. The revenues from services are usually linked to performance obligations transferred over time and are recognized in line with the contract terms. The payment terms typically range between 30 and 90 days. The Company’s consolidated net revenues disaggregated by product group are presented in Note 20 . The following tables present the Company’s consolidated net revenues disaggregated by geographical region of shipment and nature. Year ended December 31, 2020 December 31, 2019 December 31, 2018 Net revenues by geographical region of shipment (1) EMEA 1,966 2,265 2,478 Americas 1,165 1,351 1,264 Asia Pacific 7,088 5,940 5,922 Total revenues 10,219 9,556 9,664 Net revenues by nature Revenues from sale of products 10,049 9,381 9,461 Revenues from sale of services 132 148 151 Other revenues 38 27 52 Total revenues 10,219 9,556 9,664 Net revenues by market channel (2) Original Equipment Manufacturers (“OEM”) 7,411 6,720 6,325 Distribution 2,808 2,836 3,339 Total revenues 10,219 9,556 9,664 (1) Net revenues by geographical region of shipment are classified by location of customer invoiced or reclassified by shipment destination in line with customer demand. For example, products ordered by U.S.-based companies to be invoiced to Asia Pacific affiliates are classified as Asia Pacific revenues. (2) Original Equipment Manufacturers (“OEM”) are the end-customers to which the Company provides direct marketing application engineering support, while Distribution customers refers to the distributors and representatives that the Company engages to distribute its products around the world. The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which the Company recognizes revenue at the amount to which the Company has the right to invoice for services performed.

Segment Information

Segment Information	12 Months Ended
Segment Information	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Information	20 . SEGMENT INFORMATION The Company designs, develops, manufactures and markets a broad range of products, including discrete and standard commodity components, application-specific integrated circuits (“ASICs”), full custom devices and semi-custom devices and application-specific standard products (“ASSPs”) for analog, digital, and mixed-signal applications. In addition, the Company further participates in the manufacturing value chain of smartcard products, which includes the production and sale of both silicon chips and smartcards. The Company’s reportable segments are as follows: • Automotive and Discrete Group (ADG) , comprised of dedicated automotive ICs, and discrete and power transistor products. • Analog, MEMS and Sensors Group (AMS) , comprised of analog, smart power, low power RF, MEMS sensors and actuators, and optical sensing solutions. • Microcontrollers and Digital ICs Group (MDG) , comprised of microcontrollers (general purpose and secure), memories (RF and EEPROM), and RF communications. For the computation of the segments’ internal financial measurements, the Company uses certain internal rules of allocation for the costs not directly chargeable to the segments, including cost of sales, selling, general and administrative expenses and a part of research and development expenses. In compliance with the Company’s internal policies, certain costs are not allocated to the segments, but reported in “Others”. Those comprise unused capacity charges, including reduced manufacturing activity due to COVID-19, impairment, restructuring charges and other related closure costs, management reorganization expenses, phase-out and start-up costs of certain manufacturing facilities, and other unallocated expenses such as: strategic or special research and development programs, certain corporate-level operating expenses, patent claims and litigations, and other costs that are not allocated to product groups, as well as operating earnings of other products . In addition, depreciation and amortization expense is part of the manufacturing costs allocated to the segments and is neither identified as part of the inventory variation nor as part of the unused capacity charges; therefore, it cannot be isolated in the costs of goods sold. Finally, R&D grants are allocated to the Company’s segments proportionally to the incurred R&D expenses on the sponsored projects. Wafer costs are allocated to the segments based on actual cost. From time to time, with respect to specific technologies, wafer costs are allocated to segments based on market price. The following tables present the Company’s consolidated net revenues and consolidated operating income by reportable segment. Net revenues by reportable segment: December 31, 2020 December 31, 2019 December 31, 2018 Automotive and Discrete Group (ADG) 3,284 3,606 3,556 Analog, MEMS and Sensors Group (AMS) 3,892 3,299 3,154 Microcontrollers and Digital ICs Group (MDG) 3,030 2,638 2,940 Total net revenues of product segments 10,206 9,543 9,650 Others 13 13 14 Total consolidated net revenues 10,219 9,556 9,664 Operating income by reportable segment: December 31, 2020 December 31, 2019 December 31, 2018 Automotive and Discrete Group (ADG) 182 357 431 Analog, MEMS and Sensors Group (AMS) 810 596 488 Microcontrollers and Digital ICs Group (MDG) 504 354 547 Total operating income of product segments 1,496 1,307 1,466 Others (1) (173 ) (104 ) (66 ) Total consolidated operating income 1,323 1,203 1,400 (1) Operating income (loss) of “Others” includes items such as unused capacity charges, including reduced manufacturing activity due to COVID-19, impairment, restructuring charges and other related closure costs, management reorganization costs, phase out and start-up costs of certain manufacturing facilities, and other unallocated expenses such as: strategic or special research and development programs, certain corporate-level operating expenses, patent claims and litigations, and other costs that are not allocated to product groups, as well as operating earnings of other products . Reconciliation of operating income of segments to the total operating income: December 31, 2020 December 31, 2019 December 31, 2018 Total operating income of segments 1,496 1,307 1,466 Impairment, restructuring charges and other related closure costs (11 ) (5 ) (21 ) Unused capacity charges (153 ) (65 ) (1 ) Other unallocated manufacturing results (8 ) (25 ) 2 Gain on sale of non-current assets 11 6 1 Strategic and other research and development programs and other non-allocated provisions (1) (12 ) (15 ) (47 ) Total operating loss Others (173 ) (104 ) (66 ) Total consolidated operating income 1,323 1,203 1,400 (1) Includes unallocated income and expenses such as certain corporate-level operating expenses and other income (costs) that are not allocated to the product segments. The following is a summary of operations by entities located within the indicated geographic areas for 20 20 , 201 9 and 201 8 . Net revenues represent sales to third parties from the country in which each legal entity is incorporated . Long-lived assets consist of property, plant and equipment, net (PP&E, net) . A significant portion of property, plant and equipment expenditures is attributable to front-end and back-end facilities, located in the different countries in which the Company operates . As such, the Company mainly allocates capital spending resources according to geographic areas rather than along product segment areas. Net revenues December 31, 2020 December 31, 2019 December 31, 2018 Netherlands 2,795 2,842 2,917 France 89 108 127 Italy 52 59 64 USA 976 1,157 1,132 Singapore 5,817 4,857 4,873 Japan 479 520 534 Other countries 11 13 17 Total 10,219 9,556 9,664 Property, plant and equipment December 31, 2020 December 31, 2019 Netherlands 1,046 897 France 905 726 Italy 1,213 900 Other European countries 118 117 USA 24 25 Singapore 604 670 Malaysia 186 218 Other countries 500 454 Total 4,596 4,007

Other Income and Expenses, Net

Other Income and Expenses, Net	12 Months Ended
Other Income and Expenses, Net	Dec. 31, 2020
Other Income And Expenses [Abstract]
Other Income and Expenses, Net	2 1 . OTHER INCOME AND EXPENSES, NET Other income and expenses, net consisted of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Research and development funding 231 132 52 Phase-out and start-up costs (8 ) (38 ) (1 ) Exchange gains and losses, net 8 — 4 Patent costs (11 ) (1 ) (8 ) Gain on sale of non-current assets 14 7 8 COVID-19 incremental costs (32 ) — — Other, net — 3 (2 ) Total 202 103 53 The Company receives significant public funding from governmental agencies in several jurisdictions. Public funding for research and development is recognized ratably as the related costs are incurred once the agreement with the respective governmental agency has been signed and all applicable conditions have been met. R&D funding received in the year ended December 31, 2017 from the Nano2017 program with the French government is subject to a financial return in the year 2024 and depends on the future cumulative sales of a certain product group over a five-year period. As such, the criteria for recognizing the grant income are not met. As at December 31, 2020, an amount of $42 million, corresponding primarily to the Nano2017 program, was reported as a liability in the consolidated balance sheet, compared to an amount of $47 million as at December 31, 201 9 . The Company also participates in the European Commission's Important Projects of Common Interests (IPCEI), until 2022 in France and until 2024 in Italy. For the latter, the Company reported $ 206 million receivables, of which $ 105 million reported on the line "Other current assets" in the consolidated balance sheet for the year ended December 31, 2020. Phase-out costs are costs incurred during the closing stage of a Company’s manufacturing facility. They are treated in the same manner as start-up costs. Start-up costs represent costs incurred in the start-up and testing of the Company’s new manufacturing facilities, before reaching the earlier of a minimum level of production or six months after the fabrication line’s quality certification Exchange gains and losses, net represent the portion of exchange rate changes on transactions denominated in currencies other than an entity’s functional currency and the changes in fair value of derivative instruments which are not designated as hedges and which have a cash flow effect related to operating transactions, as described in Note 28 Patent costs include legal and attorney fees and payment for claims, patent pre-litigation consultancy and legal fees. They are reported net of settlements, if any, which primarily include reimbursements of prior patent litigation costs COVID-19 incremental costs are mainly composed of purchases of medical disposables, such as masks and sanitizers, and other expenses related to sanitary measures undertaken to protect employees during the COVID-19 pandemic.

Impairment, Restructuring Charg

Impairment, Restructuring Charges and Other Related Closure Costs	12 Months Ended
	Dec. 31, 2020
Restructuring And Related Activities [Abstract]
Impairment, Restructuring Charges and Other Related Closure Costs	2 2 . IMPAIRMENT, RESTRUCTURING CHARGES AND OTHER RELATED CLOSURE COSTS Impairment, restructuring charges and other related closure costs incurred in 2020, 2019 and 2018 are summarized as follows: Year ended December 31, 2020 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — 1 — 1 Bouskoura restructuring plan — (8 ) — (8 ) Long-lived asset impairment charge (4 ) — — (4 ) Total (4 ) (7 ) — (11 ) Year ended December 31, 2019 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — 2 — 2 Long-lived asset impairment charge (7 ) — — (7 ) Total (7 ) 2 — (5 ) Year ended December 31, 2018 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — (19 ) — (19 ) Long-lived asset impairment charge (2 ) — — (2 ) Total (2 ) (19 ) — (21 ) Impairment charges In 2020, the Company recorded a $4 million impairment charge, primarily on licenses dedicated exclusively to certain development projects that were cancelled, while no alternative future use was identified internally. In 2019, the Company recorded a $7 million impairment charge, primarily on equipment or licenses dedicated exclusively to certain development projects that were cancelled, while no alternative future use was identified internally. In 2018, the Company recorded a $2 million impairment charge on acquired technologies for which it was determined that they had no alternative future use. During the third quarter of 2020, 2019 and 2018 the Company conducted its annual impairment test, which did not result in any significant impairment loss. Restructuring charges and other related closure costs Changes to the restructuring provisions recorded on the consolidated balance sheets from December 31, 2018 to December 31, 2020 are summarized as follows: Set-top Box restructuring plan Bouskoura restructuring plan Other restructuring initiatives Total Provision as at December 31, 2018 34 — 1 35 Adjustment for unused provisions (2 ) — — (2 ) Amounts paid (20 ) — (1 ) (21 ) Currency translation effect (1 ) — — (1 ) Provision as at December 31, 2019 11 — — 11 Charges incurred in 2020 — 8 — 8 Adjustment for unused provisions (1 ) — — (1 ) Amounts paid (6 ) (8 ) — (14 ) Provision as at December 31, 2020 4 — — 4 • Set-top Box restructuring plan In 2016, the Company announced its decision to cease the development of new platforms and standard products for set-top-box and home gateway products. This decision resulted in a global workforce review affecting approximately 1,400 employees worldwide, which included about 430 employees in France through a voluntary departure plan, about 670 employees in Asia and about 120 employees in the United States of America. The Company recorded in 2020 and 2019 a $1 million and $2 million, respectively, as a reversal on unused provision. The Company recorded $19 million restructuring charges for this plan in 2018. An amount of $4 million is expected to be paid within twelve months, as detailed in Note 14. The Set-top Box restructuring plan was expected to result in pre-tax charges of approximately $170 million. Since inception, restructuring charges, totaling $132 million, were incurred as at December 31, 2020. The plan was substantially completed in 2018 in all locations • Bouskoura restructuring plan In the fourth quarter of 2019, management committed to a restructuring plan impacting its back-end activities. A voluntary plan involving a reduction in force representing approximately 150 employees was announced in Bouskoura, Morocco, in December 2019, in compliance with local legislation. The Company recorded in 2020 a restructuring charge totaling $8 million for this plan, corresponding to the voluntary termination benefits to be paid to 179 employees who signed the offer for voluntary leave in 2020. The Bouskoura restructuring plan was expected to result in pre-tax charges of approximately $7 million. It has been substantially completed at the end of 2020. In 20 20 , total amounts paid for restructuring and related closure costs amounted to $ 14 million . The total actual costs that the Company will incur may differ from these estimates based on the timing required to complete the restructuring plan, the number of people involved, the final agreed termination benefits and the costs associated with the transfer of equipment, products and processes.

Interest Income (Expense), Net

Interest Income (Expense), Net	12 Months Ended
Interest Income (Expense), Net	Dec. 31, 2020
Banking And Thrift Interest [Abstract]
Interest Income (Expense), Net	2 3 . INTEREST INCOME (EXPENSE), NET Interest income (expense), net consisted of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income 34 55 47 Expense (54 ) (54 ) (54 ) Total (20 ) 1 (7 ) Interest income is related to cash and cash equivalents, short-term deposits and marketable securities held by the Company. Interest expense recorded in 2020 included a charge of $36 million on the senior unsecured convertible bonds issued on and a charge of $9 on the senior unsecured convertible bonds issued on Net interest also included charges related to the banking fees and the sale of trade and other receivables. No borrowing cost was capitalized in 2020, 2019 and 2018. Interest income on U.S. Treasury Bonds classified as available-for-sale marketable securities amounted to $ 3

Income Tax

Income Tax	12 Months Ended
Income Tax	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Tax	2 4 . INCOME TAX Income (loss) before income tax is comprised of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income (loss) recorded in the Netherlands (19 ) (9 ) (13 ) Income (loss) from foreign operations 1,286 1,198 1,402 Income (loss) before income tax benefit (expense) 1,267 1,189 1,389 STMicroelectronics N.V. and its subsidiaries are individually liable for income taxes in their jurisdictions. Tax losses can only offset profits generated by the taxable entity incurring such loss. Income tax benefit (expense) is comprised of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 The Netherlands taxes - current — — — Foreign taxes - current (171 ) (131 ) (114 ) Total current taxes (171 ) (131 ) (114 ) The Netherlands taxes - deferred — — — Foreign taxes - deferred 12 (25 ) 18 Total deferred taxes 12 (25 ) 18 Income tax expense (159 ) (156 ) (96 ) Effective tax rate 13 % 13 % 7 % The principal items comprising the differences in income taxes computed at the Netherlands statutory rate of 25.0% in 2020, 2019 and 2018, and the effective income tax rate are the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income tax benefit (expense) computed at statutory rate (316 ) (297 ) (353 ) Non-deductible and non-taxable permanent differences, net (1 ) 4 45 Valuation allowance adjustments 11 2 141 Effect on deferred taxes of changes in enacted tax rates (5 ) 14 (62 ) Current year credits 40 50 43 Other tax and credits (40 ) (51 ) (20 ) Benefits from tax holidays 37 129 135 Net impact of changes to uncertain tax positions (1 ) (5 ) (16 ) Earnings of subsidiaries taxed at different rates 116 (2 ) (9 ) Income tax benefit (expense) (159 ) (156 ) (96 ) The tax holidays represent a tax exemption period aimed to attract foreign technological investment in certain tax jurisdictions. The effect of the tax benefits, from tax holidays for countries which are profitable, Deferred tax assets and liabilities consisted of the following: December 31, 2020 December 31, 2019 Tax loss carryforwards and investment credits 702 612 Less unrecognized tax benefit (19 ) (21 ) Tax loss carryforwards net of unrecognized tax benefit 683 591 Inventory valuation 34 28 Impairment and restructuring charges 3 6 Fixed asset depreciation in arrears 82 39 Increased depreciation incentives 182 213 Capitalized development costs 107 118 Receivables for government funding 40 14 Tax credits granted on past capital investments 215 1,151 Pension service costs 104 81 Stock awards 11 6 Operating lease liabilities 36 40 Commercial accruals 13 15 Other temporary differences 26 22 Total deferred tax assets 1,536 2,324 Valuation allowances (638 ) (1,534 ) Deferred tax assets, net 898 790 Accelerated fixed asset depreciation (21 ) (20 ) Acquired intangible assets (40 ) (16 ) Advances of government funding (94 ) (31 ) Operating lease right-of-use assets (36 ) (40 ) Other temporary differences (43 ) (7 ) Deferred tax liabilities (234 ) (114 ) Net deferred income tax asset 664 676 For a particular tax-paying component of the Company and within a particular tax jurisdiction, all current deferred tax liabilities and assets are offset and presented as a single amount, similarly to non-current deferred tax liabilities and assets. The Company does not offset deferred tax liabilities and assets attributable to different tax-paying components or to different tax jurisdictions. The net deferred tax assets are recorded in legal entities which have been historically profitable and are expected to be profitable in the next coming years. As at December 31, 2020, the Company and its subsidiaries have gross deferred tax assets on tax loss carryforwards and investment credits that expire starting 2021, as follows : Year 2021 4 2022 7 2023 5 2024 4 2025 13 Thereafter 669 Total 702 The “Tax credits granted on past capital investments” mainly related to a 2003 agreement granting the Company certain tax credits for capital investments purchased through the year ending December 31, 2006. Any unused tax credits granted under the agreement will be impacted yearly by a legal inflationary index (currently -0.15% per annum). The credits may be utilized through 2021 or later depending on the Company meeting certain program criteria. In addition to this agreement, starting in 2007 the Company continues to receive tax credits on the yearly capital investments, which may be used to offset that year’s tax liabilities and increases by the legal inflationary rate. However, pursuant to the inability to utilize these credits currently and in future years, the Company did not recognize any deferred tax asset on such tax allowance. As a result, there is no financial impact to the net deferred tax assets of the Company. In 2020, we recognized a deferred tax expense of $11 million as a component of other comprehensive income (loss), compared to a deferred tax gain of $6 million in 2019. They were related primarily to the tax effects of the recognized unfunded status on defined benefits plan. The cumulative amount of distributable earnings related to the Company’s investments in foreign subsidiaries and corporate joint ventures was $3,783 million and $3,628 million as at December 31, 2020 and December 31, 2019, respectively. Due to the Company’s legal and tax structure, with the parent company established in the Netherlands, there was no significant tax impact from the distribution of earnings from investments in foreign subsidiaries and corporate joint ventures. This is because there is no tax impact on dividends paid up to a Dutch holding company. A reconciliation of 2020, 2019 and 2018 beginning and ending amounts of unrecognized tax benefits is as follows: December 31, 2020 December 31, 2019 December 31, 2018 Balance at beginning of year 48 38 333 Additions based on tax positions related to the current year 1 7 43 Additions based on acquisitions related to the current year — 5 — Additions for tax positions of prior years 1 1 8 Reduction for tax positions of prior years (2 ) (1 ) (310 ) Settlements (1 ) (2 ) (18 ) Foreign currency translation 1 — (18 ) Balance at end of year 48 48 38 At December 31, 2020 and 2019, $19 million and $21 million, respectively, of unrecognized tax benefits were classified as a reduction of deferred tax assets. It is reasonably possible that certain of the uncertain tax positions disclosed in the table above could increase within the next 12 months due to ongoing tax audits. The Company is not able to make an estimate of the range of the reasonably possible change. Additionally, the Company elected to classify accrued interest and penalties related to uncertain tax positions as components of income tax expense in the consolidated statements of income. They were less than $1 million in 2020, less than $1 million in 2019 and $1 million in 2018. Accrued interest and penalties amounted to $7 million as at December 31, 2020 and $6 million as at December 31, 2019. The tax years that remain open for review in the Company’s major tax jurisdictions, including France, Italy, United States and India, are from 1997 to 2020

Earnings per Share

Earnings per Share	12 Months Ended
Earnings per Share	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings per Share	2 5 . EARNINGS PER SHARE For the years ended December 31, 2020, 2019 and 2018, earnings per share (“EPS”) was calculated as follows: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Basic EPS Net income attributable to parent company 1,106 1,032 1,287 Weighted average shares outstanding 894,578,477 894,297,697 899,363,170 Basic EPS 1.24 1.15 1.43 Diluted EPS Net income attributable to parent company 1,106 1,032 1,287 Weighted average shares outstanding 894,578,477 894,297,697 899,363,170 Dilutive effect of stock awards 8,860,216 7,014,595 7,251,641 Dilutive effect of convertible debt 16,291,279 2,333,493 4,341,334 Number of shares used in calculating diluted EPS 919,729,972 903,645,785 910,956,145 Diluted EPS 1.20 1.14 1.41 In application of the treasury method implying that the Company intends to settle the convertible bonds on a net-share basis, there was no dilutive effect of the senior unsecured convertible bonds issued on August 4, 2020 in the 2020 diluted Earnings per Share since the conversion features were out-of-the-money. Dilutive effect of convertible bonds presented in the table above is related to the senior unsecured convertible bonds issued on July 3, 2017. The dilutive effect of the convertible bonds is measured based on the treasury method according to which the dilutive effect of the convertible bonds is included in the denominator of diluted EPS for the amount of shares transferred assuming a net-share settlement. Based on the stock price measured as at December 31, 2020 ($37.12), the consideration transferred to bondholders of the Tranche B of the convertible bonds issued on July 3, 2017, if converted, would exceed the $750 million principal amount by $605 million.

Commitments

Commitments	12 Months Ended
Commitments	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Commitments	2 6 . COMMITMENTS The Company’s commitments as at December 31, 2020 were as follows: In millions of U.S. dollars Total 2021 2022 2023 2024 2025 Thereafter Purchase obligations 1,978 1,488 237 124 68 61 — of which: Equipment purchase 916 916 — — — — — Foundry purchase 935 475 216 119 64 61 — Software, design, technologies and licenses 127 97 21 5 4 — — Other obligations 869 452 120 62 83 62 90 Total 2,847 1,940 357 186 151 123 90 Purchase obligations are primarily comprised of purchase commitments for equipment, for outsourced foundry wafers and for software licenses. Other obligations primarily relate to firm contractual commitments with respect to partnership and cooperation agreements and other service agreements.

Contingencies, Claims and Legal

Contingencies, Claims and Legal Proceedings	12 Months Ended
Contingencies, Claims and Legal Proceedings	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Contingencies, Claims and Legal Proceedings	2 7 . CONTINGENCIES, CLAIMS AND LEGAL PROCEEDINGS The Company is subject to possible loss contingencies arising in the ordinary course of business. These include but are not limited to: product liability claims and/or warranty cost on the products of the Company, contractual disputes, indemnification claims, claims for unauthorized use of third-party intellectual property, employee grievances, tax claims beyond assessed uncertain tax positions as well as claims for environmental damages. In determining loss contingencies, the Company considers the likelihood of impairing an asset or the incurrence of a liability at the date of the consolidated financial statements as well as the ability to reasonably estimate the amount of such loss. The Company records a provision for a loss contingency when information available before the consolidated financial statements are issued or are available to be issued indicates that it is probable that an asset has been impaired or a liability has been incurred at the date of the consolidated financial statements and when the amount of loss can be reasonably estimated. The Company regularly re-evaluates claims to determine whether provisions need to be readjusted based on the most current information available to the Company. Changes in these evaluations could result in an adverse material impact on the Company’s results of operations, cash flows or its financial position for the period in which they occur. The Company has received and may in the future receive communications alleging possible infringements of third-party patents or other third-party intellectual property rights. Furthermore, the Company from time to time enters into discussions regarding a broad patent cross license arrangement with other industry participants. There is no assurance that such discussions may be brought to a successful conclusion and result in the intended agreement. The Company may become involved in costly litigation brought against the Company regarding patents, mask works, copyrights, trademarks or trade secrets. In the event that the outcome of any litigation would be unfavorable to the Company, the Company may be required to take a license to third party patents and/or other intellectual property rights at economically unfavorable terms and conditions, and possibly pay damages for prior use and/or face an injunction, all of which individually or in the aggregate could have a material adverse effect on the Company’s results of operations, cash flows, financial position and/or ability to compete. The Company has contractual commitments to various customers which could require the Company to incur costs to repair or replace defective products it supplies to such customer. The duration of these contractual commitments varies and, in certain cases, is indefinite. The Company is otherwise also involved in various lawsuits, claims, inquiries, inspections, investigations and/or proceedings incidental to its business and operations. Such matters, even if not meritorious, could result in the expenditure of significant financial or managerial resources. Any of the foregoing could have a material adverse effect on the Company’s results of operations, cash flows or its financial position. The Company regularly evaluates claims and legal proceedings together with their related probable losses to determine whether they need to be adjusted based on the current information available to the Company. There can be no assurance that its recorded reserves will be sufficient to cover the extent of its potential liabilities. Legal costs associated with claims are expensed as incurred. In the event of litigation which is adversely determined with respect to the Company’s interests, or in the event the Company needs to change its evaluation of a potential third-party claim, based on new evidence or communications, a material adverse effect could impact its operations or financial condition at the time it were to materialize. As at December 31, 2020 and 2019, respectively, provisions for estimated probable losses with respect to claims and legal proceedings were not considered material.

Financial Instruments and Risk

Financial Instruments and Risk Management	12 Months Ended
Financial Instruments and Risk Management	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Financial Instruments and Risk Management	2 8 . FINANCIAL INSTRUMENTS AND RISK MANAGEMENT 2 8 .1 Financial risk factors The Company is exposed to changes in financial market conditions in the normal course of business due to its operations in different foreign currencies and its ongoing investing and financing activities. The Company’s activities expose it to a variety of financial risks: market risk (including foreign exchange risk, fair value interest rate risk, cash flow interest rate risk and price risk), credit risk and liquidity risk. The Company’s overall risk management program focuses on the unpredictability of financial markets and seeks to minimize potential adverse effects on the Company’s financial performance. The Company uses derivative financial instruments to hedge certain risk exposure Financial risk management is carried out by a central treasury department (Corporate Treasury). Additionally, a Treasury Committee, chaired by the CFO, steers treasury activities and ensures compliance with corporate policies. Treasury activities are thus regulated by the Company’s policies, which define procedures, objectives and controls. The policies focus on the management of financial risk in terms of exposure to market risk, credit risk and liquidity risk. Treasury controls are subject to internal audits. Most treasury activities are centralized, with any local treasury activities subject to oversight from Corporate Treasury. Corporate Treasury identifies, evaluates and hedges financial risks in close cooperation with the Company’s operating units. It provides written principles for overall risk management, as well as written policies covering specific areas, such as foreign exchange risk, interest rate risk, price risk, credit risk, use of derivative financial instruments, and investments of excess liquidity . The majority of cash and cash equivalents is held in U.S . dollars and Euros and is placed with financial institutions rated at least a single “A” long-term rating from two of the major rating agencies, meaning at least A3 from Moody’s Investor Service and A- from Standard & Poor’s and Fitch Ratings, or better . These ratings are closely and continuously monitored in order to manage exposure to the counterparty’s risk . Hedging transactions are performed only to hedge exposures deriving from operating, investing and financing activities conducted in the normal course of business. Market risk Foreign exchange risk The Company conducts its business on a global basis in various major international currencies. As a result, the Company is exposed to adverse movements in foreign currency exchange rates, primarily with respect to the Euro. Foreign exchange risk mainly arises from recognized assets and liabilities at the Company’s subsidiaries and future commercial transactions. Management has set up a policy to require the Company’s subsidiaries to hedge their entire foreign exchange risk exposure with the Company through financial instruments transacted or overseen by Corporate Treasury. To manage their foreign exchange risk arising from foreign-currency-denominated assets and liabilities, subsidiaries use forward contracts and purchased currency options. Foreign exchange risk arises when recognized assets and liabilities are denominated in a currency that is not the entity’s functional currency. These instruments do not qualify as hedging instruments for accounting purposes. Forward contracts and currency options, including collars, are also used by the Company to reduce its exposure to U.S. dollar fluctuations in Euro-denominated forecasted intercompany transactions that cover a large part of its research and development, selling, general and administrative expenses as well as a portion of its front-end manufacturing costs of semi-finished goods. The Company also hedges through the use of currency forward contracts certain Singapore dollar-denominated manufacturing forecasted transactions. The derivative instruments used to hedge these forecasted transactions meet the criteria for designation as cash flow hedge. The hedged forecasted transactions have a high probability of occurring for hedge accounting purposes. It is the Company’s policy to have the foreign exchange exposures in all the currencies hedged month by month against the monthly standard rate. At each month end, the forecasted flows for the coming month are hedged together with the fixing of the new standard rate. For this reason, the hedging transactions will have an exchange rate very close to the standard rate at which the forecasted flows will be recorded on the following month. As such, the foreign exchange exposure of the Company, which consists in the balance sheet positions and other contractually agreed transactions, is always close to zero and any movement in the foreign exchange rates will not therefore influence the exchange effect on items of the consolidated statement of income. Any discrepancy from the forecasted values and the actual results is constantly monitored and prompt actions are taken, if needed. Derivative Instruments Not Designated as a Hedge The Company enters into foreign currency forward contracts to reduce its exposure to changes in exchange rates and the associated risk arising from the denomination of certain assets and liabilities in foreign currencies in the Company’s subsidiaries. These include receivables from international sales by various subsidiaries, payables for foreign currency-denominated purchases and certain other assets and liabilities arising from intercompany transactions. The notional amount of these financial instruments totaled $897 million, $575 million and $376 million at December 31, 2020, 2019 and 2018, respectively. The principal currencies covered at the end of the year 2020 are the Euro, the Singapore dollar, the Swedish krona, the China Yuan Renminbi, the Swiss franc, the Moroccan dirham, the Japanese yen, the Malaysian ringgit, the Indian rupee, the Philippines peso, the South Korean won and the Taiwan dollar. The risk of loss associated with forward contracts is equal to the exchange rate differential from the time the contract is entered into until the time it is settled. The risk of loss associated with purchased currency options is equal to the premium paid when the option is not exercised. Foreign currency forward contracts not designated as cash flow hedge outstanding as at December 31, 2020 have remaining terms of 4 days to 181 days, maturing on average after 42 days. Derivative Instruments Designated as a Hedge To further reduce its exposure to U.S. dollar exchange rate fluctuations, the Company hedges through the use of currency forward contracts and currency options, including collars, certain Euro-denominated forecasted intercompany transactions that cover at year-end a large part of its research and development, selling, general and administrative expenses, as well as a portion of its front-end manufacturing costs of semi-finished goods within cost of sales. The Company also hedges through the use of currency forward contracts certain manufacturing transactions within cost of sales denominated in Singapore dollars. The principles regulating the hedging strategy for derivatives designated as cash flow hedge are established as follows: (i) for R&D and corporate costs, up to 80% of the total forecasted transactions; (ii) for manufacturing costs, up to 70% of the total forecasted transactions. In order to follow a dynamic hedge strategy, the Company may change the percentage of the designated hedged item within the limit of 100% of the forecasted transaction. The maximum length of time over which the Company could hedge its exposure to the variability of cash flows for forecasted transactions is 24 months. For the year ended December 31, 2020, the Company recorded an increase in cost of sales of $3 million and a decrease in operating expenses of $3 million, related to the realized losses and gains incurred on such hedged transactions. For the year ended December 31, 2019, the Company recorded an increase in cost of sales of $51 million and an increase in operating expenses of $28 million, related to the realized losses incurred on such hedged transactions. For the year ended December 31, 2018, the Company recorded a decrease in cost of sales of $4 million and an increase in operating expenses of $3 million, related to the realized gains and losses incurred on such hedged transactions. The notional amount of foreign currency forward contracts and currency options, including collars, designated as cash flow hedge totaled $1,502 million, $1,328 million and $1,597 million at December 31, 2020, 2019 and 2018, respectively. The forecasted transactions hedged at December 31, 2020 were determined to have a high probability of occurring. As at December 31, 2020, $61 million of deferred gains on derivative instruments included in “Accumulated other comprehensive income (loss)” in the consolidated statements of equity were expected to be reclassified as earnings during the next 12 months based on the monthly forecasted research and development expenses, corporate costs and semi-finished manufacturing costs. Foreign currency forward contracts and collars designated as cash flow hedge outstanding as at December 31, 2020 have remaining terms of 6 days to 11 months, maturing on average after 118 days. As at December 31, 2020, the Company had the following outstanding derivative instruments that were entered into to hedge Euro-denominated and Singapore dollar-denominated forecasted transactions: In millions of Euros Notional amount for hedge on forecasted R&D and other operating expenses Notional amount for hedge on forecasted manufacturing costs Forward contracts 215 341 Currency collars 237 334 In millions of Singapore dollars Notional amount for hedge on forecasted R&D and other operating expenses Notional amount for hedge on forecasted manufacturing costs Forward contracts — 157 Cash flow and fair value interest rate risk The Company’s interest rate risk arises from long-term borrowings. Borrowings issued at variable rates expose the Company to cash flow interest rate risk. Borrowings issued at fixed rates expose the Company to fair value interest rate risk. The Company analyses its interest rate exposure on a dynamic basis. Various scenarios are simulated taking into consideration refinancing, renewal of existing positions, alternative financing and hedging. The Company invests primarily on a short-term basis and as such the Company’s liquidity is invested in floating interest rate instruments. As a consequence, the Company is exposed to interest rate risk due to potential mismatch between the return on its short - term floating interest rate investments and the portion of its long - term debt issued at fixed rate . Price risk As part of its ongoing investing activities, the Company may be exposed to equity security price risk for investments in public entities. In order to hedge the exposure to this market risk, the Company may enter into certain derivative hedging transactions. Information on fair value of derivative instruments and their location in the consolidated balance sheets as at December 31, 2020 and December 31, 2019 is presented in the table below: As at December 31, 2020 As at December 31, 2019 Asset Derivatives Balance sheet location Fair value Balance sheet location Fair value Derivatives designated as a hedge: Foreign exchange forward contracts Other current assets 40 Other current assets 4 Currency collars Other current assets 15 Other current assets 1 Total derivatives designated as a hedge 55 5 Derivatives not designated as a hedge: Foreign exchange forward contracts Other current assets 10 Other current assets 3 Total derivatives not designated as a hedge: 10 3 Total Derivatives 65 8 As at December 31, 2020 As at December 31, 2019 Liability Derivatives Balance sheet location Fair value Balance sheet location Fair value Derivatives designated as a hedge: Foreign exchange forward contracts Other payables and accrued liabilities — Other payables and accrued liabilities (4 ) Currency collars Other payables and accrued liabilities — Other payables and accrued liabilities (2 ) Total derivatives designated as a hedge — (6 ) Derivatives not designated as a hedge: Foreign exchange forward contracts Other payables and accrued liabilities (2 ) Other payables and accrued liabilities (1 ) Total derivatives not designated as a hedge: (2 ) (1 ) Total Derivatives (2 ) (7 ) The effect on the consolidated statements of income for the year ended December 31, 2020 and December 31, 2019 and on the “Accumulated other comprehensive income (loss)” (“AOCI”) as reported in the consolidated statements of equity as at December 31, 2020 and December 31, 2019 of derivative instruments designated as cash flow hedge is presented in the table below: Gain (loss) deferred in OCI on derivative Location of gain (loss) reclassified from OCI into earnings Gain (loss) reclassified from OCI into earnings December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Foreign exchange forward contracts 29 (1 ) Cost of sales (2 ) (36 ) Foreign exchange forward contracts 3 — Selling, general and administrative 1 (4 ) Foreign exchange forward contracts 11 (1 ) Research and development 2 (15 ) Currency collars 11 (1 ) Cost of sales (1 ) (15 ) Currency collars 1 — Selling, general and administrative — (2 ) Currency collars 6 — Research and development — (7 ) Total 61 (3 ) — (79 ) No significant ineffective portion of the cash flow hedge relationships was recorded in earnings for the years ended December 31, 2020 and December 31, 2019. No amount was excluded from effectiveness measurement on foreign exchange forward contracts and collars. The effect on the consolidated statements of income for the year ended December 31, 2020 and December 31, 2019 of derivative instruments not designated as a hedge is presented in the table below: Location of gain (loss) recognized in earnings Gain (loss) recognized in earnings December 31, 2020 December 31, 2019 Foreign exchange forward contracts Other income and expenses, net (13 ) 1 Total (13 ) 1 The Company did not enter into any derivative containing significant credit-risk-related contingent features. The Company entered into currency collars as combinations of two options, which are reported, for accounting purposes, on a net basis. The fair value of these collars represented as at December 31, 2020 assets for a net amount of $15 million (composed of $16 million assets offset with a $1 million liability). In addition, the Company entered into other derivative instruments, primarily forward contracts, which are governed by standard International Swaps and Derivatives Association (“ISDA”) agreements, which are not offset in the statement of financial position and representing total assets of $50 million and liabilities of $2 million as at December 31, 2020. Credit risk The expected credit loss and impairment methodology applied on each category of financial assets following the adoption of new ASC 326 guidance is further described in each respective note. While cash and cash equivalents are also subject to ASC 326 new requirements, the identified expected credit loss is deemed to be negligible. The maximum credit risk exposure for all financial assets is their carrying amount. Credit risk is the risk that a counterparty will not meet its obligations under a financial instrument or customer contract, leading to a financial loss. Credit risk typically arises from cash and cash equivalents, contractual cash flows of debt investments carried at amortized cost, the counterparty of derivative financial instruments and deposits with banks and financial institutions, as well as credit exposure to customers, including outstanding receivables. The Company is exposed to credit risk from its operating activities (primarily for trade receivables) and from its financing activities, including deposits with banks and financial institutions, foreign exchange transactions and other financial instruments. Credit risk is managed at the Group level. The Company selects banks and/or financial institutions that operate with the group based on the criteria of long-term rating from at least two major Rating Agencies and keeping a maximum outstanding amount per instrument with each bank not to exceed 20% of the total . For derivative financial instruments, management has established limits so that, at any time, the fair value of contracts outstanding is not concentrated with any individual counterparty. The Company monitors the creditworthiness of its customers to which it grants credit terms in the normal course of business. If certain customers are independently rated, these ratings are used. Otherwise, if there is no independent rating, risk control assesses the credit quality of the customer, taking into account its financial position, past experience and other factors. Individual risk limits are set based on internal and external ratings in accordance with limits set by management. The utilization of credit limits is regularly monitored. Sales to customers are primarily settled in cash, which mitigates credit risk. At December 31, 2020 and 2019, no customer represented more than 10% of trade accounts receivable, net. Any remaining concentrations of credit risk with respect to trade receivables are limited due to the large number of customers and their dispersion across many geographic areas. The Company’s investments in debt instruments primarily include U.S. Treasury Bonds and long-term receivables towards government bodies. As such, they are investments with immaterial expected credit loss. Any remaining receivable is of low credit risk and is individually not significant. The credit ratings of the investments are monitored for credit deterioration. Liquidity risk Prudent liquidity risk management includes maintaining sufficient cash and cash equivalents, short-term deposits and marketable securities, the availability of funding from committed credit facilities and the ability to close out market positions. The Company’s objective is to maintain a significant cash position and a low debt-to-equity ratio, which ensures adequate financial flexibility. Liquidity management policy is to finance the Company’s investments with net cash from operating activities. Management monitors rolling forecasts of the Company’s liquidity reserve based on expected cash flows. 2 8 .2 Capital risk management The Company’s objectives when managing capital are to safeguard the Company’s ability to continue as a going concern in order to create value for shareholders and benefits and returns for its stakeholders, as to maintain an optimal capital structure. In order to maintain or adjust its capital structure, the Company may review the amount of dividends paid to shareholders, return capital to shareholders, or issue new shares. Consistent with others in the industry, the Company monitors capital on the basis of the net debt-to-equity ratio . This ratio is calculated as the net financial position of the Company, defined as the difference between total cash position (cash and cash equivalents, short-term deposits, marketable securitie s and restricted cash, if any) and total financial debt ( short term and long-term debt), divided by total parent company stockholders’ equity . 2 8 .3 Fair value measurement The fair value of financial instruments traded in active markets is based on quoted market prices at the balance sheet date. The quoted market price used for financial assets held by the Company is the bid price. If the market for a financial asset is not active and if no observable market price is obtainable, the Company measures fair value by using significant assumptions and estimates. When measuring fair value, the Company makes maximum use of market inputs and minimizes the use of unobservable inputs. The table below details financial assets (liabilities) measured at fair value on a recurring basis as at December 31, 2020: Fair Value Measurements using December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Marketable securities – U.S. Treasury debt securities 133 133 — — Short-term deposits 581 581 — — Equity securities measured at fair value through earnings 25 25 — — Derivative assets designated as cash flow hedge 55 — 55 — Derivative assets not designated as cash flow hedge 10 — 10 — Derivative liabilities designated as cash flow hedge — — — — Derivative liabilities not designated as cash flow hedge (2 ) — (2 ) — Contingent consideration on business acquisitions (123 ) — — (123 ) Total 679 739 63 (123 ) The table below details financial assets (liabilities) measured at fair value on a recurring basis as at December 31, 2019: Fair Value Measurements using December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Marketable securities – U.S. Treasury debt securities 133 133 — — Short-term deposits 4 4 — — Equity securities measured at fair value through earnings 23 23 — — Derivative assets designated as cash flow hedge 5 — 5 — Derivative assets not designated as cash flow hedge 3 — 3 — Derivative liabilities designated as cash flow hedge (6 ) — (6 ) — Derivative liabilities not designated as cash flow hedge (1 ) — (1 ) — Total 161 160 1 — For liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3), the reconciliation between January 1, 2020 and December 31, 2020 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2020 — Contingent consideration on business combinations 117 Changes in fair value measurement 1 Currency translation adjustment 5 December 31, 2020 123 Amount of total losses for the period included in earnings attributable to liabilities still held at the reporting date 1 Contingent consideration reported as noncurrent liabilities on the consolidated balance sheet as at December 31, 2020 is based on the probability that the milestones defining the variable components of the consideration will be achieved. No asset (liability) was measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as at December 31, 2019. No asset (liability) was measured at fair value on a non-recurring basis using significant unobservable inputs (Level 3) as at December 31, 2020 and December 31, 2019 respectively. In 2020, the Company closed the acquisition of French Gallium Nitride (GaN) innovator Exagan and the acquisitions of the entire share capital of Ultra Wide Band specialist BeSpoon, of the cellular IoT connectivity assets of Riot Micro and of the radio-frequency assets of Somos, as detailed in Note 7. For these acquisitions, the purchase price allocation on the assets acquired and liabilities assumed, measured at fair value, was determined by the Company with the assistance of an independent third party. This corresponded to a Level 3 fair value measurement hierarchy. The main assets that were identified separately corresponded to technologies and amounted to $118 million. The fair value of the intangible assets was determined using the multi-period excess earnings method, consisting in discounting at a discount rate, which approximates 9%, the future earnings attributable to the asset. On August 4, 2020, the Company issued a $1.5 billion principal amount of dual tranche senior unsecured convertible bonds (Tranche A and Tranche B for $750 million each tranche), due 2025 and 2027, respectively. Proceeds were allocated between debt and equity by measuring first the liability component and then determining the equity component as a residual amount. The liability component was measured at fair value based on a discount rate adjustment technique (income approach), which corresponded to a Level 3 fair value hierarchy measurement. The fair value of the liability component at initial recognition totaled $1,362 million before allocation of issuance costs and deferred tax effect, and was estimated by calculating the present value of cash flows using a discount rate of 1.30% and 1.85%, respectively, on each tranche. These applied discount rates were determined to be consistent with the market rates at the time for similar instruments with no conversion rights. The call option available to the Company for the early redemption of Tranche A of the senior unsecured convertible bonds issued on July 3, 2017 was exercised in July 2020. As a consequence, bondholders exercised their conversion rights on Tranche A. The Company allocated the total consideration transferred between debt and equity by measuring at fair value the liability component of Tranche A prior to settlement, then determining the equity component as a residual amount. The liability component was measured at fair value based on a discount rate adjustment technique (income approach), which corresponded to a Level 3 fair value hierarchy measurement and consisted in calculating the present value of cash flows using an average estimated discount rate of 0.8%, which fairly approximated current market rates for similar bonds that have no conversion rights. Further description on the senior unsecured convertible bonds issued by the Company is provided in Note 15. The Company evaluated in 2020, 2019 and 2018 for impairment the aggregate carrying amount of long-term investments for which the Company applies the cost method as a measurement alternative, as described in Note 2.2 4 . A $ 1 million impairment charge was recorded on these investments in 2020, reported on the line “Loss on financial instruments, net” of the consolidate d statement of income. No significant impairment charge was recorded on these investments in 201 9 and 201 8 . The following table includes additional fair value information on financial assets and liabilities as at December 31, 2020 and 2019: 2020 2019 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Cash equivalents (1) 1 2,637 2,637 1,691 1,691 Short-term, deposits 1 581 581 4 4 Long-term debt – Bank loans (including current portion) 2 583 583 718 718 – Senior unsecured convertible bonds issued on July 3, 2017 (Tranche A) (2) 1 — — 700 1,030 – Senior unsecured convertible bonds issued on July 3, 2017 (Tranche B) (3) 1 674 1,359 654 1,073 – Senior unsecured convertible bonds issued on August 4, 2020 (4) 1 1,364 1,835 — — (1) (2) (3) (4) There were no debt securities that were in an unrealized loss position as at December 31, 2020 and December 31, 2019. The methodologies used to estimate fair value are as follows: Components Methodology used to estimate fair value Debt securities classified as available-for-sale Quoted market prices for identical instruments Foreign exchange forward contracts, currency options and collars Quoted market prices for similar instruments Equity securities measured at fair value through earnings Quoted market prices for identical instruments Equity securities carried at cost as a measurement alternative Valuation of the underlying investments on a new round of third-party financing or upon liquidation Long-term debt and current portion of long-term debt Future cash flows on a borrowing-by-borrowing basis and discounting these future cash flows using the Company's incremental borrowing rates for similar types of borrowing arrangements Cash and cash equivalents, accounts receivable, short-term borrowings, and accounts payable The carrying amounts reflected in the consolidated financial statements are considered as reasonable estimates of fair value due to the relatively short period of time between the origination of the instruments and their expected realization.

Related Party Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	2 9 . RELATED PARTY TRANSACTIONS Transactions with significant shareholders, their affiliates and other related parties were as follows: December 31, December 31, December 31, 2020 2019 2018 Sales & other services 5 2 — Other purchases 21 18 15 Accounts receivable 1 — 2 Accounts payable — — 52 For the years ended December 31, 2020, 2019 and 2018, the related party transactions were primarily with companies in which management of the Company perform similar policymaking functions. These include, but are not limited to: Orange, Telecom Italia and Idemia France. For the years ended December 31, 2020 and 2019, the Company did not report any material transaction with its equity-method investments. For the year ended December 31, 2018, the accounts payable amount reported in the table above primarily relates to ST-Ericsson SA, a former equity-method investment of the Company, which was wound down in 2019. The Company made a contribution of $0.5 million for the year ended December 31, 2020, $0.4 million for the year ended December 31, 2019 and $0.5 million for each of the year ended December 31, 2018 to the ST Foundation, a non-profit organization established to deliver and coordinate independent programs in line with its mission. Certain members of the Foundation’s Board are senior members of the Company’s management.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
Valuation and Qualifying Accounts	Dec. 31, 2020
Valuation And Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	STMICROELECTRONICS N.V. VALUATION AND QUALIFYING ACCOUNTS Valuation and qualifying accounts deducted from the related asset accounts Balance at beginning of period Translation adjustment Charged to costs and expenses Additions/ (Deductions) Balance at end of period (Currency—millions of U.S. dollars) 2020 Accounts Receivable 16 — — — 16 Deferred Tax Assets 1,534 28 (11 ) (913 ) 638 2019 Accounts Receivable 15 — — 1 16 Deferred Tax Assets 1,548 (4 ) — (10 ) 1,534 2018 Accounts Receivable 15 — — — 15 Deferred Tax Assets 1,502 (16 ) 143 (81 ) 1,548

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
Accounting Policies (Policies)	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of consolidation	2.1 - Principles of consolidation The Company's consolidated financial statements include the assets, liabilities, results of operations and cash flows of its majority-owned subsidiaries. Subsidiaries are fully consolidated from the date on which control is transferred to the Company. They are deconsolidated from the date that control ceases. Intercompany balances and transactions have been eliminated in consolidation. The Company assesses each investment in equity securities to determine whether the investee is a Variable Interest Entity (“VIE”). The Company consolidates the VIEs for which the Company is determined to be the primary beneficiary. The primary beneficiary of a VIE is the party that: (i) has the power to direct the most significant activities of the VIE and (ii) is obligated to absorb losses or has the rights to receive returns that would be considered significant to the VIE. Assets, liabilities, and the noncontrolling interest of newly consolidated VIEs are initially measured at fair value in the same manner as if the consolidation resulted from a business combination. When the Company owns some, but not all, of the voting stock of a consolidated entity, the shares held by third parties represent a noncontrolling interest. The consolidated financial statements are prepared based on the total amount of assets and liabilities and income and expenses of the consolidated subsidiaries. However, the portion of these items that does not belong to the Company’s shareholders is reported on the line “Noncontrolling interest” in the consolidated financial statements.
Use of estimates	2.2 - Use of estimates The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. The primary areas that require significant estimates and judgments by management include, but are not limited to: • sales returns and allowances, • inventory obsolescence reserves and normal manufacturing capacity thresholds to determine costs capitalized in inventory, • recognition and measurement of loss contingencies, • valuation at fair value of assets acquired, including intangibles, goodwill, investments and tangible assets, and liabilities assumed, including deferred and contingent consideration on business acquisitions, • annual and trigger-based impairment review of goodwill and intangible assets, as well as the assessment of events which could trigger impairment testing on long-lived assets, • assumptions used in measuring expected credit losses and impairment charges on financial assets, • recognition and measurement of restructuring charges and other exit costs; • assumptions used in assessing the number of awards expected to vest on stock-based compensation plans, • assumptions used in calculating pension obligations and other long-term employee benefits, • allocation between debt and equity of the various components of an issued, or settled, hybrid instrument and measurement at fair value of the liability component based on the income approach, and • determination of the amount of tax expected to be paid and tax benefit expected to be received, including deferred income tax assets, valuation allowance and provisions for uncertain tax positions and claims. The Company bases the estimates and assumptions on historical experience and on various other factors such as market trends, market information used by market participants and the latest available business plans that it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities. COVID-19 pandemic did not result in significant impacts on these estimates. While the Company regularly evaluates its estimates and assumptions, the actual results experienced by the Company could differ materially and adversely from those estimates.
Foreign currency	2.3 - Foreign currency The U.S. dollar is the reporting currency of the Company. The U.S. dollar is the currency of the primary economic environment in which the Company operates, since the worldwide semiconductor industry uses the U.S. dollar as a currency of reference for actual pricing in the market. Furthermore, the majority of the Company’s transactions are denominated in U.S. dollars, and revenues from external sales in U.S. dollars largely exceed revenues in any other currency. However, certain significant costs are incurred in the countries of the Eurozone and other non-U.S. dollar currency areas. The functional currency of each subsidiary of the Company is either the local currency or the U.S. dollar, depending on the basis of the economic environment in which each subsidiary operates. Foreign currency transactions, including operations in local currency when the U.S. dollar is the functional currency, are measured into the functional currency using the prevailing exchange rate. Foreign exchange gains and losses resulting from the re-measurement at reporting date of monetary assets and liabilities denominated in currencies other than the functional currency are recognized in the consolidated statements of income on the line “Other income and expenses, net”. For consolidation purposes, the results and financial position of the subsidiaries whose functional currency is different from the U.S. dollar are translated into the reporting currency as follows: (a) assets and liabilities for each consolidated balance sheet presented are translated at the closing exchange rate as of the balance sheet date; (b) income and expenses for each consolidated statement of income presented are translated at the average monthly exchange rate; (c) the resulting exchange differences are reported as Currency Translation Adjustments (“CTA”), a component of “Other comprehensive income (loss)” in the consolidated statements of comprehensive income.
Cash and cash equivalents	2.4 – Cash and cash equivalents Cash and cash equivalents include cash on hand, deposits held at call with external financial institutions and other short-term highly liquid investments with original maturities of three months or less. They are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
Trade accounts receivable	2.5 - Trade accounts receivable Trade accounts receivable are amounts due from customers for goods sold and services rendered to third parties in the ordinary course of business. Prior to the adoption of the new ASC 326 guidance on January 1, 2020, the Company reported trade accounts receivable net of allowance for doubtful accounts. The Company evaluated its customers’ financial condition periodically and recorded an allowance for any specific account it considered as doubtful. Additionally, the Company maintained an allowance for doubtful accounts for estimated losses resulting from its customers’ inability to make required payments. The carrying amount of the receivable was thus reduced by an allowance account, and the amount of the corresponding charge was recognized in the line “Selling, general and administrative” in the consolidated statements of income. Subsequent recoveries, if any, of amounts previously provided for were credited against the same line in the consolidated statements of income. When a trade receivable was uncollectible, it was written-off against the allowance account for trade accounts receivable. With the adoption of ASC 326 guidance starting January 1, 2020, the Company uses a lifetime expected losses allowance for all trade receivables. The allowance includes reasonable assumptions about future credit trends. The historical loss rates are adjusted to reflect current and forward-looking information on macroeconomic factors affecting the ability of the Company’s customers to settle the receivables. Adjustments to the expected credit losses allowance are reported on the line “Selling, general and administrative” in the consolidated statements of income and write-offs, if any, are recorded against the expected credit losses allowance, consistent with prior guidance. In the event of transfers of receivables such as factoring, the Company derecognizes the receivables only to the extent that the Company has surrendered control over the receivables in exchange for a consideration other than beneficial interest in the transferred receivables.
Inventories	2.6 – Inventories Inventories are stated at the lower of cost and net realizable value. Cost is based on the weighted average cost by adjusting standard cost to approximate actual manufacturing costs on a quarterly basis; the cost is therefore dependent on the Company’s manufacturing performance. In the case of underutilization of manufacturing facilities, the costs associated with unused capacity are not included in the valuation of inventories but charged directly to cost of sales. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company performs, on a continuous basis, write-offs of finished products, which have the characteristics of slow-moving, old production dates and technical obsolescence. The Company evaluates its inventory to identify obsolete or slow-selling items, as well as inventory that is not of saleable quality and records a specific reserve if the Company estimates the inventory will eventually become obsolete. Reserve for obsolescence is estimated for excess uncommitted inventory based on the previous quarters sales, order backlog and production plans.
Income taxes	2.7 - Income taxes Income tax for the period comprises current and deferred income tax. Current income tax represents the income tax expected to be paid or the tax benefit expected to be received related to the current year taxable profit and loss in each tax jurisdiction. Deferred income tax is recognized, using the liability method, for all temporary differences arising between the tax bases of assets and liabilities and their carrying amount in the consolidated financial statements. Deferred tax liabilities are not recognized on the initial recognition of goodwill as a result of a business combination. Deferred income tax is determined using tax rates and laws that are enacted at the balance sheet date and are expected to apply when the related deferred income tax asset is realized or the deferred income tax liability is settled. The effect on deferred tax assets and liabilities from changes in tax laws and tax rates is recognized on the line “Income tax benefit (expense)” in the consolidated statements of income in the period in which the law is enacted. Deferred income tax assets are recognized in full but the Company assesses whether future taxable profit will be available against which temporary differences can be utilized. A valuation allowance is provided for deferred tax assets when management considers it is more likely than not that they will not be realized. The Company recognizes a deferred tax liability on undistributed earnings of subsidiaries when there is a presumption that taxable earnings will be remitted to the parent. A deferred tax asset is recognized on compensation for the grant of stock awards to the extent that such charge constitutes a temporary difference in the subsidiaries’ local tax jurisdictions. Changes in the stock price do not result in any adjustments to the deferred tax asset prior to vesting. At each reporting date, the Company assesses all significant income tax positions in all tax jurisdictions to determine any uncertain tax positions. The Company uses a two-step process for the evaluation of uncertain tax positions. The first step consists in assessing whether the tax benefit must be recognized. The second step consists in measuring the amount of tax benefit to be recognized on each uncertain tax position. In step 1 (recognition), the Company assesses whether a tax position, based solely on its technical merits, is more likely than not to be sustained upon examination. Only tax positions with a sustainability threshold higher than 50% are recognized. In Step 2 (measurement), the Company determines the amount of recognizable tax benefit. The measurement methodology is based on a “cumulative probability” approach, resulting in the recognition of the largest amount that is greater than 50% likely of being realized upon settlement with the taxing authority. The Company accrues for interest and penalties on uncertain tax liabilities reported on the consolidated balance sheets. Interests and penalties are classified as components of income tax expense in the consolidated statements of income.
Assets held for sale	2.8 – Assets held for sale Asset groups are classified as assets held for sale when their carrying amount is to be recovered principally through a sale transaction rather than through continuing use. The asset groups are classified as assets held for sale when the following main conditions have been met: management has approved the plan to sell; assets are available for immediate sale; assets are actively being marketed; sale is probable of occurring within one year; price is reasonable in the market and it is unlikely that there will be significant changes in the assets to be sold or a withdrawal to the plan to sell. Asset groups classified as held for sale are reported as current assets in the consolidated balance sheets at the lower of their carrying amount and fair value less costs to sell. Long-lived assets classified as held for sale are no longer depreciated. When the held-for-sale accounting treatment requires an impairment charge for the difference between the carrying amount and fair value, such impairment is reflected on the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs”.
Business combinations and goodwill	2.9 – Business combinations and goodwill The acquisition method of accounting is applied to all business combinations. The identifiable assets acquired, liabilities assumed, and equity instruments issued are measured at fair value on the acquisition date. Any contingent purchase price and acquired contingencies are recorded at fair value on the acquisition date and remeasured at each reporting date. Acquisition-related transaction costs and restructuring costs relating to the acquired business are expensed as incurred. Acquired in-process research and development (“IPR&D”) is capitalized and recorded as an intangible asset on the acquisition date, subject to impairment testing until the research or development is completed or abandoned. The excess of the consideration transferred over the acquisition-date fair value of the identifiable assets acquired and liabilities assumed, net of related deferred tax impacts, is recorded as goodwill. In case of a bargain purchase, the Company reassesses whether it has correctly identified all of the assets acquired and all of the liabilities assumed, the noncontrolling interest in the acquiree, if any, the Company’s previously held equity interest in the acquiree, if any, and the consideration transferred. If after this review, a bargain purchase is still indicated, it is recognized in earnings attributable to parent company stockholders. The purchase of additional interests in a partially owned subsidiary is treated as an equity transaction as well as all transactions concerning the sale of subsidiary stock or the issuance of stock by the partially owned subsidiary, as long as there is no change in control of the subsidiary. If as a consequence of selling subsidiary shares, the Company no longer controls the subsidiary, the Company recognizes a gain or loss in earnings. Goodwill is carried at cost less accumulated impairment losses, if any. Goodwill is not amortized but is tested annually for impairment, or more frequently if indicators of impairment exist. Goodwill subject to potential impairment is tested at the reporting unit level. The impairment test determines whether the fair value of each reporting unit under which goodwill is allocated is lower than the total carrying amount of relevant net assets allocated to such reporting unit, including its allocated goodwill. Before the adoption on January 1, 2020 of the new guidance which simplifies the accounting for goodwill impairment, the implied fair value of the reporting unit goodwill was compared to the carrying value of the goodwill and an impairment charge was recognized for any excess in the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs”. With the adoption of the new guidance effective on January 1, 2020, this hypothetical purchase price allocation is not required and a goodwill impairment charge, if any, is recorded for the amount by which a reporting unit’s carrying value exceeds its fair value. Significant management judgments and estimates are used in forecasting the future discounted cash flows associated with the reporting unit, including: the applicable industry’s sales volume forecast and selling price evolution, the reporting unit’s market penetration and its revenues evolution, the market acceptance of certain new technologies and products, the relevant cost structure, the discount rates applied using a weighted average cost of capital and the perpetuity rates used in calculating cash flow terminal values.
Intangible assets with definite useful lives	2.10 – Intangible assets with definite useful lives Intangible assets subject to amortization include the intangible assets purchased from third parties recorded at cost and intangible assets acquired in business combinations initially recorded at fair value. Amortization begins when the intangible asset is available for its intended use. Amortization reflects the pattern in which the asset’s economic benefits are consumed, which usually consists in applying the straight-line method to allocate the cost of the intangible assets over the estimated useful life. The carrying value of intangible assets with definite useful lives is evaluated whenever changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized in the consolidated statements of income on the line “Impairment, restructuring charges and other related closure costs” for the amount by which the asset’s carrying amount exceeds its fair value. The Company evaluates the remaining useful life of an intangible asset at each reporting date to determine whether events and circumstances warrant a revision to the remaining period of amortization. Technologies and licenses Separately acquired technologies and licenses are recorded at historical cost. Technologies and licenses acquired in a business combination are initially recognized at fair value at the acquisition date. Technologies and licenses have a useful life which usually ranges from 3 to 8 years and are carried at cost less accumulated amortization and impairment losses, if any. Computer software Separately acquired computer software is recorded at historical cost. Costs associated with maintaining computer software programs are expensed as incurred and reported as “Cost of sales”, “Selling, general and administrative”, or “Research and development” in the consolidated statements of income according to their intended use. The capitalization of costs for internally generated software developed by the Company for its internal use begins when the preliminary project stage is completed and when the Company, implicitly or explicitly, authorizes and commits to funding a computer software project. It must be probable that the project will be completed and will be used to perform the function intended. Amortization of computer software begins when the software is available for its intended use and is calculated using the straight-line method
Property, plant and equipment	2.11 – Property, plant and equipment Property, plant and equipment are stated at historical cost, net of accumulated depreciation and any impairment losses. Property, plant and equipment acquired in a business combination are initially recognized at fair value at the acquisition date. Land is not depreciated. Depreciation on fixed assets is computed using the straight-line method over their estimated useful lives, as follows: Buildings 33 years Facilities and leasehold improvements 5-10 years Machinery and equipment 2-10 years Computer and R&D equipment 3-6 years Other 2-5 years The Company evaluates each period whether there is reason to suspect that tangible assets or groups of assets held and used might not be recoverable. Several impairment indicators exist for making this assessment, such as: restructuring plans, significant changes in the technology, market, economic or legal environment in which the Company operates, available evidence of obsolescence of the asset, or indication that its economic performance is, or will be, worse than expected. In determining the recoverability of assets to be held and used, the Company initially assesses whether the carrying value of the tangible assets or group of assets exceeds the undiscounted cash flows associated with these assets . If exceeded, the Company then evaluates whether an impairment charge is required by determining if the asset’s carrying value also exceeds its fair value . This fair value is normally estimated by the Company based on independent market appraisals or the sum of discounted future cash flows, using market assumptions such as the utilization of the Company’s fabrication facilities and the ability to upgrade such facilities, change in the selling price and the adoption of new technologies . At each reporting date or when impairment indicators are identified, t he Company also evaluates, and adjusts if appropriate, the assets’ useful lives . When property, plant and equipment are retired or otherwise disposed of, the net book value of the assets is removed from the Company’s books. Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are included in “Other income and expenses, net” in the consolidated statements of income.
Leases	2.12 – Leases The Company recognizes lease arrangements on the consolidated balance sheet as right-of-use assets as a category within “Property, plant and equipment, net”. For income statement purposes, leases are classified as either operating or finance leases. Lease arrangements in which the Company has substantially all the risks and rewards of ownership are classified as finance leases. Operating lease expenses are recognized in the consolidated statements of income, on a straight-line basis over the lease period and reported as “Cost of sales”, “Selling, general and administrative”, or “Research and development”, according to the intended use of the leased asset. A lease contract is a contract, or part of a contract, that conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use assets within the line “Property, plant and equipment, net” on the consolidated balance sheets. Current operating lease liabilities are included in the line “Other payables and accrued liabilities”, while noncurrent operating lease liabilities are included in the line “Other long-term liabilities” on the Company’s consolidated balance sheets. Finance leases are included in the line “Property, plant and equipment, net” and “Long-term debt” on the consolidated balance sheets. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. The right-of-use asset is a nonmonetary asset while the lease liability is a monetary liability. When accounting for a lease that is denominated in a foreign currency, the lease liability is remeasured using the current exchange rate, while the right-of-use asset is measured using the historical exchange rate as of the commencement date. Certain lease contracts contain options to extend the lease. On these contracts, t commencement date only. Additionally, lease contracts with a sum of lease payments not exceeding $5,000 are The Company does not separate lease and non-lease components and instead accounts for each separate lease component and the non-lease components associated with that lease component as a single lease component. Variable lease payments that depend on an index or a rate are included in the lease payments and are measured using the prevailing index or rate at the measurement date. Changes to index and rate-based variable lease payments are recognized in earnings in the period of the change. The rate implicit in the lease should be used whenever that rate is readily determinable. In most cases, this rate is not readily determinable and the Company uses its incremental borrowing rate, which is derived from information available at the lease commencement date, in determining the present value of lease payments. The Company gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates.
Loss contingencies	2.1 3 – Loss contingencies In determining loss contingencies, the Company considers the likelihood of the incurrence of a liability as well as the ability to reasonably estimate the amount of such loss or liability. An estimated loss from a loss contingency is accrued when information available indicates that it is probable that a liability has been incurred at the date of the consolidated financial statements and when the amount of the loss can be reasonably estimated.
Long-term debt	2.1 4 – Long-term debt (a) Convertible debt The Company evaluates, at initial recognition of a convertible debt, the different components and features of the hybrid instruments and determines whether certain elements are embedded derivative instruments which require bifurcation. Components of convertible debt instruments that may be settled in cash upon conversion based on a net-share settlement basis are accounted for separately as long-term debt and equity when the conversion feature of the convertible bonds constitute an embedded equity instrument. When an equity instrument is identified, proceeds from issuance are allocated between debt and equity by measuring first the liability component and then determining the equity component as a residual amount. The liability component is measured as the fair value of a similar nonconvertible debt, which results in the recognition of a debt discount. In subsequent periods, the Company amortizes the debt discount through earnings on the line “Interest income (expense), net” of the consolidated statements of income, using the effective interest method, based on the contractual maturity of the debt. The equity component, reported on the line “Additional Paid-in Capital” of the consolidated statement of equity, is not remeasured. Deferred taxes are recognized on the difference between the carrying amount of the liability component and its tax basis. Debt issuance costs are reported as a deduction of debt. They are subsequently amortized through earnings on the line “Interest income (expense), net” of the consolidated statements of income, using the effective interest rate method. In case of conversion from the bondholders, the fair value of the consideration transferred is allocated between the liability component and the equity component. The difference between the carrying amount of the debt at the settlement date and the fair value of the debt component is recorded in earnings as a loss on debt extinguishment and reported on the line “Loss on financial instruments, net” of the consolidated statements of income. The liability component is measured as the fair value of a similar nonconvertible debt prior to settlement. The reacquired equity component is recorded in equity and reported on the line “Additional Paid-in Capital” of the consolidated statement of equity. (b) Bank loans Bank loans and non-convertible senior bonds are recognized at the amount of cash proceeds received, net of debt issuance costs incurred. They are subsequently reported at amortized cost; any difference between the proceeds (net of debt issuance costs) and the principal amount is recognized through earnings on the line “Interest income (expense), net” of the consolidated statements of income over the period of the borrowings using the effective interest method.
Employee benefits	2.15– Employee benefits (a) Pension obligations The Company sponsors various pension schemes for its employees. These schemes conform to local regulations and practices in the countries in which the Company operates. Such plans include both defined benefit and defined contribution plans. For defined benefit pension plans, the liability recognized in the consolidated balance sheets is the present value of the defined benefit obligation at the balance sheet date less the fair value of plan assets. The overfunded or underfunded status of the defined benefit plans are calculated as the difference between plan assets and the projected benefit obligations. Estimates are used in determining the assumptions incorporated in the calculation of the pension obligations, which is supported by input from independent actuaries. Actuarial gains and losses arising from changes in actuarial assumptions are recognized in “Accumulated Other Comprehensive Income (Loss)” in the consolidated statements of equity and are charged or credited to earnings over the employees’ expected average remaining working lives. Past service costs are recognized in “Accumulated Other Comprehensive Income (Loss)” in the consolidated statements of equity and are amortized on a straight-line basis over the vesting period. The net periodic benefit cost of the year is determined based on the assumptions used at the end of the previous year . Past service costs are recognized in earnings on the line “Other components of pension benefit costs” of the consolidated statements of income if the changes to the pension scheme are not conditional on the employees remaining in service for a specified period (the vesting period) . For defined contribution pension plans, the Company pays contributions to publicly or privately administered pension insurance plans on a mandatory, contractual or voluntary basis. The Company has no further payment obligations once the contributions have been paid. The contributions are recognized as employee benefit expense when they are due. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in the future payments is available. The service cost component of net periodic benefit costs is presented in the same income statement line as other employee compensation costs arising from services rendered during the period. The other components of the net periodic benefit cost are presented separately, outside operating income, on the line “Other components of pension benefit costs” of the consolidated statements of income. These elements include: interest cost; expected return on plan assets; amortization of transition (asset) obligation; amortization of prior service cost; amortization of net (gain) loss; (gain) loss recognized due to curtailment or settlement and; cost of special termination benefits. (b) Other post-employment obligations The Company provides post-employment benefits to some of its retirees. The entitlement to these benefits is usually conditional on the employee remaining in service up to retirement age and on the completion of a minimum service period. The expected costs of these benefits are accrued over the period of employment using an accounting methodology similar to that for defined benefit pension plans. Actuarial gains and losses arising from changes in actuarial assumptions are charged or credited to earnings over the expected average remaining working lives of the related employees. (c) Termination benefits Termination benefits are payable when an employee is involuntarily terminated, or whenever an employee accepts voluntary termination in exchange for termination benefits. For the accounting treatment and timing recognition of involuntary termination benefits, the Company distinguishes between one-time termination benefit arrangements and ongoing termination benefit arrangements. A one-time termination benefit arrangement is established by a termination plan and applies to a specified termination event. One-time involuntary termination benefits are recognized as a liability when the termination plan meets certain criteria and has been communicated to employees. If employees are required to render future service in order to receive these one-time termination benefits, the liability is recognized ratably over the future service period. Termination benefits other than one-time termination benefits are termination benefits for which the communication criterion is not met but that are committed to by management, or termination obligations that are not specifically determined in a new and single plan. These termination benefits are all legal, contractual and past practice termination obligations to be paid to employees in case of involuntary termination. These termination benefits are accrued for when commitment creates a present obligation to others for the benefits expected to be paid, when it is probable that employees will be entitled to the benefits and the amount can be reasonably estimated. In case of special termination benefits related to voluntary redundancy programs, the Company recognizes a provision for voluntary termination benefits at the date on which the employee irrevocably accepts the offer and the amount can be reasonably estimated. (d) Profit-sharing and bonus plans The Company recognizes a liability and an expense for bonuses and profit-sharing plans when a contractual obligation exists or where there is a past practice that has created a present obligation. (e) Other long-term employee benefits The Company provides long-term employee benefits such as seniority awards in certain countries. The entitlement to these benefits is usually conditional on the employee completing a minimum service period. The expected costs of these benefits are accrued over the period of employment. Actuarial gains and losses arising from changes in actuarial assumptions are charged or credited to earnings in the period of the revised estimate. These obligations are valued annually with the assistance of independent qualified actuaries. (f) Share-based compensation The Company grants unvested stock awards to senior executives and selected employees. The awards granted to employees vest over a three-year measures the cost of the awards based on the grant-date fair value of the awards, reflecting the market price of the underlying shares at the date of the grant, reduced by the present value of the dividends expected to be paid on the shares during the requisite service period. That cost is recognized using graded vesting over the period during which an employee is required to provide service in exchange for the award or the requisite service period. The compensation cost is recorded through earnings with the corresponding amount reported in equity, under “Additional Paid-in Capital” in the consolidated statements of equity. The compensation cost is calculated based on the number of awards expected to vest, which includes assumptions on the number of awards to be forfeited due to the employees failing to fulfill the service condition and forfeitures following the non-completion of one or more performance conditions. Compensation is recognized only for the awards that ultimately vest. Liabilities for the Company’s portion of payroll taxes are recognized at vesting, which is the event triggering the payment of the social contributions in most of the Company’s local tax jurisdictions. Employee-related social charges are measured based on the intrinsic value of the share and recorded at vesting date.
Share capital	2.1 6 – Share capital Ordinary shares are classified as “Common stock” within equity on the consolidated balance sheets. Incremental costs directly attributable to the issuance of new shares or options are shown in equity as a deduction, net of tax, from the proceeds received. Where the Company purchases its own equity share capital (treasury stock), the consideration paid, including any directly attributable incremental costs (net of income taxes), is deducted from parent company stockholders’ equity until the shares are cancelled, reissued, or disposed of.
Comprehensive income (loss)	2.1 7 – Comprehensive income (loss) Comprehensive income (loss) is defined as the change in equity of a business during a period except those changes resulting from investment by and distributions to stockholders. In the consolidated financial statements, "Other comprehensive income (loss)" and “Accumulated other comprehensive income” primarily consists of foreign currency translation adjustments, unrealized gains (losses) on debt securities classified as available-for-sale, unrealized gains (losses) on derivatives designated as cash flow hedge and the accounting for defined benefit plans as described in Note 2.15, net of tax.
Revenue recognition	2.1 8 – Revenue recognition A rrangements with customers are considered contracts if all the following criteria are met: (a) parties have approved the contract and are committed to perform their respective obligations; (b) each party’s rights regarding the goods or services to be transferred can be identified; (c) payment terms for the goods or services to be transferred can be identified; (d) the contract has commercial substance and (e) collectability of substantially all of the consideration is probable. The Company recognizes revenue from products sold to a customer, including distributors, when it satisfies a performance obligation by transferring control over a product to the customer. In certain circumstances, the Company may enter into agreements that concern principally revenues from services, where the performance obligation is satisfied over time. The objective when allocating the transaction price is to allocate the transaction price to each performance obligation (or distinct good or service) in an amount that depicts the amount of consideration to which the Company expects to be entitled in exchange for transferring the promised goods or services to the customer. The payment terms typically range between 30 and 90 days. Consistent with standard business practice in the semiconductor industry, price protection is granted to distribution customers on their existing inventory of the Company’s products to compensate them for declines in market prices . The Company accrues a provision for price protection based on a rolling historical price trend computed monthly as a percentage of gross distributor sales . This historical price trend represents differences in recent months between the invoiced price and the final price to the distributor, adjusted to accommodate a significant change in the selling price . The short outstanding inventory time , visibility into the inventory product pricing and long distributor pricing history have enabled the Company to reliably estimate price protection provisions at period-end . The Company records the accrued amounts as a deduction of “Net sales” in the consolidated statements of income at the time of the sale . The Company’s customers occasionally return the Company’s products for technical reasons. The Company’s standard terms and conditions of sale provide that if the Company determines that products do not conform, the Company will repair or replace the non-conforming products, or issue a credit note or rebate of the purchase price. Quality returns are identified shortly after sale in customer quality control testing. Quality returns are usually associated with end-user customers, not with distribution channels. The Company records the accrued amounts as a The Company’s insurance policy relating to product liability covers third party physical damages and bodily injury, indirect financial damages as well as immaterial non-consequential damages caused by defective products. The Company records a provision for warranty costs as a charge against “Cost of sales” in the consolidated statements of income, based on historical trends of warranty costs incurred as a percentage of sales, which management has determined to be a reasonable estimate of the probable losses to be incurred for warranty claims in a period. Any potential warranty claims are subject to the Company’s determination that the Company is at fault for damages, and such claims usually must be submitted within a short period of time following the date of sale. This warranty is given in lieu of all other warranties, conditions or terms expressed or implied by statute or common law. The Company’s contractual terms and conditions typically limit its liability to the sales value of the products which gave rise to the claims. In addition to product sales, the Company enters into arrangements with customers consisting in transferring licenses or related to license services. The revenue generated from these arrangements are reported on the line “Other revenues” of the consolidated statements of income. Other revenues also include patent royalty income, sale of scrap materials and manufacturing by-products.
Public funding	2. 19 – Public funding The Company receives funding mainly from governmental agencies and income is recognized when all contractual conditions for receipt of these funds are fulfilled. The Company’s primary sources for government funding are French, Italian and other country governmental entities. Such funding is generally provided to encourage research and development activities, industrialization and local economic development. The conditions for receipt of government funding may include eligibility restrictions, approval by EU authorities, annual budget appropriations, compliance with European Commission regulations, as well as specifications regarding objectives and results. Certain specific contracts contain obligations to maintain a minimum level of employment and investment during a certain period. There could be penalties if these objectives are not fulfilled. Other contracts contain penalties for late deliveries or for breach of contract, which may result in repayment obligations. Funding related to these contracts is recorded when the conditions required by the contracts are met. The Company’s funding programs are classified under three general categories: funding for research, development and other innovative activities, capital investment, and loans. Funding for research, development and innovative activities is the most common form of funding that the Company receives. This public funding is recorded as “Other income and expenses, net” in the Company’s consolidated statements of income. The funding is recognized ratably as the related costs are incurred once the agreement with the respective governmental agency has been signed and all applicable conditions are met. French research tax credits (“Crédit Impôt Recherche”) and Italian research tax credits (“Credito d’Imposta Ricerca & Sviluppo”) are deemed to be grants in substance. The French research tax credits are to be paid in cash by the taxing authorities within three years in case they are not deducted from income tax payable during this period of time. The Italian tax credits are compensated against payroll-related social charges. French and Italian tax credits are reported as a reduction of “Research and development” in the consolidated statements of income. Capital investment funding is recorded as a reduction of “Property, plant and equipment, net” and is recognized in the Company’s consolidated statements of income by offsetting the depreciation charges of the funded assets during their useful lives . The Company also receives capital funding in Italy, which can be recovered through the reduction of various governmental liabilities, including income tax, value-added tax and employee-related social charges . Funding receivables are reported as non-current assets unless cash settlement features of the receivables evidence that collection is expected within one year. Long-term receivables that do not present any tax attribute or legal restriction are reflected in the consolidated balance sheets at their net present value when the discounting effect is deemed to be significant. The Company receives certain loans, mainly related to large capital investment projects, at preferential interest rates. The Company records these loans as “Long-term debt” in the consolidated balance sheets.
Research and development	2.2 0 – Research and development Research and development expenses include costs incurred by the Company, the Company’s share of costs incurred by other research and development interest groups, and costs associated with co-development contracts. Research and development expenses do not include marketing design center costs, which are accounted for as “Selling, general and administrative” in the consolidated statements of income and process engineering, pre-production or process transfer costs which are recorded as “Cost of sales” in the consolidated statements of income. Research and development costs are expensed as incurred. The amortization expense recognized on technologies and licenses purchased by the Company from third parties to facilitate the Company’s research is reported as “Research and development” in the consolidated statements of income.
Advertising costs	2.2 1 – Advertising costs Advertising costs are expensed as incurred and are recorded as “Selling, general and administrative” in the consolidated statements of income. Advertising expenses for 2020, 2019 and 2018 were $12 million, $17 million and $15 million, respectively.
Start-up and phase-out costs	2.2 2 – Start-up and phase-out costs Start-up costs represent costs incurred in the start-up, testing and qualification of the Company's newly integrated manufacturing facilities. The costs of phase-outs are associated with the latest stages of facilities closure when the relevant production volumes become immaterial. Start-up costs and phase-out costs are included in "Other income and expenses, net" in the consolidated statements of income.
Equity-method investments	2.23– Equity-method investments Equity-method investments are all entities over which the Company has the ability to exercise significant influence but not control, generally representing a shareholding of between 20% and 50% of the voting rights. These investments are valued under the equity-method and are initially recognized at cost. Goodwill on equity-method investments is included in the carrying value of the investment and is not individually tested for impairment. The Company’s share in the result of operations of equity-method investments is recognized in the consolidated statements of income on the line “Income (loss) on equity-method investments” and in the consolidated balance sheets as an adjustment to the carrying amount of the investments. The financial statements of the equity-method investments are prepared for the same reporting period as the Company or with a time lag not exceeding three months if the investee cannot issue consolidated financial statements within the closing timeframe requirements of the Company. At each period-end, the Company assesses whether there is objective evidence that its interests in equity-method investments are impaired. Once a determination is made that an impairment exists, the Company writes down the carrying value of the equity-method investment to its fair value at the balance sheet date, which establishes a new cost basis.
Investments in equity securities	2.24– Investments in equity securities Investments in equity securities that have readily determinable fair values and for which the Company does not have the ability to exercise significant influence are classified as equity securities measured at fair value through earnings. Changes in the fair value of these securities are reported in the consolidated statements of income within “Other income and expenses ” , net when these instruments are held within the Company’s operating activities. Gains and losses arising from changes in the fair value of securities not related to operating activities are presented in the consolidated statements of income as a non-operating element within “Gain (loss) on financial instruments, net” in the period in which they arise. For investments in equity securities without readily determinable fair values and for which the Company does not have the ability to exercise significant influence, the Company has elected to apply the cost method as a measurement alternative. Under the cost method of accounting, investments are carried at historical cost, less impairment, adjusted for subsequent observable price changes. An impairment loss is recorded when there are identified events or changes in circumstances that may have a significant adverse effect on the value of the investment. The loss is immediately recorded in the consolidated statements of income on the line “Loss on financial instruments, net” and is based on the Company’s assessment of any significant and sustained reductions in the investment’s value. Gains and losses on investments sold are determined on the specific identification method and are recorded as a non-operating element on the line “Gain (loss) on financial instruments, net” in the consolidated statements of income when the transaction is not related to operating activities. The fair values of quoted equity securities are based on current market prices. If the market for a financial asset is not active and if no observable market price is obtainable, the Company measures fair value by using assumptions and estimates. In measuring fair value, the Company makes maximum use of market inputs and minimizes the use of unobservable inputs.
Investments in debt securities	2.2 5 – Investments in debt securities The Company did not hold any debt securities classified as held-to-maturity or for which the Company would have elected to apply the fair value option. The Company’s debt securities are hence classified as available-for-sale and reported on the line “Marketable securities” on the consolidated balance sheets as at December 31, 2020 and 2019. Debt securities are included in current assets when they represent investments of funds available for current operations or when management intends to dispose of the securities within twelve months of the balance sheet date. Changes in fair value of debt securities classified as available-for-sale are recognized as a component of “Other comprehensive income (loss)” in the consolidated statements of comprehensive income. The Company assesses at each balance sheet date whether there is objective evidence that a debt security or group of debt securities classified as available-for-sale is impaired. An unrealized impairment loss exists when the fair value of the instrument declines below its amortized cost basis. An impairment loss is recognized in earnings, through a direct reduction of the value of the asset, when the Company intends to sell the debt security or when it is more likely than not that the Company will be required to sell the instrument before recovery of the amortized cost basis. Moreover, an impairment loss is recognized in earnings through a credit loss allowance for any portion of the unrealized impairment loss resulting from a credit loss. Impairment losses recognized in the consolidated statements of income are not reversed through earnings. The fair values of quoted debt securities are based on current market prices. If the market for a financial asset is not active and if no observable market price is obtainable, the Company measures fair value by using assumptions and estimates. In measuring fair value, the Company makes maximum use of market inputs and minimizes the use of unobservable inputs.
Derivative financial instruments and hedging activities	2.2 6 – Derivative financial instruments and hedging activities Derivative financial instruments are initially recognized on the date a derivative contract is entered into and are subsequently measured at fair value. The method of recognizing the gain or loss resulting from the derivative instrument depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the hedge transaction. The Company has designated certain derivatives as hedges of a particular risk associated with a highly probable forecasted transaction (cash flow hedge). The Company documents, at inception of the transaction, the relationship between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedging transactions. The Company also documents its assessment, both at hedge inception and on an ongoing basis, of whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items . Derivative instruments that are not designated as hedges are measured at fair value through earnings . Cash Flow Hedge As part of its ongoing operating, investing and financing activities, the Company enters into certain derivative transactions that may be designated and may qualify as hedging instruments. To reduce its exposure to U.S. dollar exchange rate fluctuations, the Company hedges certain Euro-denominated forecasted transactions that cover at reporting date a large part of its research and development, and selling, general and administrative expenses as well as a portion of its front-end manufacturing costs of semi-finished goods within cost of sales through the use of currency forward contracts and currency options, including collars. The Company also hedges through the use of currency forward contracts certain Singapore dollar-denominated manufacturing forecasted transactions. The derivative instruments are designated and qualify for cash flow hedge at inception of the contract and on an ongoing basis over the duration of the hedge relationship. They are reflected at their fair value as “Other current assets” or “Other payables and accrued liabilities” in the consolidated balance sheets. The criteria for designating a derivative as a hedge include the instrument’s effectiveness in risk reduction and a one-to-one matching of the derivative instrument to its underlying transaction with the critical terms of the hedging instrument matching the terms of the hedged forecasted transaction. This enables the Company to conclude that changes in cash flows attributable to the risk being hedged are expected to be substantially offset by the hedging instruments. For derivative instruments designated as cash flow hedge, the change in fair value for the effective portion of the hedge is reported as a component of “Other comprehensive income (loss)” in the consolidated statements of comprehensive income and is reclassified into earnings in the same period in which the hedged transaction affects earnings, and within the same consolidated statements of income line as the hedged transaction. For these derivatives, ineffectiveness appears if the cumulative gain or loss on the derivative hedging instrument exceeds the cumulative change in the expected future cash flows on the hedged transaction. Effectiveness on transactions hedged through purchased options is measured on the full fair value of the option, including time value. Derivative financial instruments not designated as a hedge The Company conducts its business on a global basis in various major international currencies. As a result, the Company is exposed to adverse movements in foreign currency exchange rates. The Company enters into foreign currency forward contracts and currency options to reduce its exposure to changes in exchange rates and the associated risk arising from the denomination of certain assets and liabilities in foreign currencies at the Company's subsidiaries. Financial instruments not designated as a hedge are classified as current assets when they are expected to be realized within twelve months of the balance sheet date. Marked-to-market gains or losses arising from changes in the fair value of these instruments are reported in the consolidated statements of income within “Other income and expenses, net” in the period in which they arise, since the transactions for these instruments occur within the Company’s operating activities.
Recent accounting pronouncements	2.27– Recent accounting pronouncements (a) Accounting pronouncements adopted in 2020 Expected credit losses on financial assets The Company adopted on January 1, 2020 ASC 326 new guidance on measuring credit losses for financial instruments, by applying the transitional modified-retrospective approach, which requires that any cumulative-effect adjustment is recorded in retained earnings as at transition date. losses estimates. The new guidance defines a current expected credit losses (“CECL”) model for financial assets measured at amortized cost, including held-to-maturity (“HTM”) debt securities; net investments in leases; and other off-balance sheet credit exposures not accounted for as insurance. It also defines an impairment model for AFS debt securities and the initial recognition of purchased credit-deteriorated (“PCD”) financial assets. Finally, the new guidance sets forth the impairment guidance for beneficial interests in securitized financial assets. The Company did not report upon adoption and as at December 31, 2020 any PCD financial assets, beneficial interests in securitized financial assets, HTM debt securities, net investments in leases, reinsurance receivables, receivables that relate to repurchase agreements and securities lending transactions or any off-balance sheet credit exposures. The main categories of financial assets measured at amortized cost within the scope of the new CECL model, as reported by the Company at adoption and reporting dates, were cash equivalents, short-term deposits, trade accounts receivable and other receivables. Concerning instruments for which the new AFS debt security impairment model applies, the Company reported U.S. Treasury Bonds held as marketable securities and classified as AFS debt securities. The Company applied the zero-nonpayment risk practical expedient permitted by the new guidance when measuring CECL on state receivables. The same zero-credit loss assumption is applied on U.S. Treasury Bonds in case of future decline in fair value. Allowances recorded, in compliance with prior practice, on financial assets measured at amortized cost, including the allowance for trade accounts receivable, Implementation costs incurred in a cloud computing arrangement (“CCA”) The Company adopted on January 1, 2020, the new guidance which clarifies the accounting for costs of implementation activities performed in a CCA that is a service contract. The amended guidance aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The Company elected to apply the new guidance prospectively to all implementation costs incurred in CCA existing on or after January 1, 2020. The new guidance did not have a material impact on the Company’s consolidated financial statements since the major part of existing and new CCA that are service contracts did not generate significant implementation costs. The new guidance is similar to past practice when applied to the most significant implementation activities incurred in existing CCA. Accounting for goodwill impairment The Company adopted on January 1, 2020, the new guidance which simplifies the accounting for goodwill impairment. The new guidance removes step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. Under the new guidance, a goodwill impairment is the amount by which a reporting unit’s carrying value exceeds its fair value. The Company applied the amended guidance during the third quarter of 2020 when it performed its annual impairment campaign. The new guidance did not have any impact on the outcome of the annual impairment test. Accounting pronouncements expected to impact the Company’s operations that are not yet effective and have not been early adopted by the Company In March 2020, the FASB provided optional guidance for a limited period to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The reference rate reform is expected to result in the discontinuance of LIBOR and certain other interest rate indexes at the end of 2021. The transition away from those rates may impact the valuation and measurement of debt instruments, derivatives and other contracts with payments based on those rates, as existing contracts will be modified. These contractual modifications may have accounting implications on the measurement of contracts referring to those rates and on existing hedging transactions on which hedge accounting is applied. The guidance provides relief through optional exemptions on the transition to new reference rates. One optional exemption is to account for a modified contract as a continuation of an existing contract without performing a detailed analysis. Other exemptions are permitted on hedge accounting in order to avoid discontinuance of existing hedge accounting transactions due to modification of critical terms in the hedge relationship. The guidance is effective as of March 12, 2020 through December 31, 2022. The Company will apply the first optional exemption described above on outstanding debt and other contracts for which the change in reference rates will imply a modification of existing contractual terms. The Company does not expect to be further impacted by the r eference r ate r eform as it does not report any hedging relationship (e.g. hedge of debt instruments) that are directly affected by the interest rate benchmark reform. In August 2020, the FASB issued new guidance on distinguishing liabilities from equity and EPS, to simplify an issuer’s accounting for convertible instruments by eliminating the cash conversion and beneficial conversion feature models in ASC 470-20 that require separate accounting for embedded conversion features. The guidance also simplifies the settlement assessment that issuers perform to determine whether a contract in their own equity qualifies for equity classification. Finally, the guidance requires entities to use in the calculation of the diluted EPS the if-converted method for all convertible instruments and to include the effect of share settlement for instruments that may be settled in cash or shares. The new guidance is effective for public companies for annual periods beginning after December 15, 2021, with early adoption permitted in fiscal years beginning after December 15, 2020. The guidance can be adopted either on a full retrospective basis or by applying the modified retrospective approach, with the impact upon transition recorded in retained earnings for existing instruments outstanding as at the adoption date. The Company is currently assessing the impact the new guidance will have on its consolidated financial statements, as Tranche B senior unsecured convertible bonds issued on July 3, 2017 and the dual-tranche senior unsecured convertible bonds issued on August 4, 2020 are convertible instruments with cash conversion features in the scope of the new guidance. The Company does not intend to early adopt the new guidance and intends to apply the modified retrospective method on instruments outstanding on January 1, 2022.

Accounting Policies (Tables)

Accounting Policies (Tables)	12 Months Ended
Accounting Policies (Tables)	Dec. 31, 2020
Accounting Policies [Abstract]
Schedule of Property, Plant and Equipment Useful Lives	Land is not depreciated. Depreciation on fixed assets is computed using the straight-line method over their estimated useful lives, as follows: Buildings 33 years Facilities and leasehold improvements 5-10 years Machinery and equipment 2-10 years Computer and R&D equipment 3-6 years Other 2-5 years

Short-Term Deposits and Marke_2

Short-Term Deposits and Marketable Securities (Tables)	12 Months Ended
Short-Term Deposits and Marketable Securities (Tables)	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets	To optimize the return yield on its short-term investments, the Company invested $581 million of available cash in short-term deposits as at December 31, 2020. These short-term deposits represent cash equivalents with original maturity beyond three months and no significant risk of changes in fair value. Changes in the fair value of marketable securities, as reported in current assets on the consolidated balance sheets as at December 31, 2020 and December 31, 2019 are detailed in the tables below: December 31, 2019 Purchase Proceeds at maturity Change in fair value included in OCI* Change in fair value recognized in earnings December 31, 2020 U.S. Treasury debt securities 133 — — — — 133 Total 133 — — — — 133 * Other Comprehensive Income December 31, 2018 Purchase Proceeds at maturity Change in fair value included in OCI* Change in fair value recognized in earnings December 31, 2019 U.S. Treasury debt securities 330 — (200 ) 3 — 133 Total 330 — (200 ) 3 — 133 * Other Comprehensive Income

Trade Accounts Receivable, Net

Trade Accounts Receivable, Net (Tables)	12 Months Ended
Trade Accounts Receivable, Net (Tables)	Dec. 31, 2020
Receivables [Abstract]
Trade Accounts Receivable, Net	Trade accounts receivable, net consisted of the following: December 31, December 31, 2020 2019 Trade accounts receivable 1,481 1,396 Current expected credit losses allowance ("CECLA")* (16 ) (16 ) Total 1,465 1,380
Schedule of Changes in Reported CECLA	On that basis, the changes in reported CECLA for the year ended December 31, 2020 are presented below: Allowance for doubtful accounts as at December 31, 2019 (under prior ASC 326) (16) Amount recognized through opening retained earnings upon new ASC 326 — CECLA as at January 1, 2020 (under new ASC 326) (16) Current-period adjustment to CECLA — CECLA as at December 31, 2020 (16)

Inventories (Tables)

Inventories (Tables)	12 Months Ended
Inventories (Tables)	Dec. 31, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories consisted of the following: December 31, December 31, 2020 2019 Raw materials 175 137 Work-in-process 1,120 1,104 Finished products 546 450 Total 1,841 1,691

Other Current Assets (Tables)

Other Current Assets (Tables)	12 Months Ended
Other Current Assets (Tables)	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Other Current Assets	Other current assets consisted of the following: December 31, 2020 December 31, 2019 Receivables from government agencies 244 216 Taxes and other government receivables 114 71 Advances 39 47 Prepayments 70 56 Loans and deposits 8 8 Interest receivable 3 9 Derivative instruments 65 8 Other current assets 41 27 Total 584 442

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
Business Combinations (Tables)	Dec. 31, 2020
Schedule of Preliminary Fair Value of Identifiable Assets and Assumed Liabilities	The preliminary fair value at acquisition date of the identifiable assets acquired and liabilities assumed were as follows: Fair value recognized at acquisition date Property, plant and equipment 1 Technologies & licenses 108 Technologies in progress 10 Other intangible assets 2 Deferred tax assets 5 Deferred tax liabilities (18) Net working capital (4) Goodwill (1) 135 Total net assets at fair value 239 Purchase consideration 239 (1) The items that generated goodwill are workforce, synergies, future products and access to new markets. The goodwill is allocated to the ADG and MDG reportable segments as described in Note 8. An amount of $45 million of goodwill was estimated to be tax deductible.
Norstel AB [Member]
Schedule of Preliminary Fair Value of Identifiable Assets and Assumed Liabilities	The final fair value of the assets acquired and liabilities assumed from Norstel were as follows: Fair value recognized at acquisition date Measurement period adjustments Fair value recognized as a result of acquisition Property, plant and equipment 11 — 11 Technology in progress 86 — 86 Deferred tax assets — 4 4 Deferred tax liabilities — (18) (18) Net working capital (2) — (2) Goodwill (1) 43 14 57 Total net assets at fair value 138 — 138 Purchase consideration 138 — 138 (1) The primary item that generated goodwill is the value of the future synergies between Norstel technology in silicon carbide and the Company, which do not qualify as a separately identified intangible asset. The goodwill is allocated to the ADG reportable segment as described in Note 8.

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
Goodwill (Tables)	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	Goodwill allocated to reportable segments as at December 31, 2020 and 2019 and changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 are as follows: Automotive and Discrete Group (ADG) Microcontrollers and Digital ICs Group (MDG) Analog, MEMS & Sensors Group (AMS) Total December 31, 2018 — 119 2 121 Business combination 43 — — 43 Foreign currency translation — (2 ) — (2 ) December 31, 2019 43 117 2 162 Business combination 38 111 — 149 Foreign currency translation 10 9 — 19 December 31, 2020 91 237 2 330

Other Intangible Assets, Net (T

Other Intangible Assets, Net (Tables)	12 Months Ended
Other Intangible Assets, Net (Tables)	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Other Intangible Assets, Net	Other intangible assets, net consisted of the following: December 31, 2020 Gross Cost Accumulated Amortization Net Cost Technologies & licenses 934 (623 ) 311 Purchased & internally developed software 537 (461 ) 76 Technologies in progress 56 — 56 Other intangible assets 72 (70 ) 2 Total 1,599 (1,154 ) 445 December 31, 2019 Gross Cost Accumulated Amortization Net Cost Technologies & licenses 699 (578 ) 121 Purchased & internally developed software 486 (427 ) 59 Technologies in progress 119 — 119 Other intangible assets 70 (70 ) — Total 1,374 (1,075 ) 299
Estimated Amortization Expense of Existing Intangible Assets	The estimated amortization expense of the existing intangible assets for the following years is: Year 2021 97 2022 82 2023 64 2024 49 2025 35 Thereafter 118 Total 445

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
Property, Plant and Equipment, Net (Tables)	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Property, Plant and Equipment, Net	Property, plant and equipment, net consisted of the following: December 31, 2020 Gross Cost Accumulated Depreciation Net Cost Land 86 — 86 Buildings 995 (567 ) 428 Facilities & leasehold improvements 3,545 (3,038 ) 507 Machinery and equipment 16,689 (13,859 ) 2,830 Computer and R&D equipment 402 (347 ) 55 Operating lease right-of-use assets 290 (99 ) 191 Other tangible assets 118 (99 ) 19 Construction in progress 480 — 480 Total 22,605 (18,009 ) 4,596 December 31, 2019 Gross Cost Accumulated Depreciation Net Cost Land 78 — 78 Buildings 905 (505 ) 400 Facilities & leasehold improvements 3,193 (2,762 ) 431 Machinery and equipment 15,336 (12,790 ) 2,546 Computer and R&D equipment 382 (335 ) 47 Operating lease right-of-use assets 266 (60 ) 206 Other tangible assets 110 (93 ) 17 Construction in progress 282 — 282 Total 20,552 (16,545 ) 4,007

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2020
Lessee Disclosure [Abstract]
Schedule of Operating Lease	Operating leases consisted of the following: December 31, 2020 December 31, 2019 Assets Right-of-use assets 191 206 Total right-of-use assets 191 206 Lease liabilities Current 54 55 Non-current 142 152 Total lease liabilities 196 207
Schedule of Maturities of Operating Lease Liabilities	Maturities of operating lease liabilities are as follows: December 31, 2020 2021 58 2022 44 2023 32 2024 21 2025 13 Thereafter 76 Total future undiscounted cash outflows 244 Effect of discounting (48 ) Total operating lease liabilities 196
Schedule of Operating Lease Term and Discount Rate	Operating lease term and discount rate are as follows: December 31, 2020 December 31, 2019 Weighted average remaining lease term (in years) 9.01 9.26 Weighted average discount rate 2.71 % 2.79 %
Schedule of Operating Lease Cost and Cash Paid	Operating lease cost and cash paid are as follows: 2020 2019 Operating lease cost 65 65 Operating lease cash paid 65 65
Schedule of Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities	Right-of-use assets obtained in exchange for new operating lease liabilities are as follows: 2020 2019 Operating leases 40 38

Long-Term Investments (Tables)

Long-Term Investments (Tables)	12 Months Ended
Long-Term Investments (Tables)	Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]
Long-Term Investments	December 31, 2020 December 31, 2019 Long-term investments 10 11 Total 10 11

Other Non-Current Assets (Table

Other Non-Current Assets (Tables)	12 Months Ended
Other Non-Current Assets (Tables)	Dec. 31, 2020
Investments All Other Investments [Abstract]
Other Non-Current Assets	Other non-current assets consisted of the following: December 31, December 31, 2020 2019 Equity securities 25 23 Long-term State receivables 623 358 Deposits and other non-current assets 76 56 Total 724 437

Other Payables and Accrued Li_2

Other Payables and Accrued Liabilities (Tables)	12 Months Ended
Other Payables and Accrued Liabilities (Tables)	Dec. 31, 2020
Payables And Accruals [Abstract]
Other Payables and Accrued Liabilities	Other payables and accrued liabilities consisted of the following: December 31, 2020 December 31, 2019 Employee related liabilities 467 375 Employee compensated absences 164 138 Taxes other than income taxes 58 53 Advances 75 63 Derivative instruments 2 7 Provision for restructuring 4 10 Defined benefit plans – current portion 9 10 Defined contribution plans – accrued benefits 23 20 Other long-term employee benefits – current portion 4 7 Royalties 24 21 Current lease liabilities 54 55 Deferred consideration for business combinations — 10 Others 82 62 Total 966 831

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
Long-Term Debt (Tables)	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-term debt consisted of the following: December 31, December 31, 2020 2019 Funding program loans from European Investment Bank: 1.36% due 2020, floating interest rate at Libor + 1.099% — 13 1.20% due 2020, floating interest rate at Libor + 0.956% — 28 0.37% due 2020, floating interest rate at Euribor + 0.817% — 14 0.77% due 2021, floating interest rate at Libor + 0.525% 30 60 0.83% due 2021, floating interest rate at Libor + 0.572% 29 58 0.09% due 2028, floating interest rate at Euribor + 0.589% 250 258 0.22% due 2029, floating interest rate at Euribor + 0.564% 270 275 Dual tranche senior unsecured convertible bonds Zero-coupon, due 2022 (Tranche A) — 700 0.25% due 2024 (Tranche B) 674 654 Zero-coupon, due 2025 (Tranche A) 703 — Zero-coupon, due 2027 (Tranche B) 661 — Other funding program loans: 0.48% (weighted average), due 2021-2028, fixed interest rate 4 12 Total long-term debt 2,621 2,072 Less current portion (795 ) (173 ) Total long-term debt, less current portion 1,826 1,899
Long-Term Debt Denominated by Currencies	Long-term debt is denominated in the following currencies: December 31, 2020 December 31, 2019 U.S. dollar 2,097 1,513 Euro 524 559 Total 2,621 2,072
Total Long-Term Debt Outstanding Maturities	Aggregate future maturities of total long-term debt (including current portion) at principal amount are as follows: December 31, 2020 2021 121 2022 62 2023 62 2024 812 2025 812 Thereafter 965 Total 2,834

Post-Employment and Other Lon_2

Post-Employment and Other Long-Term Employees Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Changes in Benefit Obligation and Plan Assets	The changes in benefit obligation and plan assets were as follows: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Change in benefit obligation: Benefit obligation at beginning of year 1,036 911 88 81 Service cost 31 27 11 5 Interest cost 21 24 1 1 Employee contributions 4 3 — — Plan amendments 1 1 — — Benefits paid (13 ) (15 ) (11 ) (4 ) Effect of curtailment — — — — Effect of settlement (2 ) (36 ) — — Actuarial (gain) loss 83 117 3 6 Foreign currency translation adjustment 55 4 9 (1 ) Benefit obligation at end of year 1,216 1,036 101 88 Change in plan assets: Plan assets at fair value at beginning of year 597 527 — — Actual return on plan assets 84 81 — — Employer contributions 17 21 — — Employee contributions 4 3 — — Benefits paid (3 ) (5 ) — — Effect of settlement — (36 ) — — Foreign currency translation adjustments 19 6 — — Plan assets at fair value at end of year 718 597 — — Funded status (498 ) (439 ) (101 ) (88 ) Net amount recognized in the consolidated balance sheets consisted of the following: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Non-current assets 4 4 — — Current liabilities (9 ) (10 ) (4 ) (7 ) Long-term liabilities (493 ) (433 ) (97 ) (81 ) Net amount recognized (498 ) (439 ) (101 ) (88 )
Accumulated Other Comprehensive Income (Loss) Before Tax Effects	The components of accumulated other comprehensive loss (income) before tax effects were as follows: Actuarial (gains)/losses Prior service cost Total Accumulated other comprehensive loss as at December 31, 2018 152 3 155 Net amount generated/arising in current year 57 1 58 Amortization (13 ) (1 ) (14 ) Foreign currency translation adjustment 1 — 1 Accumulated other comprehensive loss as at December 31, 2019 197 3 200 Net amount generated/arising in current year 21 1 22 Amortization (13 ) (1 ) (14 ) Foreign currency translation adjustment 11 — 11 Accumulated other comprehensive loss as at December 31, 2020 216 3 219
Schedule of Accumulated Benefit Obligations	The accumulated benefit obligations were as follows: Pension Benefits Other Long-Term Benefits December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Accumulated benefit obligations 1,053 896 83 74
Components of Net Periodic Benefit Cost	The components of the net periodic benefit cost included the following: Pension Benefits Other Long-term Benefits Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Service cost 31 27 27 11 5 6 Interest cost 21 24 24 1 1 1 Expected return on plan assets (23 ) (22 ) (23 ) — — — Amortization of actuarial net loss (gain) 12 10 8 3 7 1 Amortization of prior service cost 1 1 1 — — — Effect of settlement 1 3 — — — — Effect of curtailment — — 1 — — — Net periodic benefit cost 43 43 38 15 13 8
Weighted Average Assumptions Used in Determination of Benefit Obligation and Plan Assets	The weighted average assumptions used in the determination of the benefit obligation and the plan assets for the pension plans and the other long-term benefits were as follows: Assumptions 2020 2019 Discount rate 1.45 % 1.95 % Salary increase rate 2.43 % 2.48 % Expected long-term rate of return on funds for the pension expense of the following year 3.44 % 4.04 % The weighted average assumptions used in the determination of the net periodic benefit cost for the pension plans and the other long-term benefits were as follows: Assumptions 2020 2019 2018 Discount rate 1.95 % 2.75 % 2.54 % Salary increase rate 2.48 % 2.32 % 2.37 % Expected long-term rate of return on funds for the pension expense of the year 4.04 % 4.16 % 4.23 %
Pension Plan Asset Allocation	The Company’s pension plan asset allocation at December 31, 2020 and at December 31, 2019 is as follows: Percentage of Plan Assets at December Asset Category 2020 2019 Cash and cash equivalents 1 % 1 % Equity securities 23 % 24 % Government debt securities 12 % 12 % Corporate debt securities 15 % 16 % Investments in funds (a) 21 % 21 % Real estate 2 % 2 % Other (mainly insurance assets – contracts and reserves) 26 % 24 % Total 100 % 100 % (a) As at December 31, 2020, investments in funds were composed of commingled and multi-strategy funds invested in diversified portfolios of fixed income ( 72 %) - mainly corporate bonds, equity ( 13 ), other instruments (15 % ). As at December 31, 2019, investments in funds were composed of commingled and multi-strategy funds invested in diversified portfolios of corporate bonds (37%), government bonds (32%), equity (15%) and other instruments (16%).
Pension Plan Asset Allocation Including Fair-Value Measurements	The Company’s detailed pension plan asset allocation including the fair-value measurements of those plan assets as at December 31, 2020 is as follows: Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents 4 4 — — Equity securities 167 2 165 — Government debt securities 86 — 86 — Corporate debt securities 105 — 81 24 Investment funds 153 3 150 — Real estate 11 — 11 — Other (mainly insurance assets – contracts and reserves) 192 — 54 138 TOTAL 718 9 547 162 The Company’s detailed pension plan asset allocation including the fair-value measurements of those plan assets as at December 31, 2019 is as follows: Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Cash and cash equivalents 5 5 — — Equity securities 144 1 143 — Government debt securities 74 — 74 — Corporate debt securities 95 — 83 12 Investment funds 127 1 126 — Real estate 10 — 10 — Other (mainly insurance assets – contracts and reserves) 142 — 41 101 TOTAL 597 7 477 113
Reconciliation for Plan Assets Measured at Fair Value Using Unobservable Inputs (Level 3)	For plan assets measured at fair value using significant unobservable inputs (Level 3), the reconciliation between January 1, 2020 and December 31, 2020 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2020 113 Contributions (employer and employee) 14 Actual return on plan assets 2 Net benefit payments (a) 11 Settlements — Transfer in Level 3 10 Foreign currency translation adjustment 12 December 31, 2020 162 ( a ) For plan assets measured at fair value using significant unobservable inputs (Level 3), the reconciliation between January 1, 2019 and December 31, 2019 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2019 117 Contributions (employer and employee) 11 Actual return on plan assets (1 ) Net benefit payments (a) 9 Settlements (34 ) Transfer in Level 3 11 December 31, 2019 113 ( a )
Estimated Future Benefit Payments	The Company’s estimated future benefit payments as at December 31, 2020 are as follows: Years Pension Benefits Other Long-term Benefits 2021 38 5 2022 30 5 2023 40 6 2024 51 9 2025 56 9 From 2026 to 2030 298 49

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	12 Months Ended
Other Long-Term Liabilities (Tables)	Dec. 31, 2020
Text Block [Abstract]
Summary of Other Long-Term Liabilities	Other long-term liabilities consisted of the following: December 31, 2020 December 31, 2019 Non-current lease liabilities 142 152 Contingent consideration on business combinations 123 — Deferred consideration 20 — Other long-term employee benefits 97 81 Long-term liability related to public funding 42 47 Provision for restructuring — 1 Others 64 49 Total 488 330

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
Shareholders' Equity (Tables)	Dec. 31, 2020
Classification of Pre-Payroll Tax and Social Contribution Stock-Based Compensation Expense Included in Consolidated Statements of Income	The following table illustrates the classification of pre-payroll tax and social contribution stock-based compensation expense included in the consolidated statements of income for the years ended December 31, 2020, December 31, 2019 and December 31, 2018: December 31, 2020 December 31, 2019 December 31, 2018 Cost of sales 25 22 23 Selling, general and administrative 51 46 67 Research and development 79 77 35 Total pre-payroll tax and social contribution compensation 155 145 125
Changes in AOCI Attributable to Stockholders	The table below details the changes in AOCI attributable to the company’s stockholders by component, net of tax, for the years ended December 31, 2020, 2019 and 2018: Gains (Losses) on Cash Flow Hedges Gains (Losses) on Available- For-Sale Securities Defined Benefit Pension Plan Items Foreign Currency Translation Adjustments (“CTA”) Total December 31, 2017 45 — (166 ) 768 647 Cumulative tax impact — — 41 — 41 December 31, 2017, net of tax 45 — (125 ) 768 688 OCI before reclassifications (83 ) (2 ) (24 ) (87 ) (196 ) Amounts reclassified from AOCI (1 ) — 11 — 10 OCI for the year ended December 31, 2018 (84 ) (2 ) (13 ) (87 ) (186 ) Cumulative tax impact 4 — 3 — 7 OCI for the year ended December 31, 2018, net of tax (80 ) (2 ) (10 ) (87 ) (179 ) December 31, 2018 (39 ) (2 ) (179 ) 681 461 Cumulative tax impact 4 — 44 — 48 December 31, 2018, net of tax (35 ) (2 ) (135 ) 681 509 OCI before reclassifications (43 ) 3 (58 ) (35 ) (133 ) Amounts reclassified from AOCI 79 — 14 — 93 OCI for the year ended December 31, 2019 36 3 (44 ) (35 ) (40 ) Cumulative tax impact (4 ) — 10 — 6 OCI for the year ended December 31, 2019, net of tax 32 3 (34 ) (35 ) (34 ) December 31, 2019 (3 ) 1 (223 ) 646 421 Cumulative tax impact — — 54 — 54 December 31, 2019, net of tax (3 ) 1 (169 ) 646 475 OCI before reclassifications 64 — (22 ) 203 245 Amounts reclassified from AOCI — — 14 — 14 OCI for the year ended December 31, 2020 64 — (8 ) 203 259 Cumulative tax impact (8 ) — (3 ) — (11 ) OCI for the year ended December 31, 2020, net of tax 56 — (11 ) 203 248 December 31, 2020 61 1 (231 ) 849 680 Cumulative tax impact (8 ) — 51 — 43 December 31, 2020, net of tax 53 1 (180 ) 849 723
Schedule of Items Reclassified Out of Accumulated Other Comprehensive Income	Items reclassified out of Accumulated Other Comprehensive Income for the years ended December 31, 2020, 2019 and 2018 are listed in the table below: Details about AOCI components Amounts reclassified from AOCI in the year ended December 31, 2020 Amounts reclassified from AOCI in the year ended December 31, 2019 Amounts reclassified from AOCI in the year ended December 31, 2018 Affected line item in the statement where net income (loss) is presented Gains (Losses) on Cash Flow Hedges Foreign exchange derivative contracts (3 ) (51 ) 4 Cost of sales Foreign exchange derivative contracts 1 (6 ) (1 ) Selling, general and administrative Foreign exchange derivative contracts 2 (22 ) (2 ) Research and development — 10 — Income tax benefit (expense) — (69 ) 1 Net of tax Defined Benefit Pension Plan Items Amortization of actuarial gains (losses) (13 ) (13 ) (10 ) Other components of pension benefit costs Amortization of prior service cost (1 ) (1 ) (1 ) Other components of pension benefit costs 3 3 2 Income tax benefit (expense) (11 ) (11 ) (9 ) Net of tax Total reclassifications for the year (11 ) (80 ) (8 ) Attributable to noncontrolling interest — — — Attributable to the parent company stockholders (11 ) (80 ) (8 )
Supervisory Board [Member]
Summary of Grants Under Outstanding Stock Award Plans	The table below summarizes grants under the outstanding stock award plans, as authorized by the Compensation Committee: Year of grant Options granted and vested Options waived at grant 2010 172,500 (7,500 ) 2011 172,500 (30,000 ) 2012 180,000 (22,500 ) 2013 to 2020 No options granted
Summary of Nonvested Share Activity	A summary of the options’ activity by plan for the years ended December 31, 2020 and December 31, 2019 is presented below: Year of grant Outstanding as of December 31, 2018 Exercised Expired / Cancelled Outstanding as of December 31, 2019 Exercised Expired / Cancelled Outstanding as of December 31, 2020 2010 22,500 (22,500 ) — — — — — 2011 52,500 (7,500 ) — 45,000 (37,500 ) — 7,500 2012 65,000 — — 65,000 (15,000 ) — 50,000
Employees [Member]
Summary of Grants Under Outstanding Stock Award Plans	The table below summarizes grants under the outstanding stock award plans in 2020, as authorized by the Compensation Committee: Date of grant Plan name Number of shares granted Number of shares waived Number of shares lost on performance conditions July 25, 2017 2017 Employee Plan 7,634,475 — — December 22, 2017 2017 Employee Plan 347,160 — — July 24, 2018 2018 Employee Plan 7,552,410 — — December 20, 2018 2018 Employee Plan 443,200 — — May 23, 2019 2019 CEO Special Bonus 34,960 — — July 24, 2019 2019 Employee Plan 7,752,940 — (1,161,966 ) December 26, 2019 2019 Employee Plan 246,750 — (17,013 ) July 23, 2020 2020 Employee Plan 7,437,580 — () December 24, 2020 2020 Employee Plan 562,350 — () (*) As at December 31, 2020, a final determination of the achievement of the performance conditions had not yet been made by the Compensation Committee of the Supervisory Board.
Summary of Nonvested Share Activity	A summary of the unvested share activity by plan for the year ended December 31, 2020 is presented below: Unvested Shares Unvested as at December 31, 2019 Granted Forfeited / waived Cancelled on failed vesting conditions Vested Unvested as at December 31, 2020 2017 Employee Plan 2,648,379 — (14,634 ) — (2,633,745 ) — 2018 Employee Plan 5,197,924 — (36,912 ) — (2,442,327 ) 2,718,685 2019 CEO Special Bonus — 34,960 — — (11,654 ) 23,306 2019 Employee Plan 7,977,370 — (51,111 ) (1,178,979 ) (2,172,160 ) 4,575,120 2020 Employee Plan — 7,999,930 (28,385 ) — (600 ) 7,970,945 Total 15,823,673 8,034,890 (131,042 ) (1,178,979 ) (7,260,486 ) 15,288,056

Revenues (Tables)

Revenues (Tables)	12 Months Ended
Revenues (Tables)	Dec. 31, 2020
Revenue From Contract With Customer [Abstract]
Summary of Consolidated Net Revenues Disaggregated by Product Group, Geographical Region of Shipment and Nature	The following tables present the Company’s consolidated net revenues disaggregated by geographical region of shipment and nature. Year ended December 31, 2020 December 31, 2019 December 31, 2018 Net revenues by geographical region of shipment (1) EMEA 1,966 2,265 2,478 Americas 1,165 1,351 1,264 Asia Pacific 7,088 5,940 5,922 Total revenues 10,219 9,556 9,664 Net revenues by nature Revenues from sale of products 10,049 9,381 9,461 Revenues from sale of services 132 148 151 Other revenues 38 27 52 Total revenues 10,219 9,556 9,664 Net revenues by market channel (2) Original Equipment Manufacturers (“OEM”) 7,411 6,720 6,325 Distribution 2,808 2,836 3,339 Total revenues 10,219 9,556 9,664 (1) Net revenues by geographical region of shipment are classified by location of customer invoiced or reclassified by shipment destination in line with customer demand. For example, products ordered by U.S.-based companies to be invoiced to Asia Pacific affiliates are classified as Asia Pacific revenues. (2) Original Equipment Manufacturers (“OEM”) are the end-customers to which the Company provides direct marketing application engineering support, while Distribution customers refers to the distributors and representatives that the Company engages to distribute its products around the world.

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 31, 2020
Segment Reporting [Abstract]
Net Revenues by Product Segment and by Product Line	The following tables present the Company’s consolidated net revenues and consolidated operating income by reportable segment. Net revenues by reportable segment: December 31, 2020 December 31, 2019 December 31, 2018 Automotive and Discrete Group (ADG) 3,284 3,606 3,556 Analog, MEMS and Sensors Group (AMS) 3,892 3,299 3,154 Microcontrollers and Digital ICs Group (MDG) 3,030 2,638 2,940 Total net revenues of product segments 10,206 9,543 9,650 Others 13 13 14 Total consolidated net revenues 10,219 9,556 9,664
Operating Income by Reportable Segment	Operating income by reportable segment: December 31, 2020 December 31, 2019 December 31, 2018 Automotive and Discrete Group (ADG) 182 357 431 Analog, MEMS and Sensors Group (AMS) 810 596 488 Microcontrollers and Digital ICs Group (MDG) 504 354 547 Total operating income of product segments 1,496 1,307 1,466 Others (1) (173 ) (104 ) (66 ) Total consolidated operating income 1,323 1,203 1,400 (1) Operating income (loss) of “Others” includes items such as unused capacity charges, including reduced manufacturing activity due to COVID-19, impairment, restructuring charges and other related closure costs, management reorganization costs, phase out and start-up costs of certain manufacturing facilities, and other unallocated expenses such as: strategic or special research and development programs, certain corporate-level operating expenses, patent claims and litigations, and other costs that are not allocated to product groups, as well as operating earnings of other products .
Reconciliation of Operating Income of Segments to Total Operating Income	Reconciliation of operating income of segments to the total operating income: December 31, 2020 December 31, 2019 December 31, 2018 Total operating income of segments 1,496 1,307 1,466 Impairment, restructuring charges and other related closure costs (11 ) (5 ) (21 ) Unused capacity charges (153 ) (65 ) (1 ) Other unallocated manufacturing results (8 ) (25 ) 2 Gain on sale of non-current assets 11 6 1 Strategic and other research and development programs and other non-allocated provisions (1) (12 ) (15 ) (47 ) Total operating loss Others (173 ) (104 ) (66 ) Total consolidated operating income 1,323 1,203 1,400 (1) Includes unallocated income and expenses such as certain corporate-level operating expenses and other income (costs) that are not allocated to the product segments.
Net Revenues	Net revenues December 31, 2020 December 31, 2019 December 31, 2018 Netherlands 2,795 2,842 2,917 France 89 108 127 Italy 52 59 64 USA 976 1,157 1,132 Singapore 5,817 4,857 4,873 Japan 479 520 534 Other countries 11 13 17 Total 10,219 9,556 9,664
Property, Plant & Equipment	Property, plant and equipment December 31, 2020 December 31, 2019 Netherlands 1,046 897 France 905 726 Italy 1,213 900 Other European countries 118 117 USA 24 25 Singapore 604 670 Malaysia 186 218 Other countries 500 454 Total 4,596 4,007

Other Income and Expenses, Net

Other Income and Expenses, Net (Tables)	12 Months Ended
Other Income and Expenses, Net (Tables)	Dec. 31, 2020
Other Income And Expenses [Abstract]
Other Income and Expenses, Net	Other income and expenses, net consisted of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Research and development funding 231 132 52 Phase-out and start-up costs (8 ) (38 ) (1 ) Exchange gains and losses, net 8 — 4 Patent costs (11 ) (1 ) (8 ) Gain on sale of non-current assets 14 7 8 COVID-19 incremental costs (32 ) — — Other, net — 3 (2 ) Total 202 103 53

Impairment, Restructuring Cha_2

Impairment, Restructuring Charges and Other Related Closure Costs (Tables)	12 Months Ended
	Dec. 31, 2020
Restructuring And Related Activities [Abstract]
Summary of Impairment, Restructuring Charges and Other Related Closure Costs	Impairment, restructuring charges and other related closure costs incurred in 2020, 2019 and 2018 are summarized as follows: Year ended December 31, 2020 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — 1 — 1 Bouskoura restructuring plan — (8 ) — (8 ) Long-lived asset impairment charge (4 ) — — (4 ) Total (4 ) (7 ) — (11 ) Year ended December 31, 2019 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — 2 — 2 Long-lived asset impairment charge (7 ) — — (7 ) Total (7 ) 2 — (5 ) Year ended December 31, 2018 Impairment Restructuring charges Other related closure costs Total impairment, restructuring charges and other related closure costs Set-top Box restructuring plan — (19 ) — (19 ) Long-lived asset impairment charge (2 ) — — (2 ) Total (2 ) (19 ) — (21 )
Changes to Restructuring Provisions Recorded on Consolidated Balance Sheets	Changes to the restructuring provisions recorded on the consolidated balance sheets from December 31, 2018 to December 31, 2020 are summarized as follows: Set-top Box restructuring plan Bouskoura restructuring plan Other restructuring initiatives Total Provision as at December 31, 2018 34 — 1 35 Adjustment for unused provisions (2 ) — — (2 ) Amounts paid (20 ) — (1 ) (21 ) Currency translation effect (1 ) — — (1 ) Provision as at December 31, 2019 11 — — 11 Charges incurred in 2020 — 8 — 8 Adjustment for unused provisions (1 ) — — (1 ) Amounts paid (6 ) (8 ) — (14 ) Provision as at December 31, 2020 4 — — 4

Interest Income (Expense), Net

Interest Income (Expense), Net (Tables)	12 Months Ended
Interest Income (Expense), Net (Tables)	Dec. 31, 2020
Banking And Thrift Interest [Abstract]
Summary of Interest Income (Expense), Net	Interest income (expense), net consisted of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income 34 55 47 Expense (54 ) (54 ) (54 ) Total (20 ) 1 (7 )

Income Tax (Tables)

Income Tax (Tables)	12 Months Ended
Income Tax (Tables)	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income (Loss) before Income Tax	Income (loss) before income tax is comprised of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income (loss) recorded in the Netherlands (19 ) (9 ) (13 ) Income (loss) from foreign operations 1,286 1,198 1,402 Income (loss) before income tax benefit (expense) 1,267 1,189 1,389
Income Tax Benefit (Expense)	Income tax benefit (expense) is comprised of the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 The Netherlands taxes - current — — — Foreign taxes - current (171 ) (131 ) (114 ) Total current taxes (171 ) (131 ) (114 ) The Netherlands taxes - deferred — — — Foreign taxes - deferred 12 (25 ) 18 Total deferred taxes 12 (25 ) 18 Income tax expense (159 ) (156 ) (96 ) Effective tax rate 13 % 13 % 7 %
Differences in Income Taxes Computed at Netherlands Statutory Rate and Effective Income Tax Rate	The principal items comprising the differences in income taxes computed at the Netherlands statutory rate of 25.0% in 2020, 2019 and 2018, and the effective income tax rate are the following: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Income tax benefit (expense) computed at statutory rate (316 ) (297 ) (353 ) Non-deductible and non-taxable permanent differences, net (1 ) 4 45 Valuation allowance adjustments 11 2 141 Effect on deferred taxes of changes in enacted tax rates (5 ) 14 (62 ) Current year credits 40 50 43 Other tax and credits (40 ) (51 ) (20 ) Benefits from tax holidays 37 129 135 Net impact of changes to uncertain tax positions (1 ) (5 ) (16 ) Earnings of subsidiaries taxed at different rates 116 (2 ) (9 ) Income tax benefit (expense) (159 ) (156 ) (96 )
Deferred Tax Assets and Liabilities	Deferred tax assets and liabilities consisted of the following: December 31, 2020 December 31, 2019 Tax loss carryforwards and investment credits 702 612 Less unrecognized tax benefit (19 ) (21 ) Tax loss carryforwards net of unrecognized tax benefit 683 591 Inventory valuation 34 28 Impairment and restructuring charges 3 6 Fixed asset depreciation in arrears 82 39 Increased depreciation incentives 182 213 Capitalized development costs 107 118 Receivables for government funding 40 14 Tax credits granted on past capital investments 215 1,151 Pension service costs 104 81 Stock awards 11 6 Operating lease liabilities 36 40 Commercial accruals 13 15 Other temporary differences 26 22 Total deferred tax assets 1,536 2,324 Valuation allowances (638 ) (1,534 ) Deferred tax assets, net 898 790 Accelerated fixed asset depreciation (21 ) (20 ) Acquired intangible assets (40 ) (16 ) Advances of government funding (94 ) (31 ) Operating lease right-of-use assets (36 ) (40 ) Other temporary differences (43 ) (7 ) Deferred tax liabilities (234 ) (114 ) Net deferred income tax asset 664 676
Gross Deferred Tax Assets On Tax Loss Carryforwards And Investment Credits Expiration Table Text Block	As at December 31, 2020, the Company and its subsidiaries have gross deferred tax assets on tax loss carryforwards and investment credits that expire starting 2021, as follows : Year 2021 4 2022 7 2023 5 2024 4 2025 13 Thereafter 669 Total 702
Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits	A reconciliation of 2020, 2019 and 2018 beginning and ending amounts of unrecognized tax benefits is as follows: December 31, 2020 December 31, 2019 December 31, 2018 Balance at beginning of year 48 38 333 Additions based on tax positions related to the current year 1 7 43 Additions based on acquisitions related to the current year — 5 — Additions for tax positions of prior years 1 1 8 Reduction for tax positions of prior years (2 ) (1 ) (310 ) Settlements (1 ) (2 ) (18 ) Foreign currency translation 1 — (18 ) Balance at end of year 48 48 38

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
Earnings per Share (Tables)	Dec. 31, 2020
Earnings Per Share [Abstract]
Summary of Earnings per Share ("EPS")	For the years ended December 31, 2020, 2019 and 2018, earnings per share (“EPS”) was calculated as follows: Year ended December 31, 2020 Year ended December 31, 2019 Year ended December 31, 2018 Basic EPS Net income attributable to parent company 1,106 1,032 1,287 Weighted average shares outstanding 894,578,477 894,297,697 899,363,170 Basic EPS 1.24 1.15 1.43 Diluted EPS Net income attributable to parent company 1,106 1,032 1,287 Weighted average shares outstanding 894,578,477 894,297,697 899,363,170 Dilutive effect of stock awards 8,860,216 7,014,595 7,251,641 Dilutive effect of convertible debt 16,291,279 2,333,493 4,341,334 Number of shares used in calculating diluted EPS 919,729,972 903,645,785 910,956,145 Diluted EPS 1.20 1.14 1.41

Commitments (Tables)

Commitments (Tables)	12 Months Ended
Commitments (Tables)	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Company's Commitments	The Company’s commitments as at December 31, 2020 were as follows: In millions of U.S. dollars Total 2021 2022 2023 2024 2025 Thereafter Purchase obligations 1,978 1,488 237 124 68 61 — of which: Equipment purchase 916 916 — — — — — Foundry purchase 935 475 216 119 64 61 — Software, design, technologies and licenses 127 97 21 5 4 — — Other obligations 869 452 120 62 83 62 90 Total 2,847 1,940 357 186 151 123 90

Financial Instruments and Ris_2

Financial Instruments and Risk Management (Tables)	12 Months Ended
Financial Instruments and Risk Management (Tables)	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Notional Amounts of Outstanding Derivative Instruments	As at December 31, 2020, the Company had the following outstanding derivative instruments that were entered into to hedge Euro-denominated and Singapore dollar-denominated forecasted transactions: In millions of Euros Notional amount for hedge on forecasted R&D and other operating expenses Notional amount for hedge on forecasted manufacturing costs Forward contracts 215 341 Currency collars 237 334 In millions of Singapore dollars Notional amount for hedge on forecasted R&D and other operating expenses Notional amount for hedge on forecasted manufacturing costs Forward contracts — 157
Fair Value of Derivative Instruments	Information on fair value of derivative instruments and their location in the consolidated balance sheets as at December 31, 2020 and December 31, 2019 is presented in the table below: As at December 31, 2020 As at December 31, 2019 Asset Derivatives Balance sheet location Fair value Balance sheet location Fair value Derivatives designated as a hedge: Foreign exchange forward contracts Other current assets 40 Other current assets 4 Currency collars Other current assets 15 Other current assets 1 Total derivatives designated as a hedge 55 5 Derivatives not designated as a hedge: Foreign exchange forward contracts Other current assets 10 Other current assets 3 Total derivatives not designated as a hedge: 10 3 Total Derivatives 65 8 As at December 31, 2020 As at December 31, 2019 Liability Derivatives Balance sheet location Fair value Balance sheet location Fair value Derivatives designated as a hedge: Foreign exchange forward contracts Other payables and accrued liabilities — Other payables and accrued liabilities (4 ) Currency collars Other payables and accrued liabilities — Other payables and accrued liabilities (2 ) Total derivatives designated as a hedge — (6 ) Derivatives not designated as a hedge: Foreign exchange forward contracts Other payables and accrued liabilities (2 ) Other payables and accrued liabilities (1 ) Total derivatives not designated as a hedge: (2 ) (1 ) Total Derivatives (2 ) (7 )
Effect on Consolidated Statements of Income of Derivative Instruments	The effect on the consolidated statements of income for the year ended December 31, 2020 and December 31, 2019 and on the “Accumulated other comprehensive income (loss)” (“AOCI”) as reported in the consolidated statements of equity as at December 31, 2020 and December 31, 2019 of derivative instruments designated as cash flow hedge is presented in the table below: Gain (loss) deferred in OCI on derivative Location of gain (loss) reclassified from OCI into earnings Gain (loss) reclassified from OCI into earnings December 31, 2020 December 31, 2019 December 31, 2020 December 31, 2019 Foreign exchange forward contracts 29 (1 ) Cost of sales (2 ) (36 ) Foreign exchange forward contracts 3 — Selling, general and administrative 1 (4 ) Foreign exchange forward contracts 11 (1 ) Research and development 2 (15 ) Currency collars 11 (1 ) Cost of sales (1 ) (15 ) Currency collars 1 — Selling, general and administrative — (2 ) Currency collars 6 — Research and development — (7 ) Total 61 (3 ) — (79 )
Effect on Consolidated Statements of Income of Derivative Instruments Not Designated as Hedge	The effect on the consolidated statements of income for the year ended December 31, 2020 and December 31, 2019 of derivative instruments not designated as a hedge is presented in the table below: Location of gain (loss) recognized in earnings Gain (loss) recognized in earnings December 31, 2020 December 31, 2019 Foreign exchange forward contracts Other income and expenses, net (13 ) 1 Total (13 ) 1
Schedule of Financial Assets (Liabilities) Measured at Fair Value on Recurring Basis	The table below details financial assets (liabilities) measured at fair value on a recurring basis as at December 31, 2020: Fair Value Measurements using December 31, 2020 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Marketable securities – U.S. Treasury debt securities 133 133 — — Short-term deposits 581 581 — — Equity securities measured at fair value through earnings 25 25 — — Derivative assets designated as cash flow hedge 55 — 55 — Derivative assets not designated as cash flow hedge 10 — 10 — Derivative liabilities designated as cash flow hedge — — — — Derivative liabilities not designated as cash flow hedge (2 ) — (2 ) — Contingent consideration on business acquisitions (123 ) — — (123 ) Total 679 739 63 (123 ) The table below details financial assets (liabilities) measured at fair value on a recurring basis as at December 31, 2019: Fair Value Measurements using December 31, 2019 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Marketable securities – U.S. Treasury debt securities 133 133 — — Short-term deposits 4 4 — — Equity securities measured at fair value through earnings 23 23 — — Derivative assets designated as cash flow hedge 5 — 5 — Derivative assets not designated as cash flow hedge 3 — 3 — Derivative liabilities designated as cash flow hedge (6 ) — (6 ) — Derivative liabilities not designated as cash flow hedge (1 ) — (1 ) — Total 161 160 1 —
Schedule of Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3)	For liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3), the reconciliation between January 1, 2020 and December 31, 2020 is presented as follows: Fair Value Measurements using Significant Unobservable Inputs (Level 3) January 1, 2020 — Contingent consideration on business combinations 117 Changes in fair value measurement 1 Currency translation adjustment 5 December 31, 2020 123 Amount of total losses for the period included in earnings attributable to liabilities still held at the reporting date 1
Fair Value Information on Other Financial Assets and Liabilities Recorded at Amortized Cost	The following table includes additional fair value information on financial assets and liabilities as at December 31, 2020 and 2019: 2020 2019 Level Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair Value Cash equivalents (1) 1 2,637 2,637 1,691 1,691 Short-term, deposits 1 581 581 4 4 Long-term debt – Bank loans (including current portion) 2 583 583 718 718 – Senior unsecured convertible bonds issued on July 3, 2017 (Tranche A) (2) 1 — — 700 1,030 – Senior unsecured convertible bonds issued on July 3, 2017 (Tranche B) (3) 1 674 1,359 654 1,073 – Senior unsecured convertible bonds issued on August 4, 2020 (4) 1 1,364 1,835 — — (1) (2) (3) (4)
Schedule of Methodologies Used to Estimate Fair Value	The methodologies used to estimate fair value are as follows: Components Methodology used to estimate fair value Debt securities classified as available-for-sale Quoted market prices for identical instruments Foreign exchange forward contracts, currency options and collars Quoted market prices for similar instruments Equity securities measured at fair value through earnings Quoted market prices for identical instruments Equity securities carried at cost as a measurement alternative Valuation of the underlying investments on a new round of third-party financing or upon liquidation Long-term debt and current portion of long-term debt Future cash flows on a borrowing-by-borrowing basis and discounting these future cash flows using the Company's incremental borrowing rates for similar types of borrowing arrangements Cash and cash equivalents, accounts receivable, short-term borrowings, and accounts payable The carrying amounts reflected in the consolidated financial statements are considered as reasonable estimates of fair value due to the relatively short period of time between the origination of the instruments and their expected realization.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
Related Party Transactions (Tables)	Dec. 31, 2020
Related Party Transactions [Abstract]
Transactions with Significant Shareholders, their Affiliates and Other Related Parties	Transactions with significant shareholders, their affiliates and other related parties were as follows: December 31, December 31, December 31, 2020 2019 2018 Sales & other services 5 2 — Other purchases 21 18 15 Accounts receivable 1 — 2 Accounts payable — — 52

Accounting Policies - Additiona

Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Summary Of Accounting Policies [Line Items]
Sustainability threshold for uncertain tax position	50.00%
Cumulative probability threshold for realization of income tax benefits	50.00%
Operating and financing option to extend	true
Lease payments excluded from the recognition on balance sheet	$ 5,000
Employees average service period to grant awards	3 years
Advertising expenses	$ 12,000,000	$ 17,000,000	$ 15,000,000
Retained earnings	$ 3,599,000,000	$ 2,747,000,000
Accounting Standards Update 2016-13 [Member]
Summary Of Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Summary Of Accounting Policies [Line Items]
Retained earnings				$ 0
Accounting Standards Update 2018-15 [Member]
Summary Of Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]	us-gaap:AccountingStandardsUpdate201815ProspectiveMember
Accounting Standards Update 2017-04 [Member]
Summary Of Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2020
Change in accounting principle, accounting standards update, immaterial effect	true
French [Member] \| Research tax credits [Member]
Summary Of Accounting Policies [Line Items]
Tax credit carryforward expiration term	3 years
Minimum [Member]
Summary Of Accounting Policies [Line Items]
Revenue recognition expected payment terms	30 days
Equity investments, Ownership percentage	20.00%
Maximum [Member]
Summary Of Accounting Policies [Line Items]
Revenue recognition expected payment terms	90 days
Equity investments, Ownership percentage	50.00%
Maximum [Member] \| Property Plant And Equipment [Member]
Summary Of Accounting Policies [Line Items]
Short term lease payments excluding capitalization amount	$ 5,000
Trademarks and Licenses [Member] \| Minimum [Member]
Summary Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	3 years
Trademarks and Licenses [Member] \| Maximum [Member]
Summary Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	8 years
Purchased and Internally Developed Software [Member] \| Maximum [Member]
Summary Of Accounting Policies [Line Items]
Estimated useful lives of intangible assets	4 years

Accounting Policies - Schedule

Accounting Policies - Schedule of Property, Plant and Equipment Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2020
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	33 years
Facilities and Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	5 years
Facilities and Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	10 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	2 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	10 years
Computer and R&D Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	3 years
Computer and R&D Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	6 years
Other [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	2 years
Other [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of Property, Plant and Equipment, Average	5 years

Short-Term Deposits and Marke_3

Short-Term Deposits and Marketable Securities - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable Recorded Investment [Line Items]
Short-term deposits	$ 581,000,000	$ 4,000,000
Marketable securities	133,000,000	133,000,000	$ 330,000,000
Proceeds from matured marketable securities		200,000,000	100,000,000
Investment of available cash in short-term deposits	581,000,000
Debt securities, allowance recognized	0
U.S. Treasury Debt Securities [Member]
Financing Receivable Recorded Investment [Line Items]
Marketable securities	$ 133,000,000	133,000,000	$ 330,000,000
Proceeds from matured marketable securities		$ 200,000,000
Weighted average maturity period	6 months
Aggregate amortized cost basis of securities	$ 132,000,000

Short-Term Deposits and Marke_4

Short-Term Deposits and Marketable Securities - Changes in Value of Marketable Securities Reported in Current Assets on Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Marketable Securities [Line Items]
Beginning Balance	$ 330
Proceeds at maturity	(200)	$ (100)
Change in fair value included in OCI	3
Ending Balance	133	330
U.S. Treasury Debt Securities [Member]
Marketable Securities [Line Items]
Beginning Balance	330
Proceeds at maturity	(200)
Change in fair value included in OCI	3
Ending Balance	$ 133	$ 330

Trade Accounts Receivable, Ne_2

Trade Accounts Receivable, Net - Trade Accounts Receivable, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Trade accounts receivable	$ 1,481	$ 1,396
Current expected credit losses allowance ("CECLA")*	(16)	(16)
Total	$ 1,465	$ 1,380

Trade Accounts Receivable, Ne_3

Trade Accounts Receivable, Net - Schedule of Changes in Reported CECLA (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts/CECLA as at December 31, 2019	$ (16)
Current-period adjustment to CECLA	0
Allowance for doubtful accounts/CECLA as at December 31, 2020	(16)
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for doubtful accounts/CECLA as at December 31, 2019	$ (16)

Trade Accounts Receivable, Ne_4

Trade Accounts Receivable, Net - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)Customer	Dec. 31, 2019USD ($)Customer	Dec. 31, 2018Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables sold without recourse \| $	$ 0	$ 75,000,000
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Share of companies in consolidated net revenues	23.90%	17.60%	13.10%
Number of customers \| Customer	1	1	1

Inventories - Inventories (Deta

Inventories - Inventories (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 175	$ 137
Work-in-process	1,120	1,104
Finished products	546	450
Total	$ 1,841	$ 1,691

Other Current Assets - Other Cu

Other Current Assets - Other Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Receivables from government agencies	$ 244	$ 216
Taxes and other government receivables	114	71
Advances	39	47
Prepayments	70	56
Loans and deposits	8	8
Interest receivable	3	9
Derivative instruments	65	8
Other current assets	41	27
Total	$ 584	$ 442

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Millions	Dec. 02, 2019USD ($)	Feb. 06, 2019USD ($)	Dec. 31, 2020USD ($)Acquisition	Sep. 30, 2020Acquisition	Jun. 30, 2020Acquisition	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Business acquisitions, deferred consideration			$ 20			$ 20
Payment for business acquisitions, net of cash and cash equivalents acquired						113	$ 127
Deferred and contingent consideration recognized			143			143
Goodwill			$ 330			330	162	$ 121
2020 Acquisitions [Member]
Business Acquisition [Line Items]
Name of acquired entity			minor acquisition in the Microcontrollers and Digital ICs Group	entire share capital of Ultra Wide Band specialist BeSpoon, of the cellular IoT connectivity assets of Riot Micro and of the radio-frequency assets of SOMOS	French Gallium Nitride (GaN) innovator Exagan
Number of Acquisitions \| Acquisition			1	3	1
Payment for business acquisitions, before cash acquired						104
Cash acquired						1
Business acquisitions, deferred consideration			$ 18			18
Business acquisitions, contingent consideration			117			117
Payment for business acquisitions, net of cash and cash equivalents acquired						103
Deferred and contingent consideration recognized			143			143
Fair value of business acquired			239			239
Deferred tax assets			5			5
Deferred tax liabilities			18			18
Goodwill			$ 135			$ 135
2020 Acquisitions [Member] \| Discount Rate [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Discount rate			1.55			1.55
2020 Acquisitions [Member] \| Discount Rate [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Discount rate			4.07			4.07
Norstel AB [Member]
Business Acquisition [Line Items]
Cash acquired							1
Percentage of business acquired	45.00%	55.00%
Fair value of business acquired			$ 138			$ 138	138
Consideration paid	$ 51	$ 77
Deferred tax assets			4			4
Deferred tax liabilities			18			18
Increase in goodwill						14
Goodwill			$ 57			$ 57	43
Norstel AB [Member] \| Restricted Cash Current [Member]
Business Acquisition [Line Items]
Escrow account							$ 10

Business Combinations - Schedul

Business Combinations - Schedule of Preliminary Fair Value of Identifiable Assets and Assumed Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Technologies & licenses	$ 118
Goodwill	330	$ 162	$ 121
2020 Acquisitions [Member]
Business Acquisition [Line Items]
Property, plant and equipment	1
Deferred tax assets	5
Deferred tax liabilities	(18)
Net working capital	(4)
Goodwill	135
Total net assets at fair value	239
Purchase consideration	239
2020 Acquisitions [Member] \| Technologies & Licenses [Member]
Business Acquisition [Line Items]
Technologies & licenses	108
2020 Acquisitions [Member] \| Technologies in Progress [Member]
Business Acquisition [Line Items]
Technologies & licenses	10
2020 Acquisitions [Member] \| Other Intangible Assets [Member]
Business Acquisition [Line Items]
Technologies & licenses	2
Norstel AB [Member]
Business Acquisition [Line Items]
Property, plant and equipment	11	11
Deferred tax assets	4
Deferred tax liabilities	(18)
Net working capital	(2)	(2)
Goodwill	57	43
Total net assets at fair value	138	138
Purchase consideration	138	138
Norstel AB [Member] \| Measurement Period Adjustments [Member]
Business Acquisition [Line Items]
Deferred tax assets	4
Deferred tax liabilities	(18)
Goodwill	14
Norstel AB [Member] \| Technologies in Progress [Member]
Business Acquisition [Line Items]
Technologies & licenses	$ 86	$ 86

Business Combinations - Sched_2

Business Combinations - Schedule of Preliminary Fair Value of Identifiable Assets and Assumed Liabilities (Parenthetical) (Detail) $ in Millions	Dec. 31, 2020USD ($)
Automotive and Discrete Group (ADG) and Microcontrollers And Digital Ics Group [Member]
Business Acquisition [Line Items]
Goodwill estimated tax deductible	$ 45

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 162	$ 121
Business combination	149	43
Foreign currency translation	19	(2)
Goodwill, Ending Balance	330	162
Automotive and Discrete Group (ADG) [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	43
Business combination	38	43
Foreign currency translation	10
Goodwill, Ending Balance	91	43
Microcontrollers and Digital ICs Group (MDG) [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	117	119
Business combination	111
Foreign currency translation	9	(2)
Goodwill, Ending Balance	237	117
Analog, MEMS & Sensors Group (AMS) [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	2	2
Goodwill, Ending Balance	$ 2	$ 2

Goodwill - Additional Informati

Goodwill - Additional Information (Detail) - USD ($)	12 Months Ended
Goodwill - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill acquired	$ 149,000,000	$ 43,000,000
Accumulated impairment losses, net	102,000,000	102,000,000
Impairment loss of goodwill	0	0	$ 0
Norstel AB [Member]
Goodwill [Line Items]
Increase in goodwill	14,000,000
ADG and MDG Segments [Member]
Goodwill [Line Items]
Goodwill acquired	135,000,000
Microcontrollers and Digital ICs Group (MDG) [Member]
Goodwill [Line Items]
Goodwill acquired	111,000,000
Accumulated impairment losses, net	96,000,000	96,000,000
Others [Member]
Goodwill [Line Items]
Accumulated impairment losses, net	$ 6,000,000	$ 6,000,000

Other Intangible Assets, Net -

Other Intangible Assets, Net - Other Intangible Assets, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Cost	$ 1,599	$ 1,374
Accumulated Amortization	(1,154)	(1,075)
Net Cost	445	299
Technologies & Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Gross Cost	934	699
Accumulated Amortization	(623)	(578)
Net Cost	311	121
Purchased and Internally Developed Software [Member]
Finite Lived Intangible Assets [Line Items]
Gross Cost	537	486
Accumulated Amortization	(461)	(427)
Net Cost	76	59
Technologies in Progress [Member]
Finite Lived Intangible Assets [Line Items]
Gross Cost	56	119
Net Cost	56	119
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Gross Cost	72	70
Accumulated Amortization	(70)	$ (70)
Net Cost	$ 2

Other Intangible Assets, Net _2

Other Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 79	$ 69	$ 64
Technologies & Licenses [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized during acquisition	108
Technologies in Progress [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized during acquisition	10
Technologies in Progress [Member] \| Norstel [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized during acquisition		86
Other Intangible Assets [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized during acquisition	2
Acquired Licenses and Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Impairment loss of intangible assets	$ 4	$ 4	$ 2

Other Intangible Assets, Net _3

Other Intangible Assets, Net - Estimated Amortization Expense of Existing Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
2021	$ 97
2022	82
2023	64
2024	49
2025	35
Thereafter	118
Net Cost	$ 445	$ 299

Property, Plant and Equipment_3

Property, Plant and Equipment, Net - Property, Plant and Equipment, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Gross Cost	$ 22,605	$ 20,552
Accumulated Depreciation	(18,009)	(16,545)
Net Cost	4,596	4,007
Land [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	86	78
Net Cost	86	78
Buildings [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	995	905
Accumulated Depreciation	(567)	(505)
Net Cost	428	400
Facilities and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	3,545	3,193
Accumulated Depreciation	(3,038)	(2,762)
Net Cost	507	431
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	16,689	15,336
Accumulated Depreciation	(13,859)	(12,790)
Net Cost	2,830	2,546
Computer and R&D Equipment [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	402	382
Accumulated Depreciation	(347)	(335)
Net Cost	55	47
Operating Lease Right-of-Use Assets [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	290	266
Accumulated Depreciation	(99)	(60)
Net Cost	191	206
Other Tangible Assets [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	118	110
Accumulated Depreciation	(99)	(93)
Net Cost	19	17
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Gross Cost	480	282
Net Cost	$ 480	$ 282

Property, Plant and Equipment_4

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Depreciation charge	$ 844,000,000	$ 785,000,000	$ 727,000,000
Tax incentives and capital investment funding	10,000,000	54,000,000	149,000,000
Reduction in depreciation charges due to public funding	59,000,000	53,000,000	42,000,000
Cash proceeds from sale of property, plant and equipment	4,000,000	7,000,000	1,000,000
Impairment of long-lived assets	$ 0	$ 3,000,000	$ 0

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($)	12 Months Ended
Leases - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Operating and financing option to extend	true
Operating and financing option to extend, description	Certain lease contracts contain options to extend the leases by up to 30 years, which the Company has included in the lease term when it is reasonably certain for the Company to exercise that option.
Lease payments excluded from the capitalization	$ 5,000
Minimum [Member]
Lessee Lease Description [Line Items]
Operating and financing remaining lease term contract	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Operating and financing remaining lease term contract	49 years
Operating and financing option to extend, period	30 years
Finance lease right-of-use assets	$ 1,000,000	$ 1,000,000

Leases - Schedule of Operating

Leases - Schedule of Operating Lease (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee Disclosure [Abstract]
Right-of-use assets	$ 191	$ 206
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet	us-gaap:PropertyPlantAndEquipmentNet
Current	$ 54	$ 55
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Non-current	$ 142	$ 152
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities	$ 196	$ 207

Leases - Schedule of Maturities

Leases - Schedule of Maturities of Operating Lease Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee Disclosure [Abstract]
2021	$ 58
2022	44
2023	32
2024	21
2025	13
Thereafter	76
Total future undiscounted cash outflows	244
Effect of discounting	(48)
Total operating lease liabilities	$ 196	$ 207

Leases - Schedule of Operatin_2

Leases - Schedule of Operating Lease Term and Discount Rate (Detail)	Dec. 31, 2020	Dec. 31, 2019
Lessee Disclosure [Abstract]
Weighted average remaining lease term (in years)	9 years 3 days	9 years 3 months 3 days
Weighted average discount rate	2.71%	2.79%

Leases - Schedule of Operatin_3

Leases - Schedule of Operating Lease Cost and Cash Paid (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee Disclosure [Abstract]
Operating lease cost	$ 65	$ 65
Operating lease cash paid	$ 65	$ 65

Leases - Schedule of Right-of-U

Leases - Schedule of Right-of-Use Assets Obtained in Exchange for New Operating Lease Liabilities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee Disclosure [Abstract]
Operating leases	$ 40	$ 38

Long-Term Investments - Long-Te

Long-Term Investments - Long-Term Investments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Long-term investments	$ 10	$ 11

Other Non-Current Assets - Othe

Other Non-Current Assets - Other Non-Current Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Equity securities	$ 25	$ 23
Long-term State receivables	623	358
Deposits and other non-current assets	76	56
Total	$ 724	$ 437

Other Non-Current Assets - Addi

Other Non-Current Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Non-current assets sold without recourse	$ 96,000,000	$ 131,000,000
Minimum [Member]
Long-term receivables expected collection period	1 year
Maximum [Member]
Non-current assets sold , cost	$ 1,000,000	$ 1,000,000

Other Payables and Accrued Li_3

Other Payables and Accrued Liabilities - Other Payables and Accrued Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Payables And Accruals [Line Items]
Employee related liabilities	$ 467	$ 375
Employee compensated absences	164	138
Taxes other than income taxes	58	53
Advances	75	63
Derivative instruments	2	7
Provision for restructuring	4	10
Defined benefit plans – current portion	9	10
Defined contribution plans – accrued benefits	23	20
Royalties	24	21
Current lease liabilities	54	55
Deferred consideration for business combinations		10
Others	82	62
Total	966	831
Other Long-Term Employee Benefit [Member]
Payables And Accruals [Line Items]
Other long-term benefits – current portion	$ 4	$ 7

Long-Term Debt - Long-Term Debt

Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Aug. 04, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total long-term debt	$ 2,621		$ 2,072
Less current portion	(795)		(173)
Total long-term debt, less current portion	1,826		1,899
Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds		$ 1,500
1.36% due 2020, floating interest rate at Libor + 1.099% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank			13
1.20% due 2020, floating interest rate at Libor + 0.956% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank			28
0.37% due 2020, floating interest rate at Euribor + 0.817% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank			14
0.77% due 2021, floating interest rate at Libor + 0.525% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank	30		60
0.83% due 2021, floating interest rate at Libor + 0.572% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank	29		58
0.09% due 2028, floating interest rate at Euribor + 0.589% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank	250		258
0.22% due 2029, floating interest rate at Euribor + 0.564% [Member]
Debt Instrument [Line Items]
Funding program loans from European Investment Bank	270		275
Zero-coupon, due 2022 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds			700
0.25% due 2024 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds	674		654
Zero-coupon, due 2025 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds	703
Zero-coupon, due 2027 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds	661
0.48% (weighted average), due 2021-2028, fixed interest rate [Member]
Debt Instrument [Line Items]
Other Loans Payable	$ 4		$ 12

Long-Term Debt - Long-Term De_2

Long-Term Debt - Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
Long-Term Debt - Long-Term Debt (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2017	Jul. 03, 2017
1.36% due 2020, floating interest rate at Libor + 1.099% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2020
Interest rate	1.36%
Description of floating rate basis	Libor + 1.099%
Basis spread on floating rate	1.099%
1.20% due 2020, floating interest rate at Libor + 0.956% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2020
Interest rate	1.20%
Description of floating rate basis	Libor + 0.956%
Basis spread on floating rate	0.956%
0.37% due 2020, floating interest rate at Euribor + 0.817% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2020
Interest rate	0.37%
Description of floating rate basis	Euribor + 0.817%
Basis spread on floating rate	0.817%
0.77% due 2021, floating interest rate at Libor + 0.525% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2021
Interest rate	0.77%
Description of floating rate basis	Libor + 0.525%
Basis spread on floating rate	0.525%
0.83% due 2021, floating interest rate at Libor + 0.572% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2021
Interest rate	0.83%
Description of floating rate basis	Libor + 0.572%
Basis spread on floating rate	0.572%
0.09% due 2028, floating interest rate at Euribor + 0.589% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2028
Interest rate	0.09%
Description of floating rate basis	Euribor + 0.589%
Basis spread on floating rate	0.589%
0.22% due 2029, floating interest rate at Euribor + 0.564% [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2029
Interest rate	0.22%
Description of floating rate basis	Euribor + 0.564%
Basis spread on floating rate	0.564%
Zero-coupon, due 2022 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2022	2022
Interest rate	0.00%
0.25% due 2024 (Tranche B) [Member]
Debt Instrument [Line Items]
Interest rate			0.25%
0.25% due 2024 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2024
Interest rate	0.25%
Zero-coupon, due 2025 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2025
Interest rate	0.00%
0.48% (weighted average), due 2021-2028, fixed interest rate [Member]
Debt Instrument [Line Items]
Interest rate	0.48%
0.48% (weighted average), due 2021-2028, fixed interest rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2021
0.48% (weighted average), due 2021-2028, fixed interest rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2028
Zero-coupon, due 2027 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date	2027
Interest rate	0.00%

Long-Term Debt - Long-Term De_3

Long-Term Debt - Long-Term Debt Denominated by Currencies (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,621	$ 2,072
U.S. dollar [Member]
Debt Instrument [Line Items]
Long-term debt	2,097	1,513
Euro [Member]
Debt Instrument [Line Items]
Long-term debt	$ 524	$ 559

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) $ / shares in Units, € in Millions	Aug. 04, 2020USD ($)$ / sharesshares	Jul. 03, 2017USD ($)$ / sharesshares	Jul. 31, 2020USD ($)shares	Dec. 31, 2020USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017	Feb. 24, 2021EUR (€)	Dec. 31, 2020EUR (€)	Aug. 01, 2017EUR (€)	Mar. 12, 2013USD ($)	Mar. 12, 2013EUR (€)
Debt Instrument [Line Items]
Conversion features of the instruments value	$ 215,000,000	$ 242,000,000		$ 184,000,000
Allocated debt issuance costs	1,000,000	1,000,000
Loss on financial instruments, net				(26,000,000)	$ (1,000,000)
Allocated debt deferred tax effect	30,000,000
Unamortized debt discount and issuance costs totaled				212,000,000
Medium Term Credit Facilities [Member]
Debt Instrument [Line Items]
Unutilized committed medium term credit facilities				1,200,000,000
Multi Currency Loan to Support our Industrial and R&D Programs [Member]
Debt Instrument [Line Items]
Amount outstanding				59,000,000
Line of credit amount withdrawn										$ 471,000,000
Line of credit outstanding amount \| €											€ 350
Multi Currency Loan to Support our Industrial and R&D Programs [Member] \| Europe [Member]
Debt Instrument [Line Items]
Line of credit amount withdrawn				321,000,000				€ 100
Line of credit outstanding amount				520,000,000				€ 350	€ 500
Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Fair value of liability component	1,362,000,000	1,266,000,000
Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount				750,000,000
Net proceeds from issuance of senior unsecured convertible bonds	1,567,000,000	$ 1,502,000,000
Zero-coupon, due 2022 (Tranche A) [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds conversion premium rate		37.50%
Debt conversion, bond par value			$ 750,000,000
Conversion features of the instruments value			$ 0
Zero-coupon, due 2022 (Tranche A) [Member] \| Treasury Stock [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued \| shares			11,400,000
Zero-coupon, due 2022 (Tranche A) [Member] \| Fair Value, Inputs, Level 3 [Member]
Debt Instrument [Line Items]
Fair value of liability component			$ 739,000,000
Loss on financial instruments, net				$ 25,000,000
Zero-coupon, due 2022 (Tranche A) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate		0.0270	0.008
Zero-coupon, due 2022 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount		$ 750,000,000
0.25%, due 2024 (Tranche B) [Member]
Debt Instrument [Line Items]
Debt instrument periodic payment				semi-annually
Senior unsecured convertible bonds conversion premium rate		37.50%
0.25%, due 2024 (Tranche B) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate		0.0328
0.25%, due 2024 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount		$ 750,000,000
Long-term debt maturity date						2024
Interest rate		0.25%
Dual Tranche Senior Unsecured Convertible Bonds \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 1,500,000,000	$ 1,500,000,000
Senior unsecured convertible bonds conversion price \| $ / shares		$ 20.54
Zero-coupon, due 2022 (Tranche A) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate	0.0130
Zero-coupon, due 2022 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date				2022		2022
Interest rate				0.00%				0.00%
Zero Coupon Due Two Thousand Nineteen Tranche A \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Percentage at which bonds issued		101.265%
Tranche Two
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued \| shares		9,737
Tranche One
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued \| shares		9,737
Debt conversion, bond par value		$ 200,000
0.25% due 2024 (Tranche B) [Member]
Debt Instrument [Line Items]
Interest rate		0.25%
0.25% due 2024 (Tranche B) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate	0.0185
0.25% due 2024 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Long-term debt maturity date				2024
Interest rate				0.25%				0.25%
Zero-coupon, due 2025 (Tranche A) [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds conversion premium rate	47.50%
Debt Conversion, Converted Instrument, Shares Issued \| shares	4,585
Debt conversion, bond par value	$ 200,000
Zero-coupon, due 2025 (Tranche A) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate	0.0130
Zero-coupon, due 2025 (Tranche A) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 750,000,000
Long-term debt maturity date				2025
Percentage at which bonds issued	105.80%
Interest rate				0.00%				0.00%
Senior unsecured convertible bonds conversion price \| $ / shares	$ 43.62
Zero-coupon, due 2027 (Tranche B) [Member]
Debt Instrument [Line Items]
Senior unsecured convertible bonds conversion price \| $ / shares	$ 45.10
Senior unsecured convertible bonds conversion premium rate	52.50%
Debt Conversion, Converted Instrument, Shares Issued \| shares	4,435
Debt conversion, bond par value	$ 200,000
Zero-coupon, due 2027 (Tranche B) [Member] \| Measurement Input, Discount Rate [Member]
Debt Instrument [Line Items]
Debt discount rate	0.0185
Zero-coupon, due 2027 (Tranche B) [Member] \| Senior Unsecured Convertible Bonds [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 750,000,000
Long-term debt maturity date				2027
Percentage at which bonds issued	104.50%
Interest rate				0.00%				0.00%
New Medium Term Credit Facility [Member] \| Medium Term Credit Facilities [Member]
Debt Instrument [Line Items]
Unutilized committed medium term credit facilities \| €								€ 500
Amount outstanding \| €								€ 500
New Medium Term Credit Facility [Member] \| Medium Term Credit Facilities [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit amount withdrawn \| €							€ 335

Long-Term Debt - Total Long-Ter

Long-Term Debt - Total Long-Term Debt Outstanding Maturities (Detail) $ in Millions	Dec. 31, 2020USD ($)
Debt Disclosure [Abstract]
2021	$ 121
2022	62
2023	62
2024	812
2025	812
Thereafter	965
Total	$ 2,834

Post-Employment and Other Lon_3

Post-Employment and Other Long-Term Employees Benefits - Changes in Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in plan assets:
Plan assets at fair value at beginning of year	$ 597
Foreign currency translation adjustments	0	$ 0
Plan assets at fair value at end of year	718	597
Net amount recognized in the balance sheet consisted of the following:
Long-term liabilities	(97)	(81)
Pension Benefits [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	1,036	911
Service cost	31	27	$ 27
Interest cost	21	24	24
Employee contributions	4	3
Plan amendments	1	1
Benefits paid	(13)	(15)
Effect of settlement	(2)	(36)
Actuarial (gain) loss	83	117
Foreign currency translation adjustment	55	4
Benefit obligation at end of year	1,216	1,036	911
Change in plan assets:
Plan assets at fair value at beginning of year	597	527
Actual return on plan assets	84	81
Employer contributions	17	21
Employee contributions	4	3
Benefits paid	(3)	(5)
Effect of settlement		(36)
Foreign currency translation adjustments	19	6
Plan assets at fair value at end of year	718	597	527
Funded status	(498)	(439)
Net amount recognized in the balance sheet consisted of the following:
Non-current assets	4	4
Current liabilities	(9)	(10)
Long-term liabilities	(493)	(433)
Net amount recognized	(498)	(439)
Other Long-Term Employee Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	88	81
Service cost	11	5	6
Interest cost	1	1	1
Benefits paid	(11)	(4)
Actuarial (gain) loss	3	6
Foreign currency translation adjustment	9	(1)
Benefit obligation at end of year	101	88	$ 81
Change in plan assets:
Funded status	(101)	(88)
Net amount recognized in the balance sheet consisted of the following:
Current liabilities	(4)	(7)
Long-term liabilities	(97)	(81)
Net amount recognized	$ (101)	$ (88)

Post-Employment and Other Lon_4

Post-Employment and Other Long-Term Employees Benefits - Accumulated Other Comprehensive Income (Loss) Before Tax Effects (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Accumulated other comprehensive loss, actuarial (gains)/losses, beginning balance	$ 197	$ 152
Net amount generated/arising in current year, actuarial (gains)/losses	21	57
Amortization, actuarial (gains)/losses	(13)	(13)
Foreign currency translation, actuarial (gains)/losses before tax	11	1
Accumulated other comprehensive loss, actuarial (gains)/losses, ending balance	216	197
Accumulated other comprehensive loss, prior service cost, beginning balance	3	3
Net amount generated/arising in current year, prior service cost	1	1
Amortization, prior service cost	(1)	(1)
Foreign currency translation adjustments	0	0
Accumulated other comprehensive loss, prior service cost, ending balance	3	3
Accumulated other comprehensive loss Total, beginning balance	200	155
Net amount generated/arising in current year, Total	22	58
Amortization, Total	(14)	(14)
Foreign currency translation adjustment, Total	11	1
Accumulated other comprehensive loss Total, ending balance	$ 219	$ 200

Post-Employment and Other Lon_5

Post-Employment and Other Long-Term Employees Benefits - Schedule of Accumulated Benefit Obligations (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	$ 1,053	$ 896
Other Long-Term Employee Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligations	$ 83	$ 74

Post-Employment and Other Lon_6

Post-Employment and Other Long-Term Employees Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	$ 773	$ 952
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets	327	562
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	675	562
Pension benefits components other than service cost,	12	16	$ 11
Accrued benefits related to defined contribution pension plans	23	20
Annual cost of defined contribution plans	91	86	$ 84
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension plans with benefit obligations in excess of plan assets, benefit obligation	1,177	1,005
Employer contributions	17	$ 21
Expected contribution in cash	$ 22

Post-Employment and Other Lon_7

Post-Employment and Other Long-Term Employees Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 31	$ 27	$ 27
Interest cost	21	24	24
Expected return on plan assets	(23)	(22)	(23)
Amortization of actuarial net loss (gain)	12	10	8
Amortization of prior service cost	1	1	1
Effect of settlement	1	3
Effect of curtailment			1
Net periodic benefit cost	43	43	38
Other Long-Term Employee Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	5	6
Interest cost	1	1	1
Amortization of actuarial net loss (gain)	3	7	1
Net periodic benefit cost	$ 15	$ 13	$ 8

Post-Employment and Other Lon_8

Post-Employment and Other Long-Term Employees Benefits - Weighted Average Assumptions Used in Determination of Benefit Obligation and Plan Assets (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
Discount rate	1.45%	1.95%
Salary increase rate	2.43%	2.48%
Expected long-term rate of return on funds for the pension expense of the following year	3.44%	4.04%
Net periodic benefit cost, Discount rate	1.95%	2.75%	2.54%
Net periodic benefit cost, Salary increase rate	2.48%	2.32%	2.37%
Net periodic benefit cost, Expected long-term rate of return on funds for the pension expense of the year	4.04%	4.16%	4.23%

Post-Employment and Other Lon_9

Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation (Detail)	Dec. 31, 2020	Dec. 31, 2019
Allocation of pension plan assets	100.00%	100.00%
Cash and Cash Equivalents [Member]
Allocation of pension plan assets	1.00%	1.00%
Equity Securities [Member]
Allocation of pension plan assets	23.00%	24.00%
Government Debt Securities [Member]
Allocation of pension plan assets	12.00%	12.00%
Corporate Debt Securities [Member]
Allocation of pension plan assets	15.00%	16.00%
Investment Funds [Member]
Allocation of pension plan assets	21.00%	21.00%
Real Estate [Member]
Allocation of pension plan assets	2.00%	2.00%
Other (Mainly Insurance Assets - Contracts and Reserves) [Member]
Allocation of pension plan assets	26.00%	24.00%

Post-Employment and Other Lo_10

Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2019
Corporate Bonds [Member]
Defined benefit plan, plan assets target allocation percentage	72.00%	37.00%
Government Bonds [Member]
Defined benefit plan, plan assets target allocation percentage		32.00%
Equity [Member]
Defined benefit plan, plan assets target allocation percentage	13.00%	15.00%
Other Instruments [Member]
Defined benefit plan, plan assets target allocation percentage	15.00%	16.00%

Post-Employment and Other Lo_11

Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation Including Fair-Value Measurements (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 718	$ 597
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4	5
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	167	144
Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	86	74
Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	105	95
Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	153	127
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	11	10
Other (Mainly Insurance Assets - Contracts and Reserves) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	192	142
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9	7
Fair Value, Inputs, Level 1 [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4	5
Fair Value, Inputs, Level 1 [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2	1
Fair Value, Inputs, Level 1 [Member] \| Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3	1
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	547	477
Fair Value, Inputs, Level 2 [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	165	143
Fair Value, Inputs, Level 2 [Member] \| Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	86	74
Fair Value, Inputs, Level 2 [Member] \| Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	81	83
Fair Value, Inputs, Level 2 [Member] \| Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	150	126
Fair Value, Inputs, Level 2 [Member] \| Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	11	10
Fair Value, Inputs, Level 2 [Member] \| Other (Mainly Insurance Assets - Contracts and Reserves) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	54	41
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	162	113	$ 117
Fair Value, Inputs, Level 3 [Member] \| Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	24	12
Fair Value, Inputs, Level 3 [Member] \| Other (Mainly Insurance Assets - Contracts and Reserves) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 138	$ 101

Post-Employment and Other Lo_12

Post-Employment and Other Long-Term Employees Benefits - Reconciliation for Plan Assets Measured at Fair Value Using Unobservable Inputs (Level 3) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value at beginning of year	$ 597
Foreign currency translation adjustment	0	$ 0
Plan assets at fair value at end of year	718	597
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value at beginning of year	113	117
Contributions (employer and employee)	14	11
Actual return on plan assets	2	(1)
Net benefit payments	11	9
Settlements		(34)
Transfer in Level 3	10	11
Foreign currency translation adjustment	12
Plan assets at fair value at end of year	$ 162	$ 113

Post-Employment and Other Lo_13

Post-Employment and Other Long-Term Employees Benefits - Estimated Future Benefit Payments (Detail) $ in Millions	Dec. 31, 2020USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2021	$ 38
2022	30
2023	40
2024	51
2025	56
From 2026 to 2030	298
Other Long-Term Employee Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
2021	5
2022	5
2023	6
2024	9
2025	9
From 2026 to 2030	$ 49

Other Long-Term Liabilities - S

Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]
Non-current	$ 142	$ 152
Contingent consideration on business combinations	123
Deferred consideration	20
Other long-term employee benefits	97	81
Long-term liability related to public funding	42	47
Provision for restructuring		1
Others	64	49
Total	$ 488	$ 330

Other Long-Term Liabilities - A

Other Long-Term Liabilities - Additional Information (Detail) $ in Millions	Dec. 31, 2020USD ($)
Other Liabilities Noncurrent [Abstract]
Deferred and contingent consideration related to business acquisitions	$ 143

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail)	Jun. 17, 2020$ / shares	May 31, 2019$ / shares	Mar. 27, 2019$ / shares	Nov. 05, 2018USD ($)	May 31, 2018$ / shares	Mar. 27, 2018$ / shares	Jun. 20, 2017$ / shares	Jan. 22, 2007	Oct. 31, 2016	Mar. 31, 2021$ / shares	Dec. 31, 2020USD ($)$ / sharesshares	Sep. 30, 2020$ / shares	Jun. 30, 2020$ / shares	Mar. 31, 2020$ / shares	Dec. 31, 2019USD ($)$ / sharesshares	Sep. 30, 2019$ / shares	Jun. 30, 2019$ / shares	Mar. 31, 2019$ / shares	Dec. 31, 2018USD ($)$ / shares	Sep. 30, 2018$ / shares	Jun. 30, 2018$ / shares	Mar. 31, 2018$ / shares	Dec. 31, 2017$ / shares	Sep. 30, 2017$ / shares	Jun. 30, 2017$ / shares	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2007	Dec. 31, 2020EUR (€)€ / sharesshares	Dec. 31, 2019€ / shares	May 20, 2012	May 20, 2011	May 20, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Authorized share capital \| €																																		€ 1,810,000,000
Common stock, shares authorized											1,200,000,000				1,200,000,000														1,200,000,000	1,200,000,000				1,200,000,000
Preference stock, shares authorized											540,000,000				540,000,000														540,000,000	540,000,000				540,000,000
Common stock, nominal value \| € / shares																																		€ 1.04	€ 1.04
Common stock, shares issued											911,239,420				911,186,920														911,239,420	911,186,920				911,239,420
Common stock, shares outstanding											905,415,002				891,434,489														905,415,002	891,434,489				905,415,002
Shares issued as a percentage of par value of the preference shares to be issued								25.00%
Preference shares outstanding maximum period																																	2 years
Expiration period of options after date of grant, in years								10 years
Expiration extended period of options after date of grant,in years									10 years
Preference share issued											0				0														0	0				0
Company owned treasury stock											5,824,418				19,752,431														5,824,418	19,752,431				5,824,418
Transfer of treasury shares to employees under the Company's share based remuneration programs															60,484,598															60,484,598
Transfer of treasury shares to employees under the Company's share based remuneration during the year																														7,260,486
Period of buy-back program				3 years
Stock Repurchase Program, Remaining Authorized Repurchase Amount \| $				$ 750,000,000							$ 125,000,000																		$ 125,000,000
Number of common shares authorized to repurchase											4,800,000																		4,800,000					4,800,000
Total intrinsic value of options exercised \| $											$ 2,000,000				$ 1,000,000				$ 1,000,000										$ 2,000,000	$ 1,000,000	$ 1,000,000
Total intrinsic value of options outstanding \| $											2,000,000				3,000,000														2,000,000	3,000,000
Fair value of shares vested \| $																													141,000,000	114,000,000	68,000,000
Compensation cost, excluding payroll tax and social contribution, capitalized as part of inventory \| $											6,000,000				$ 6,000,000				$ 6,000,000										6,000,000	6,000,000	6,000,000
Total unrecognized compensation cost related to the grant of unvested shares \| $											$ 182,000,000																		$ 182,000,000
Employee service share-based compensation, unvested awards, total compensation cost not yet recognized, period for recognition																													9 months
Deferred income tax benefit relating to unvested share based compensation expense \| $																													$ 10,000,000	9,000,000	7,000,000
Dividends, per share \| $ / shares	$ 0.168	$ 0.24			$ 0.24		$ 0.24				$ 0.042	$ 0.042	$ 0.042	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.06
Dividends payable to stockholders \| $											$ 42,000,000				$ 58,000,000														42,000,000	58,000,000
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, per share \| $ / shares										$ 0.042
Dividend Distribution First Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid \| $																													37,000,000	53,000,000	54,000,000	$ 53,000,000
Dividend Distribution Second Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid \| $																													38,000,000	53,000,000	54,000,000	53,000,000
Dividend Distribution Third Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid \| $																													34,000,000	$ 48,000,000	$ 48,000,000	$ 47,000,000
Dividend Distribution Remaining Portion of Third Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid \| $																										$ 6,000,000	$ 6,000,000	$ 7,000,000
Dividends payable to stockholders \| $											4,000,000																		4,000,000
Dividend Distribution of Last Installment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend paid \| $																										$ 53,000,000	$ 54,000,000	$ 53,000,000
Dividends payable to stockholders \| $											$ 38,000,000																		$ 38,000,000
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transfer of treasury shares to employees under the Company's share based remuneration during the year																													7,260,486
Vesting period of awards																													3 years
Vesting schedule for Supervisory Board																													one third of the total number of awards granted
Weighted average grant-date fair value of nonvested shares granted to employees under Employee Plan \| $ / shares																														$ 14.97
Supervisory Board 2012 Plan [Member] \| Supervisory Board [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards are granted at the nominal value of the share \| € / shares																																		€ 1.04
Vesting period of awards																													3 years
Vesting schedule for Supervisory Board																													one third every year
Employee Plan 2009 [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sub plan for employees of Company's European subsidiaries for statutory payroll tax purposes nonvested shares vested over requisite service period																																				32.00%	32.00%	36.00%
Employee Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of nonvested shares granted to employees under Employee Plan \| $ / shares						$ 16.52
Employee Plan 2017 [Member] \| Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to vest						100.00%
Employee Plan 2017 [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transfer of treasury shares to employees under the Company's share based remuneration during the year																													2,633,745
Employee Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of nonvested shares granted to employees under Employee Plan \| $ / shares			$ 22.78
Employee Plan 2018 [Member] \| Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to vest			100.00%
Employee Plan 2018 [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transfer of treasury shares to employees under the Company's share based remuneration during the year																													2,442,327
Employee Plan 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of nonvested shares granted to employees under Employee Plan \| $ / shares																														$ 19.28
Employee Plan 2019 [Member] \| Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to vest																														66.67%
Employee Plan 2019 [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transfer of treasury shares to employees under the Company's share based remuneration during the year																													2,172,160
Employee Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of nonvested shares granted to employees under Employee Plan \| $ / shares																													$ 30.17
Options expected to vest, options (in shares)											3,605,365																		3,605,365					3,605,365
Employee Plan 2020 [Member] \| Performance Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares to vest																													66.67%
Employee Plan 2020 [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Transfer of treasury shares to employees under the Company's share based remuneration during the year																													600
Tranche A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company owned treasury stock											11,400,000																		11,400,000					11,400,000

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Grants under Outstanding Stock Award Plans (Detail)	12 Months Ended
	Dec. 31, 2020shares
Employees [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Awards granted, Number of Shares	8,034,890
Employees [Member] \| 2019 CEO Special Bonus [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Awards granted, Number of Shares	34,960
Employees [Member] \| Employee Plan 2020 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Awards granted, Number of Shares	7,999,930
2010 [Member] \| Supervisory Board [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Year of grant	2010
Options granted and vested	172,500
Options waived at grant	(7,500)
2011 [Member] \| Supervisory Board [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Year of grant	2011
Options granted and vested	172,500
Options waived at grant	(30,000)
2012 [Member] \| Supervisory Board [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Year of grant	2012
Options granted and vested	180,000
Options waived at grant	(22,500)
No Options Granted [Member] \| Supervisory Board [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Year of grant	2013 to 2020
July 25, 2017 [Member] \| Employees [Member] \| Employee Plan 2017 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Jul. 25, 2017
Awards granted, Number of Shares	7,634,475
December 22, 2017 [Member] \| Employees [Member] \| Employee Plan 2017 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Dec. 22, 2017
Awards granted, Number of Shares	347,160
July 24, 2018 [Member] \| Employees [Member] \| Employee Plan 2018 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Jul. 24, 2018
Awards granted, Number of Shares	7,552,410
December 20, 2018 [Member] \| Employees [Member] \| Employee Plan 2018 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Dec. 20, 2018
Awards granted, Number of Shares	443,200
May 23, 2019 [Member] \| Employees [Member] \| 2019 CEO Special Bonus [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	May 23, 2019
Awards granted, Number of Shares	34,960
July 24, 2019 [Member] \| Employees [Member] \| Employee Plan 2019 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Jul. 24, 2019
Awards granted, Number of Shares	7,752,940
Share based compensation arrangement by share based payment award, Number of shares lost on performance	(1,161,966)
December 26, 2019 [Member] \| Employees [Member] \| Employee Plan 2019 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Dec. 26, 2019
Awards granted, Number of Shares	246,750
Share based compensation arrangement by share based payment award, Number of shares lost on performance	(17,013)
July 23, 2020 [Member] \| Employees [Member] \| Employee Plan 2020 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Jul. 23, 2020
Awards granted, Number of Shares	7,437,580
December 24, 2020 [Member] \| Employees [Member] \| Employee Plan 2020 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Grant date of Nonvested share	Dec. 24, 2020
Awards granted, Number of Shares	562,350

Shareholders' Equity - Summar_2

Shareholders' Equity - Summary of Nonvested Share Activity (Detail) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested, Number of Shares		(7,260,486)
Supervisory Board [Member] \| 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares		22,500
Year of grant	2010
Exercised		(22,500)
Supervisory Board [Member] \| 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	45,000	52,500
Year of grant	2011
Exercised	(37,500)	(7,500)
Ending Balance, Number of Shares	7,500	45,000
Supervisory Board [Member] \| 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	65,000	65,000
Year of grant	2012
Exercised	(15,000)
Ending Balance, Number of Shares	50,000	65,000
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	15,823,673
Awards granted, Number of Shares	8,034,890
Awards forfeited/waived, Number of Shares	(131,042)
Awards cancelled on failed vesting conditions, Number of Shares	(1,178,979)
Awards vested, Number of Shares	(7,260,486)
Ending Balance, Number of Shares	15,288,056	15,823,673
Employees [Member] \| Employee Plan 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	2,648,379
Awards forfeited/waived, Number of Shares	(14,634)
Awards cancelled on failed vesting conditions, Number of Shares	0
Awards vested, Number of Shares	(2,633,745)
Ending Balance, Number of Shares		2,648,379
Employees [Member] \| Employee Plan 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	5,197,924
Awards forfeited/waived, Number of Shares	(36,912)
Awards cancelled on failed vesting conditions, Number of Shares	0
Awards vested, Number of Shares	(2,442,327)
Ending Balance, Number of Shares	2,718,685	5,197,924
Employees [Member] \| 2019 CEO Special Bonus [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted, Number of Shares	34,960
Awards vested, Number of Shares	(11,654)
Ending Balance, Number of Shares	23,306
Employees [Member] \| Employee Plan 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning Balance, Number of Shares	7,977,370
Awards forfeited/waived, Number of Shares	(51,111)
Awards cancelled on failed vesting conditions, Number of Shares	(1,178,979)
Awards vested, Number of Shares	(2,172,160)
Ending Balance, Number of Shares	4,575,120	7,977,370
Employees [Member] \| Employee Plan 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted, Number of Shares	7,999,930
Awards forfeited/waived, Number of Shares	(28,385)
Awards vested, Number of Shares	(600)
Ending Balance, Number of Shares	7,970,945

Shareholders' Equity - Classifi

Shareholders' Equity - Classification of Pre-Payroll Tax and Social Contribution Stock-Based Compensation Expense Included in Consolidated Statements of Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-payroll tax and social contribution compensation	$ 155	$ 145	$ 125
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-payroll tax and social contribution compensation	25	22	23
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-payroll tax and social contribution compensation	51	46	67
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total pre-payroll tax and social contribution compensation	$ 79	$ 77	$ 35

Shareholders' Equity - Changes

Shareholders' Equity - Changes in AOCI Attributable to Stockholders (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OCI before reclassifications	$ 245	$ (133)	$ (196)
Amounts reclassified from AOCI	14	93	10
OCI Balance	259	(40)	(186)
Cumulative tax impact	(11)	6	7
OCI Balance, net of tax	248	(34)	(179)
Balance	680	421	461	$ 647
Cumulative tax impact	43	54	48	41
Balance, net of tax	723	475	509	688
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
OCI before reclassifications	64	(43)	(83)
Amounts reclassified from AOCI		79	(1)
OCI Balance	64	36	(84)
Cumulative tax impact	(8)	(4)	4
OCI Balance, net of tax	56	32	(80)
Balance	61	(3)	(39)	45
Cumulative tax impact	(8)		4
Balance, net of tax	53	(3)	(35)	45
Accumulated Net Gains (Losses) on Available-for-Sale Securities [Member]
OCI before reclassifications		3	(2)
OCI Balance		3	(2)
OCI Balance, net of tax		3	(2)
Balance	1	1	(2)
Balance, net of tax	1	1	(2)
Accumulated Defined Benefit Plan Items [Member]
OCI before reclassifications	(22)	(58)	(24)
Amounts reclassified from AOCI	14	14	11
OCI Balance	(8)	(44)	(13)
Cumulative tax impact	(3)	10	3
OCI Balance, net of tax	(11)	(34)	(10)
Balance	(231)	(223)	(179)	(166)
Cumulative tax impact	51	54	44	41
Balance, net of tax	(180)	(169)	(135)	(125)
Foreign Currency Translation Adjustments ("CTA") [Member]
OCI before reclassifications	203	(35)	(87)
OCI Balance	203	(35)	(87)
OCI Balance, net of tax	203	(35)	(87)
Balance	849	646	681	768
Balance, net of tax	$ 849	$ 646	$ 681	$ 768

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Items Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	$ 6,430	$ 5,860	$ 5,803
Selling, general and administrative	(1,109)	(1,093)	(1,095)
Other components of pension benefit costs	(1,548)	(1,498)	(1,398)
Other components of pension benefit costs	(12)	(16)	(11)
Income tax benefit (expense)	(159)	(156)	(96)
Net income	1,108	1,033	1,293
Attributable to noncontrolling interest	(2)	(1)	(6)
Attributable to the parent company stockholders	1,106	1,032	1,287
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(11)	(80)	(8)
Attributable to noncontrolling interest	0	0	0
Attributable to the parent company stockholders	(11)	(80)	(8)
Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)		10
Net income		(69)	1
Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Foreign Exchange Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(3)	(51)	4
Selling, general and administrative	1	(6)	(1)
Other components of pension benefit costs	2	(22)	(2)
Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Amortization of Actuarial Gains (Losses) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of pension benefit costs	(13)	(13)	(10)
Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Amortization of Prior Service Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other components of pension benefit costs	(1)	(1)	(1)
Income tax benefit (expense)	3	3	2
Net income	$ (11)	$ (11)	$ (9)

Revenues - Additional Informati

Revenues - Additional Information (Detail1)	Dec. 31, 2020
Maximum [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations term	1 year

Revenues - Additional Informa_2

Revenues - Additional Information (Detail)	12 Months Ended
Revenues - Additional Information (Detail)	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue recognition and disaggregation payment terms description	The payment terms typically range between 30 and 90 days.
Minimum [Member]
Disaggregation of Revenue [Line Items]
Revenue recognition and disaggregation payment terms	30 days
Maximum [Member]
Disaggregation of Revenue [Line Items]
Revenue recognition and disaggregation payment terms	90 days

Revenues - Summary of Consolida

Revenues - Summary of Consolidated Net Revenues Disaggregated by Product Group, Geographical Region of Shipment and Nature (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 10,219	$ 9,556	$ 9,664
Sales Channel, Directly to Consumer [Member]
Disaggregation of Revenue [Line Items]
Total revenues	7,411	6,720	6,325
Sales Channel, Through Intermediary [Member]
Disaggregation of Revenue [Line Items]
Total revenues	2,808	2,836	3,339
Net Sales [Member]
Disaggregation of Revenue [Line Items]
Total revenues	10,049	9,381	9,461
Service [Member]
Disaggregation of Revenue [Line Items]
Total revenues	132	148	151
Other Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	38	27	52
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,966	2,265	2,478
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues	1,165	1,351	1,264
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues	$ 7,088	$ 5,940	$ 5,922

Segment Information - Net Reven

Segment Information - Net Revenues by Product Segment and by Product Line (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 10,219	$ 9,556	$ 9,664
Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	10,206	9,543	9,650
Automotive and Discrete Group (ADG) [Member] \| Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,284	3,606	3,556
Analog, MEMS & Sensors Group (AMS) [Member] \| Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,892	3,299	3,154
Microcontrollers and Digital ICs Group (MDG) [Member] \| Product Segments [Member]
Segment Reporting Information [Line Items]
Net revenues	3,030	2,638	2,940
Others [Member]
Segment Reporting Information [Line Items]
Net revenues	$ 13	$ 13	$ 14

Segment Information - Operating

Segment Information - Operating Income by Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ 1,323	$ 1,203	$ 1,400
Product Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	1,496	1,307	1,466
Analog, MEMS & Sensors Group (AMS) [Member] \| Product Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	810	596	488
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	1,496	1,307	1,466
Operating Segments [Member] \| Automotive and Discrete Group (ADG) [Member] \| Product Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	182	357	431
Operating Segments [Member] \| Microcontrollers and Digital ICs Group (MDG) [Member] \| Product Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	504	354	547
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	(173)	(104)	(66)
Segment Reconciling Items [Member] \| Others [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)	$ (173)	$ (104)	$ (66)

Segment Information - Reconcili

Segment Information - Reconciliation of Operating Income of Segments to Total Operating Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	$ 1,323	$ 1,203	$ 1,400
Impairment, restructuring charges and other related closure costs	(11)	(5)	(21)
Gain on sale of non-current assets	14	7	8
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	1,496	1,307	1,466
Segment Reconciling Items [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income	(173)	(104)	(66)
Impairment, restructuring charges and other related closure costs	(11)	(5)	(21)
Unused capacity charges	(153)	(65)	(1)
Other unallocated manufacturing results	(8)	(25)	2
Gain on sale of non-current assets	11	6	1
Strategic and other research and development programs and other non-allocated provisions	$ (12)	$ (15)	$ (47)

Segment Information - Net Rev_2

Segment Information - Net Revenues (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 10,219	$ 9,556	$ 9,664
Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	2,795	2,842	2,917
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	89	108	127
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	52	59	64
USA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	976	1,157	1,132
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	5,817	4,857	4,873
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	479	520	534
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 11	$ 13	$ 17

Segment Information - Property,

Segment Information - Property, Plant & Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 4,596	$ 4,007
Netherlands [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1,046	897
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	905	726
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	1,213	900
Other European Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	118	117
USA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	24	25
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	604	670
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	186	218
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 500	$ 454

Other Income and Expenses Net -

Other Income and Expenses Net - Other Income and Expenses Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income And Expenses [Abstract]
Research and development funding	$ 231	$ 132	$ 52
Phase-out and start-up costs	(8)	(38)	(1)
Exchange gains and losses, net	8		4
Patent costs	(11)	(1)	(8)
Gain on sale of non-current assets	14	7	8
COVID-19 incremental costs	(32)	0	0
Other, net		3	(2)
Total	$ 202	$ 103	$ 53

Other Income and Expenses Net_2

Other Income and Expenses Net - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Income And Expenses [Line Items]
Long-term liability related to public funding	$ 42	$ 47
Grant receivables (current and non-current)	206
Other Current Assets [Member]
Other Income And Expenses [Line Items]
Grant receivables, current	$ 105

Impairment, Restructuring Cha_3

Impairment, Restructuring Charges and Other Related Closure Costs - Summary of Impairment, Restructuring Charges and Other Related Closure Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Impairment	$ (4)	$ (7)	$ (2)
Restructuring charges	(7)	2	(19)
Total impairment, restructuring charges and other related closure costs	(11)	(5)	(21)
Set-top Box Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1	2	(19)
Total impairment, restructuring charges and other related closure costs	1	2	(19)
Long-lived Asset Impairment Charge [Member]
Restructuring Cost And Reserve [Line Items]
Impairment	(4)	(7)	(2)
Total impairment, restructuring charges and other related closure costs	(4)	$ (7)	$ (2)
Bouskoura Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(8)
Total impairment, restructuring charges and other related closure costs	$ (8)

Impairment, Restructuring Cha_4

Impairment, Restructuring Charges and Other Related Closure Costs - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)Employee	Dec. 31, 2020USD ($)Employee	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2016Employee
Restructuring Cost And Reserve [Line Items]
Impairment charges		$ 4	$ 7	$ 2
Reversal for unused provisions		1	2
Provision for restructuring	$ 10	4	10
Restructuring charges and other related closure costs		14
Set-top Box Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Number of employees affected \| Employee					1,400
Reversal for unused provisions		1	2
Restructuring expected cost		170
Restructuring Charges incurred		$ 132
Set-top Box Restructuring Plan [Member] \| France [Member]
Restructuring Cost And Reserve [Line Items]
Number of employees affected \| Employee					430
Set-top Box Restructuring Plan [Member] \| Asia [Member]
Restructuring Cost And Reserve [Line Items]
Number of employees affected \| Employee					670
Set-top Box Restructuring Plan [Member] \| USA [Member]
Restructuring Cost And Reserve [Line Items]
Number of employees affected \| Employee					120
Set-top Box Restructuring Plan [Member] \| Employee Termination Benefits [Member] \| France [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges and other related closure costs				19
Bouskoura Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Number of employees affected \| Employee		179
Restructuring expected cost	$ 7		7
Bouskoura Restructuring Plan [Member] \| MOROCCO
Restructuring Cost And Reserve [Line Items]
Expected number of employees affected due to restructuring plan \| Employee	150
Bouskoura Restructuring Plan [Member] \| Employee Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges and other related closure costs		$ 8
Licenses
Restructuring Cost And Reserve [Line Items]
Impairment charges		$ 4
Equipment or Licenses [Member]
Restructuring Cost And Reserve [Line Items]
Impairment charges			$ 7
Acquired Technologies [Member]
Restructuring Cost And Reserve [Line Items]
Impairment charges				$ 2

Impairment, Restructuring Cha_5

Impairment, Restructuring Charges and Other Related Closure Costs - Changes to Restructuring Provisions Recorded on Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Provision, beginning balance	$ 11	$ 35
Charges incurred	8
Adjustment for unused provisions	(1)	(2)
Amounts paid	(14)	(21)
Currency translation effect		(1)
Provision, ending balance	4	11
Set-top Box Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Provision, beginning balance	11	34
Adjustment for unused provisions	(1)	(2)
Amounts paid	(6)	(20)
Currency translation effect		(1)
Provision, ending balance	4	11
Bouskoura Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Charges incurred	8
Amounts paid	$ (8)
Other Restructuring Initiatives
Restructuring Cost And Reserve [Line Items]
Provision, beginning balance		1
Amounts paid		$ (1)

Interest Income (Expense), Ne_2

Interest Income (Expense), Net - Summary of Interest Income (Expense), Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Income	$ 34	$ 55	$ 47
Expense	(54)	(54)	(54)
Total	$ (20)	$ 1	$ (7)

Interest Income (Expense), Ne_3

Interest Income (Expense), Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Investment Income [Line Items]
Capitalized borrowing cost	$ 0	$ 0	$ 0
U.S. Treasury Bonds [Member]
Net Investment Income [Line Items]
Interest income (expense), net	3,000,000	6,000,000	6,000,000
Senior Unsecured Convertible Debt Issued on July 3, 2017 [Member]
Net Investment Income [Line Items]
Interest expense	$ 36,000,000	39,000,000	38,000,000
Issued date of senior unsecured convertible bonds	Jul. 3, 2017
Senior Unsecured Convertible Debt Issued on August 4, 2020 [Member]
Net Investment Income [Line Items]
Interest expense	$ 9,000,000
Issued date of senior unsecured convertible bonds	Aug. 4, 2020
Senior Unsecured Convertible Debt [Member]
Net Investment Income [Line Items]
Non-cash interest expense accretion of discount on liability component	$ 42,000,000	$ 37,000,000	$ 36,000,000

Income Tax - Income (Loss) befo

Income Tax - Income (Loss) before Income Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) recorded in the Netherlands	$ (19)	$ (9)	$ (13)
Income (loss) from foreign operations	1,286	1,198	1,402
Income before income taxes and noncontrolling interest	$ 1,267	$ 1,189	$ 1,389

Income Tax - Income Tax Benefit

Income Tax - Income Tax Benefit (Expense) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Foreign taxes - current	$ (171)	$ (131)	$ (114)
Total current taxes	(171)	(131)	(114)
Foreign taxes - deferred	12	(25)	18
Total deferred taxes	12	(25)	18
Income tax expense	$ (159)	$ (156)	$ (96)
Effective tax rate	13.00%	13.00%	7.00%

Income Tax - Additional Informa

Income Tax - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 20, 2019
Operating Loss Carryforwards [Line Items]
Netherlands statutory income taxes rate	25.00%	25.00%	25.00%
Effect of the tax benefits on basic earnings per share	$ 0.04	$ 0.14	$ 0.15
Maximum percentage of tax reduction from tax holidays	100.00%	100.00%	100.00%
Income tax holiday expiration date	Dec. 31, 2029
Legal inflationary index	(0.15%)
Deferred tax (expense) gain recorded as component of other comprehensive income (loss)	$ (11)	$ 6
Cumulative amount of distributable earnings	3,783			$ 3,628
Unrecognized tax benefits	19	21
Accrued interest and penalties related to uncertain tax positions			$ 1
Interest and penalties of unrecognized tax benefits	$ 7	6
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	1997
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Open tax year	2020
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Accrued interest and penalties related to uncertain tax positions	$ 1	$ 1

Income Tax - Differences in Inc

Income Tax - Differences in Income Taxes Computed at Netherlands Statutory Rate and Effective Income Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax benefit (expense) computed at statutory rate	$ (316)	$ (297)	$ (353)
Non-deductible and non-taxable permanent differences, net	(1)	4	45
Valuation allowance adjustments	11	2	141
Effect on deferred taxes of changes in enacted tax rates	(5)	14	(62)
Current year credits	40	50	43
Other tax and credits	(40)	(51)	(20)
Benefits from tax holidays	37	129	135
Net impact of changes to uncertain tax positions	(1)	(5)	(16)
Earnings of subsidiaries taxed at different rates	116	(2)	(9)
Income tax expense	$ (159)	$ (156)	$ (96)

Income Tax - Deferred Tax Asset

Income Tax - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Tax loss carryforwards and investment credits	$ 702	$ 612
Less unrecognized tax benefit	(19)	(21)
Tax loss carryforwards net of unrecognized tax benefit	683	591
Inventory valuation	34	28
Impairment and restructuring charges	3	6
Fixed asset depreciation in arrears	82	39
Increased depreciation incentives	182	213
Capitalized development costs	107	118
Receivables for government funding	40	14
Tax credits granted on past capital investments	215	1,151
Pension service costs	104	81
Stock awards	11	6
Operating lease liabilities	36	40
Commercial accruals	13	15
Other temporary differences	26	22
Total deferred tax assets	1,536	2,324
Valuation allowances	(638)	(1,534)
Deferred tax assets, net	898	790
Accelerated fixed asset depreciation	(21)	(20)
Acquired intangible assets	(40)	(16)
Advances of government funding	(94)	(31)
Operating lease right-of-use assets	(36)	(40)
Other temporary differences	(43)	(7)
Deferred tax liabilities	(234)	(114)
Net deferred income tax asset	$ 664	$ 676

Income Tax - Gross Deferred Tax

Income Tax - Gross Deferred Tax Assets on Tax Loss Carryforwards and Investment Credits Expiration (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
2021	$ 4
2022	7
2023	5
2024	4
2025	13
Thereafter	669
Total	$ 702	$ 612

Income Tax - Reconciliation of

Income Tax - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 48	$ 38	$ 333
Additions based on tax positions related to the current year	1	7	43
Additions based on acquisitions related to the current year		5
Additions for tax positions of prior years	1	1	8
Reduction for tax positions of prior years	(2)	(1)	(310)
Settlements	(1)	(2)	(18)
Foreign currency translation	1		(18)
Balance at end of year	$ 48	$ 48	$ 38

Earnings per Share - Summary of

Earnings per Share - Summary of Earnings per Share ("EPS") (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic EPS
Net income attributable to parent company	$ 1,106	$ 1,032	$ 1,287
Weighted average shares outstanding	894,578,477	894,297,697	899,363,170
Basic EPS	$ 1.24	$ 1.15	$ 1.43
Diluted EPS
Net income attributable to parent company	$ 1,106	$ 1,032	$ 1,287
Weighted average shares outstanding	894,578,477	894,297,697	899,363,170
Dilutive effect of stock awards	8,860,216	7,014,595	7,251,641
Dilutive effect of convertible debt	16,291,279	2,333,493	4,341,334
Number of shares used in calculating diluted EPS	919,729,972	903,645,785	910,956,145
Diluted EPS	$ 1.20	$ 1.14	$ 1.41

Earnings per Share - Additional

Earnings per Share - Additional Information (Detail) $ / shares in Units, $ in Millions	Dec. 31, 2020USD ($)$ / shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Stock price \| $ / shares	$ 37.12
Senior Unsecured Convertible Bonds [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Debt instrument principal amount	$ 750
Expected excess amount over principal upon conversion	$ 605

Commitments - Company's Commitm

Commitments - Company's Commitments (Detail) $ in Millions	Dec. 31, 2020USD ($)
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, Total	$ 1,978
Purchase obligations, 2021	1,488
Purchase obligations, 2022	237
Purchase obligations, 2023	124
Purchase obligations, 2024	68
Purchase obligations, 2025	61
Other obligations, Total	869
Other obligations, 2021	452
Other obligations, 2022	120
Other obligations, 2023	62
Other obligations, 2024	83
Other obligations, 2025	62
Other obligations, Thereafter	90
Company's commitments, Total	2,847
Company's commitments, 2021	1,940
Company's commitments, 2022	357
Company's commitments, 2023	186
Company's commitments, 2024	151
Company's commitments, 2025	123
Company's commitments, Thereafter	90
Equipment Purchase [Member]
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, Total	916
Purchase obligations, 2021	916
Foundry Purchase [Member]
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, Total	935
Purchase obligations, 2021	475
Purchase obligations, 2022	216
Purchase obligations, 2023	119
Purchase obligations, 2024	64
Purchase obligations, 2025	61
Software, Design, Technologies and Licenses [Member]
Recorded Unconditional Purchase Obligation [Line Items]
Purchase obligations, Total	127
Purchase obligations, 2021	97
Purchase obligations, 2022	21
Purchase obligations, 2023	5
Purchase obligations, 2024	$ 4

Financial Instruments and Ris_3

Financial Instruments and Risk Management - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)Customer	Dec. 31, 2019USD ($)Customer	Dec. 31, 2018USD ($)	Aug. 04, 2020USD ($)	Jul. 03, 2017USD ($)
Derivative [Line Items]
Maximum percentage for Research and Development and Corporate costs of the total forecasted transactions	80.00%
Maximum percentage for manufacturing costs of forecasted transactions	70.00%
Maximum percentage for designated hedged item of forecasted transactions	100.00%
Hedge exposure to the variability of cash flows for forecasted transactions	24 months
Deferred gains on derivative instrument, net of tax	$ 61,000,000
Period of Accumulated other comprehensive income (loss)	12 months
Fair value of assets	$ 65,000,000	$ 8,000,000
Fair value of liabilities	$ 2,000,000	$ 7,000,000
Maximum outstanding amount per instrument with each Bank , as percentage of total	20.00%
Number of customer represented more than 10% of trade accounts receivable \| Customer	0	0
Business combination, identifiable assets acquired corresponded to technologies	$ 118,000,000
Impairment charge on investments	1,000,000	$ 0	$ 0
Fair value measurement with unobservable inputs reconciliation recurring basis asset liability value	0
Fair value measurement with unobservable inputs reconciliation non-recurring basis asset liability value	0
Unrealized loss position	0	0
Fair Value, Inputs, Level 3 [Member]
Derivative [Line Items]
Fair value of liability component				$ 1,362,000,000	$ 1,266,000,000
Senior Unsecured Convertible Bonds [Member]
Derivative [Line Items]
Senior unsecured convertible bonds				1,500,000,000
Senior Unsecured Convertible Bonds [Member] \| Debt Instrument Tranche A Due 2025 [Member]
Derivative [Line Items]
Senior unsecured convertible bonds				750,000,000
Senior Unsecured Convertible Bonds [Member] \| Debt Instrument Tranche B Due 2027 [Member]
Derivative [Line Items]
Senior unsecured convertible bonds				$ 750,000,000
Senior Unsecured Convertible Bonds [Member] \| Zero-coupon, due 2022 (Tranche A) [Member]
Derivative [Line Items]
Senior unsecured convertible bonds		700,000,000
Senior Unsecured Convertible Bonds [Member] \| 0.25% due 2024 (Tranche B) [Member]
Derivative [Line Items]
Senior unsecured convertible bonds	$ 674,000,000	654,000,000
Measurement Input, Discount Rate [Member]
Derivative [Line Items]
Fair value of intangible assets, discount rate	0.09
Measurement Input, Discount Rate [Member] \| Zero-coupon, due 2022 (Tranche A) [Member]
Derivative [Line Items]
Debt discount rate				0.0130
Measurement Input, Discount Rate [Member] \| 0.25% due 2024 (Tranche B) [Member]
Derivative [Line Items]
Debt discount rate				0.0185
Measurement Input, Discount Rate [Member] \| Senior Unsecured Convertible Bonds [Member]
Derivative [Line Items]
Debt instrument, measurement input	0.8
Foreign Exchange Contract [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Cost of Sales [Member]
Derivative [Line Items]
Realized gain (loss) on reduction in operating expenses	$ 3,000,000	51,000,000	4,000,000
Foreign Exchange Contract [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Reclassification Out of Accumulated Other Comprehensive Income [Member] \| Operating Expense [Member]
Derivative [Line Items]
Realized gain (loss) on reduction in operating expenses	(3,000,000)	$ 28,000,000	3,000,000
Currency Collars [Member] \| Option One [Member]
Derivative [Line Items]
Fair value of net assets (liabilities)	15,000,000
Fair value of assets	16,000,000
Fair value of liabilities	1,000,000
Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Fair value of assets	50,000,000
Fair value of liabilities	$ 2,000,000
Minimum [Member]
Derivative [Line Items]
Major customer percentage of trade accounts receivable	10.00%	10.00%
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of Derivative Instruments	$ 897,000,000	$ 575,000,000	376,000,000
Foreign currency forward contracts maturity term	42 days
Fair value of assets	$ 10,000,000	3,000,000
Fair value of liabilities	$ 2,000,000	1,000,000
Not Designated as Hedging Instrument [Member] \| Minimum [Member]
Derivative [Line Items]
Foreign currency forward contracts remaining terms	4 days
Not Designated as Hedging Instrument [Member] \| Maximum [Member]
Derivative [Line Items]
Foreign currency forward contracts remaining terms	181 days
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount of Derivative Instruments	$ 1,502,000,000	1,328,000,000	$ 1,597,000,000
Foreign currency forward contracts maturity term	118 days
Fair value of assets	$ 55,000,000	5,000,000
Fair value of liabilities		$ 6,000,000
Designated as Hedging Instrument [Member] \| Minimum [Member]
Derivative [Line Items]
Foreign currency forward contracts remaining terms	6 days
Designated as Hedging Instrument [Member] \| Maximum [Member]
Derivative [Line Items]
Foreign currency forward contracts remaining terms	11 months

Financial Instruments and Ris_4

Financial Instruments and Risk Management - Notional Amounts of Outstanding Derivative Instruments (Detail) - Dec. 31, 2020 - Designated as Hedging Instrument [Member]	EUR (€)	SGD ($)
Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Notional amount of Derivative Instruments	€ 215,000,000
Notional amount of Derivative Instruments	341,000,000	$ 157,000,000
Currency Collars [Member]
Derivative [Line Items]
Notional amount of Derivative Instruments	237,000,000
Notional amount of Derivative Instruments	€ 334,000,000

Financial Instruments and Ris_5

Financial Instruments and Risk Management - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 65	$ 8
Total Liability Derivatives	(2)	(7)
Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	50
Total Liability Derivatives	(2)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	55	5
Total Liability Derivatives		(6)
Designated as Hedging Instrument [Member] \| Foreign Exchange Forward Contracts [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	40	4
Designated as Hedging Instrument [Member] \| Foreign Exchange Forward Contracts [Member] \| Other Payables and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives		(4)
Designated as Hedging Instrument [Member] \| Currency Collars [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	15	1
Designated as Hedging Instrument [Member] \| Currency Collars [Member] \| Other Payables and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives		(2)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	10	3
Total Liability Derivatives	(2)	(1)
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward Contracts [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	10	3
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Forward Contracts [Member] \| Other Payables and Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$ (2)	$ (1)

Financial Instruments and Ris_6

Financial Instruments and Risk Management - Effect on Consolidated Statements of Income of Derivative Instruments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	$ 61	$ (3)
Gain (loss) reclassified from OCI into earnings		(79)
Foreign Exchange Forward Contracts [Member] \| Cost of Sales [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	29	(1)
Gain (loss) reclassified from OCI into earnings	(2)	(36)
Foreign Exchange Forward Contracts [Member] \| Selling, General and Administrative [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	3
Gain (loss) reclassified from OCI into earnings	1	(4)
Foreign Exchange Forward Contracts [Member] \| Research and Development [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	11	(1)
Gain (loss) reclassified from OCI into earnings	2	(15)
Currency Collars [Member] \| Cost of Sales [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	11	(1)
Gain (loss) reclassified from OCI into earnings	(1)	(15)
Currency Collars [Member] \| Selling, General and Administrative [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	1
Gain (loss) reclassified from OCI into earnings		(2)
Currency Collars [Member] \| Research and Development [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) deferred in OCI on derivative	$ 6
Gain (loss) reclassified from OCI into earnings		$ (7)

Financial Instruments and Ris_7

Financial Instruments and Risk Management - Effect on Consolidated Statements of Income of Derivative Instruments Not Designated as Hedge (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange forward contracts	$ (13)	$ 1
Foreign Exchange Forward Contracts [Member] \| Other Income and Expenses, Net [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange forward contracts	$ (13)	$ 1

Financial Instruments and Ris_8

Financial Instruments and Risk Management - Schedule of Financial Assets (Liabilities) Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 25	$ 23
Derivative instruments	65	8
Derivative instruments	(2)	(7)
Contingent consideration on business acquisitions	(123)
Total	679	161
Fair Value Through Earnings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	25	23
U.S. Treasury Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	133	133
Short-Term Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	581	4
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	739	160
Fair Value, Inputs, Level 1 [Member] \| Fair Value Through Earnings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	25	23
Fair Value, Inputs, Level 1 [Member] \| U.S. Treasury Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	133	133
Fair Value, Inputs, Level 1 [Member] \| Short-Term Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	581	4
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	63	1
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration on business acquisitions	(123)
Total	(123)
Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	55	5
Derivative instruments		(6)
Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	55	5
Derivative instruments		(6)
Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	55	5
Derivative instruments		(6)
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	10	3
Derivative instruments	(2)	(1)
Not Designated as Hedging Instrument [Member] \| Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	10	3
Derivative instruments	(2)	(1)
Not Designated as Hedging Instrument [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instruments	10	3
Derivative instruments	$ (2)	$ (1)

Financial Instruments and Ris_9

Financial Instruments and Risk Management - Schedule of Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value, Inputs, Level 3 [Member] $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration on business combinations	$ 117
Changes in fair value measurement	1
Currency translation adjustment	5
December 31, 2020	123
Amount of total losses for the period included in earnings attributable to liabilities still held at the reporting date	$ 1

Financial Instruments and Ri_10

Financial Instruments and Risk Management - Fair Value Information on Other Financial Assets and Liabilities Recorded at Amortized Cost (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 3,006	$ 2,597
Short-term, deposits	581	4
Estimate Fair Value [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche A [Member]
Long-term debt
Senior unsecured convertible bonds		1,030
Estimate Fair Value [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,637	1,691
Short-term, deposits	581	4
Estimate Fair Value [Member] \| Fair Value, Inputs, Level 1 [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche B [Member]
Long-term debt
Senior unsecured convertible bonds	1,359	1,073
Estimate Fair Value [Member] \| Fair Value, Inputs, Level 1 [Member] \| Senior Unsecured Convertible Bonds Issued on August 4, 2020 [Member]
Long-term debt
Senior unsecured convertible bonds	1,835	0
Estimate Fair Value [Member] \| Fair Value, Inputs, Level 2 [Member]
Long-term debt
Bank loans (including current portion)	583	718
Estimate Fair Value [Member] \| Fair Value, Inputs, Level 3 [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche A [Member]
Long-term debt
Senior unsecured convertible bonds		1,030
Carrying Amount [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2,637	1,691
Short-term, deposits	581	4
Carrying Amount [Member] \| Fair Value, Inputs, Level 1 [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche B [Member]
Long-term debt
Senior unsecured convertible bonds	674	654
Carrying Amount [Member] \| Fair Value, Inputs, Level 1 [Member] \| Senior Unsecured Convertible Bonds Issued on August 4, 2020 [Member]
Long-term debt
Senior unsecured convertible bonds	1,364	0
Carrying Amount [Member] \| Fair Value, Inputs, Level 2 [Member]
Long-term debt
Bank loans (including current portion)	$ 583	718
Carrying Amount [Member] \| Fair Value, Inputs, Level 3 [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche A [Member]
Long-term debt
Senior unsecured convertible bonds		$ 700

Financial Instruments and Ri_11

Financial Instruments and Risk Management - Fair Value Information on Other Financial Assets and Liabilities Recorded at Amortized Cost (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Conversion features of the instruments value	$ 215
Estimate Fair Value [Member] \| Senior Unsecured Convertible Bonds Issued on July 3, 2017 Tranche A [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured convertible bonds		$ 1,030

Financial Instruments and Ri_12

Financial Instruments and Risk Management - Schedule of Methodologies Used to Estimate Fair Value (Detail)	12 Months Ended
	Dec. 31, 2020
Debt Securities Classified as Available for Sale [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	Quoted market prices for identical instruments
Foreign Exchange Forward Contracts Currency Options and Collars [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	Quoted market prices for similar instruments
Equity Securities Measured at Fair Value Through Earnings [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	Quoted market prices for identical instruments
Equity Securities Carried at Cost as a Measurement Alternative [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	Valuation of the underlying investments on a new round of third-party financing or upon liquidation
Long-term Debt and Current Portion of Long Term Debt [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	Future cash flows on a borrowing-by-borrowing basis and discounting these future cash flows using the Company's incremental borrowing rates for similar types of borrowing arrangements
Cash and Cash Equivalents Accounts Receivable Short-term Borrowings and Accounts Payable [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Methodology used to estimate fair value	The carrying amounts reflected in the consolidated financial statements are considered as reasonable estimates of fair value due to the relatively short period of time between the origination of the instruments and their expected realization.

Related Party Transactions - Tr

Related Party Transactions - Transactions with Significant Shareholders, their Affiliates and Other Related Parties (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions [Abstract]
Sales & other services	$ 5	$ 2
Other purchases	21	$ 18	$ 15
Accounts receivable	$ 1		2
Accounts payable			$ 52

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ST Foundation [Member]
Related Party Transaction [Line Items]
Contributed cash amounts to ST Foundation	$ 0.5	$ 0.4	$ 0.5

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Trade Receivables [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 16	$ 15	$ 15
Additions/ (Deductions)		1
Balance at end of period	16	16	15
Valuation Allowance of Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,534	1,548	1,502
Translation adjustment	28	(4)	(16)
Charged to costs and expenses	(11)		143
Additions/ (Deductions)	(913)	(10)	(81)
Balance at end of period	$ 638	$ 1,534	$ 1,548