KBR (KBR) 10-Q23 Oct 242024 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 27, 2024	Oct. 16, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 27, 2024
Document Transition Report	false
Entity File Number	001-33146
Entity Registrant Name	KBR, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-4536774
Entity Address, Address Line One	601 Jefferson Street, Suite 3400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	753-2000
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	KBR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		133,242,000
Amendment Flag	false
Entity Central Index Key	0001357615
Current Fiscal Year End Date	--01-03
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Income Statement [Abstract]
Revenues	$ 1,947	$ 1,770	$ 5,620	$ 5,226
Cost of revenues	(1,656)	(1,526)	(4,810)	(4,486)
Gross profit	291	244	810	740
Equity in earnings of unconsolidated affiliates	27	32	97	78
Selling, general and administrative expenses	(140)	(127)	(390)	(370)
Legal settlement of legacy matter	0	0	0	(144)
Other	(5)	(2)	3	(3)
Operating income	173	147	520	301
Interest expense	(37)	(30)	(100)	(85)
Charges associated with Convertible Notes	0	(114)	0	(428)
Other non-operating income (expense)	(2)	2	(10)	(1)
Income (loss) before income taxes	134	5	410	(213)
Provision for income taxes	(32)	(23)	(107)	(69)
Net income (loss)	102	(18)	303	(282)
Less: Net income attributable to noncontrolling interests	2	3	4	4
Net income (loss) attributable to KBR	$ 100	$ (21)	$ 299	$ (286)
Net income (loss) attributable to KBR per share
Basic (in usd per share)	$ 0.75	$ (0.16)	$ 2.22	$ (2.10)
Diluted (in usd per share)	$ 0.75	$ (0.16)	$ 2.22	$ (2.10)
Basic weighted average common shares outstanding (in shares)	133	135	134	136
Diluted weighted average common shares outstanding (in shares)	133	135	134	136
Cash dividends declared per share (in usd per share)	$ 0.150	$ 0.135	$ 0.450	$ 0.405

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 102	$ (18)	$ 303	$ (282)
Other comprehensive income (loss):
Foreign currency translation adjustments	47	(34)	39	5
Pension and post-retirement benefits	2	3	5	1
Changes in fair value of derivatives	(27)	5	(16)	18
Other comprehensive income (loss)	22	(26)	28	24
Income tax (expense) benefit:
Pension and post-retirement benefits	(1)	(3)	(1)	0
Changes in fair value of derivatives	5	(2)	3	(3)
Income tax (expense) benefit	4	(5)	2	(3)
Other comprehensive income (loss), net of tax	26	(31)	30	21
Comprehensive income (loss)	128	(49)	333	(261)
Less: Comprehensive income attributable to noncontrolling interests	2	3	4	4
Comprehensive income (loss) attributable to KBR	$ 126	$ (52)	$ 329	$ (265)

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Current assets:
Cash and cash equivalents	$ 462	$ 304
Accounts receivable, net of allowance for credit losses of $10 and $8, respectively	1,095	981
Contract assets	214	177
Other current assets	190	189
Total current assets	1,961	1,651
Property, plant, and equipment, net of accumulated depreciation of $494 and $458 (including net PPE of $50 and $36 owned by a variable interest entity), respectively	277	239
Operating lease right-of-use assets	212	138
Goodwill	2,553	2,109
Intangible assets, net of accumulated amortization of $420 and $382, respectively	885	618
Equity in and advances to unconsolidated affiliates	188	206
Deferred income taxes	200	239
Other assets	505	365
Total assets	6,781	5,565
Current liabilities:
Accounts payable	737	593
Contract liabilities	381	359
Accrued salaries, wages and benefits	397	340
Current maturities of long-term debt	46	31
Other current liabilities	266	249
Total current liabilities	1,827	1,572
Employee compensation and benefits	128	120
Income tax payable	111	106
Deferred income taxes	84	106
Long-term debt	2,560	1,801
Operating lease liabilities	236	176
Other liabilities	321	290
Total liabilities	5,267	4,171
Commitments and Contingencies (Notes 5, 10 and 11)
KBR shareholders’ equity:
Preferred stock, $0.001 par value, 50,000,000 shares authorized, none issued	0	0
Common stock, $0.001 par value 300,000,000 shares authorized, 182,392,098 and 181,713,586 shares issued, and 133,231,050 and 135,067,562 shares outstanding, respectively	0	0
PIC	2,520	2,505
Retained earnings	1,311	1,072
Treasury stock, 49,161,048 shares and 46,646,024 shares, at cost, respectively	(1,443)	(1,279)
AOCL	(885)	(915)
Total KBR shareholders’ equity	1,503	1,383
Noncontrolling interests	11	11
Total shareholders’ equity	1,514	1,394
Total liabilities and shareholders’ equity	$ 6,781	$ 5,565

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Allowance for doubtful accounts	$ 10	$ 8
Accumulated depreciation, PP&E	494	458
Net PPE of owned by a variable interest entity	277	239
Accumulated amortization, intangibles	$ 420	$ 382
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	182,392,098	181,713,586
Common stock, shares outstanding (in shares)	133,231,050	135,067,562
Treasury stock, shares (in shares)	49,161,048	46,646,024
Variable Interest Entity, Primary Beneficiary
Net PPE of owned by a variable interest entity	$ 50	$ 36

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	PIC	Retained Earnings	Treasury Stock	AOCL	NCI
Beginning balance at Dec. 31, 2022	$ 1,632	$ 2,235	$ 1,410	$ (1,143)	$ (882)	$ 12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	16	16
Common stock issued upon exercise of stock options	5	5
Dividends declared to shareholders	(55)		(55)
Repurchases of common stock	(137)			(137)
Issuance of ESPP shares	6	3		3
Distributions to noncontrolling interests	(6)					(6)
Convertible Notes Transactions	365	365
Other	0			(1)		1
Net income (loss)	(282)		(286)			4
Other comprehensive income (loss), net of tax	21				21
Ending balance at Sep. 29, 2023	1,565	2,624	1,069	(1,278)	(861)	11
Beginning balance at Jun. 30, 2023	1,629	2,616	1,109	(1,280)	(830)	14
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	5	5
Common stock issued upon exercise of stock options	1	1
Dividends declared to shareholders	(19)		(19)
Repurchases of common stock	0
Issuance of ESPP shares	4	2		2
Distributions to noncontrolling interests	(5)					(5)
Other	(1)					(1)
Net income (loss)	(18)		(21)			3
Other comprehensive income (loss), net of tax	(31)				(31)
Ending balance at Sep. 29, 2023	1,565	2,624	1,069	(1,278)	(861)	11
Beginning balance at Dec. 29, 2023	1,394	2,505	1,072	(1,279)	(915)	11
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	16	16
Common stock issued upon exercise of stock options	2	2
Dividends declared to shareholders	(60)		(60)
Repurchases of common stock	(167)			(167)
Issuance of ESPP shares	9	5		4
Acquisition of noncontrolling interests	(10)	(8)				(2)
Distributions to noncontrolling interests	(4)					(4)
Other	1			(1)		2
Net income (loss)	303		299			4
Other comprehensive income (loss), net of tax	30				30
Ending balance at Sep. 27, 2024	1,514	2,520	1,311	(1,443)	(885)	11
Beginning balance at Jun. 28, 2024	1,411	2,519	1,231	(1,437)	(911)	9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	5	5
Common stock issued upon exercise of stock options	1	1
Dividends declared to shareholders	(20)		(20)
Repurchases of common stock	(9)			(9)
Issuance of ESPP shares	5	3		2
Acquisition of noncontrolling interests	(10)	(8)				(2)
Other	3			1		2
Net income (loss)	102		100			2
Other comprehensive income (loss), net of tax	26				26
Ending balance at Sep. 27, 2024	$ 1,514	$ 2,520	$ 1,311	$ (1,443)	$ (885)	$ 11

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share (in usd per share)	$ 0.150	$ 0.135	$ 0.450	$ 0.405

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023
Cash flows from operating activities:
Net income (loss)	$ 102	$ (18)	$ 303	$ (282)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Charges associated with Convertible Notes	0	114	0	428
Depreciation and amortization			112	104
Equity in earnings of unconsolidated affiliates	(27)	(32)	(97)	(78)
Deferred income tax			23	24
Other			24	31
Changes in operating assets and liabilities:
Accounts receivable, net of allowance for credit losses			(3)	(74)
Contract assets			(32)	43
Accounts payable			94	46
Contract liabilities			10	67
Accrued salaries, wages and benefits			32	(8)
Payments on operating lease obligation			(52)	(50)
Payments from unconsolidated affiliates, net			5	13
Distributions of earnings from unconsolidated affiliates			123	58
Pension funding			(30)	(9)
Other assets and liabilities			(90)	(65)
Total cash flows provided by operating activities			422	248
Cash flows from investing activities:
Purchases of property, plant and equipment			(54)	(60)
Proceeds from sale of assets or investments			6	0
Return of (investments in) equity method joint ventures, net			36	61
Acquisition of business, net of cash acquired			(739)	0
Funding in other investment			(5)	(39)
Other			5	(5)
Total cash flows used in investing activities			(751)	(43)
Cash flows from financing activities:
Borrowings on long-term debt			574	0
Borrowings on Revolver			343	430
Payments on short-term and long-term debt			(81)	(12)
Payments on Revolver			(63)	(270)
Payments on settlement of warrants			(33)	(101)
Proceeds from the settlement of note hedge			0	150
Payments to settle Convertible Notes			0	(250)
Debt issuance costs			(18)	(1)
Payments of dividends to shareholders			(59)	(53)
Acquisition of noncontrolling interest			(10)	0
Payments to reacquire common stock			(167)	(137)
Other			(11)	(6)
Total cash flows provided by (used in) financing activities			475	(250)
Effect of exchange rate changes on cash			12	4
Increase (decrease) in cash and cash equivalents			158	(41)
Cash and cash equivalents at beginning of period			304	389	$ 389
Cash and cash equivalents at end of period	462	348	462	348	$ 304
Noncash financing activities
Dividends declared	$ 20	$ 19	$ 20	$ 19

Basis of Presentation

Basis of Presentation	9 Months Ended
Basis of Presentation	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements were prepared using generally accepted accounting principles for interim financial information and the instructions to Form 10-Q and Regulation S-X. Accordingly, these financial statements do not include all information or notes required by generally accepted accounting principles for annual financial statements and should be read together with our 2023 Annual Report on Form 10-K. The condensed consolidated financial statements include all normal and recurring adjustments necessary to present fairly our financial position as of September 27, 2024, the results of our operations for the three and nine months ended September 27, 2024 and September 29, 2023, respectively, and our cash flows for the nine months ended September 27, 2024 and September 29, 2023, respectively. Our significant accounting policies are detailed in "Note 1. Significant Accounting Policies" of our 2023 Annual Report on Form 10-K. The Company's fiscal year ends on the Friday closest to December 31. The three months ended September 27, 2024 and September 29, 2023 contained 91 days. The nine months ended September 27, 2024 and September 29, 2023 contained 273 days. We have evaluated all events and transactions occurring after the balance sheet date but before the financial statements were issued and have included the appropriate disclosures. Principles of Consolidation

Business Segment Information

Business Segment Information	9 Months Ended
Business Segment Information	Sep. 27, 2024
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information We provide a wide range of professional services, and the management of our business is heavily focused on major projects or programs within each of our reportable segments. At any given time, government programs and joint ventures represent a substantial part of our operations. We are organized into two core business segments, Government Solutions and Sustainable Technology Solutions and one non-core business segment as described below: Government Solutions. Our Government Solutions business segment provides full life-cycle support solutions to defense, intelligence, space, aviation and other programs and missions for military and other government agencies primarily in the U.S., U.K. and Australia. KBR's services cover the full spectrum spanning research and development, advanced prototyping, acquisition support, systems engineering, C5ISR, cyber analytics, space domain awareness, test and evaluation, systems integration and program management, global supply chain management, operations readiness and support and professional advisory services across the defense, renewable energy and critical infrastructure sectors. Included in Government Solutions is the recently acquired LinQuest Corporation ("LinQuest"), an engineering, data analytics and digital integration company that develops and integrates advanced technology solutions to meet the most challenging demands across space, air dominance and connected battlespace missions, including advanced AI and machine learning capabilities. See Note 17 "Acquisitions" to our condensed consolidated financial statements for additional information on this acquisition. Sustainable Technology Solutions. Our Sustainable Technology Solutions business segment is anchored by our portfolio of over 80 innovative, proprietary, sustainability-focused process technologies that accelerate and enable energy transition across the industrial base in four primary verticals: ammonia/syngas, chemical/petrochemicals, clean refining and circular process/circular economy solutions. STS also provides highly synergistic services including advisory and consulting focused on broad-based energy transition and net-zero carbon emission solutions, high-end engineering, design and program management centered around decarbonization, energy security, energy efficiency, environmental impact and asset optimization, as well as our digitally-enabled operating and monitoring solutions. Through early planning and scope definition, advanced technologies and facility life-cycle optimization, our STS business segment works closely with customers to provide what we believe is the optimal approach to maximize their return on investment. Other. Our non-core Other segment includes corporate expenses and selling, general and administrative expenses not allocated to the business segments above. Operations by Reportable Segment Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, 2024 2023 2024 2023 Dollars in millions Revenues: Government Solutions $ 1,490 $ 1,345 $ 4,273 $ 4,025 Sustainable Technology Solutions 457 425 1,347 1,201 Total revenues $ 1,947 $ 1,770 $ 5,620 $ 5,226 Operating income (loss): Government Solutions $ 123 $ 108 $ 362 $ 182 Sustainable Technology Solutions 95 84 277 243 Other (45) (45) (119) (124) Total operating income $ 173 $ 147 $ 520 $ 301

Revenue

Revenue	9 Months Ended
Revenue	Sep. 27, 2024
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Disaggregated Revenue We disaggregate our revenue from customers by business unit, geographic destination and contract type for each of our segments as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Revenue by business unit and reportable segment was as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Government Solutions Science & Space $ 308 $ 294 $ 897 $ 860 Defense & Intel 458 397 1,272 1,143 Readiness & Sustainment 396 363 1,134 1,161 International 328 291 970 861 Total Government Solutions 1,490 1,345 4,273 4,025 Sustainable Technology Solutions 457 425 1,347 1,201 Total revenue $ 1,947 $ 1,770 $ 5,620 $ 5,226 Government Solutions revenue earned from key U.S. government customers includes U.S. DoD agencies and NASA and is reported as Science & Space, Defense & Intel and Readiness & Sustainment. Government Solutions revenue earned from non-U.S. government customers primarily includes the U.K. MoD and the Australian Defence Force and is reported as International. Revenue by geographic destination was as follows: Three Months Ended September 27, 2024 Nine Months Ended September 27, 2024 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total United States $ 906 $ 136 $ 1,042 $ 2,553 $ 392 $ 2,945 Europe 400 68 468 1,183 211 1,394 Middle East 38 140 178 111 420 531 Australia 114 20 134 325 66 391 Africa 17 30 47 50 96 146 Asia 1 36 37 7 86 93 Other countries 14 27 41 44 76 120 Total revenue $ 1,490 $ 457 $ 1,947 $ 4,273 $ 1,347 $ 5,620 Three Months Ended September 29, 2023 Nine Months Ended September 29, 2023 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total United States $ 805 $ 129 $ 934 $ 2,305 $ 398 $ 2,703 Europe 366 65 431 1,200 189 1,389 Middle East 36 100 136 102 278 380 Australia 104 27 131 311 68 379 Africa 16 33 49 51 73 124 Asia 4 46 50 12 119 131 Other countries 14 25 39 44 76 120 Total revenue $ 1,345 $ 425 $ 1,770 $ 4,025 $ 1,201 $ 5,226 Many of our contracts contain cost reimbursable, time-and-materials and fixed price components. We define contract type based on the component that represents the majority of the contract. Revenue by contract type was as follows: Three Months Ended September 27, 2024 Nine Months Ended September 27, 2024 Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 898 $ — $ 898 $ 2,581 $ — $ 2,581 Time-and-Materials 281 282 563 789 835 1,624 Fixed Price 311 175 486 903 512 1,415 Total revenue $ 1,490 $ 457 $ 1,947 $ 4,273 $ 1,347 $ 5,620 Three Months Ended September 29, 2023 Nine Months Ended September 29, 2023 Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 831 $ — $ 831 $ 2,477 $ — $ 2,477 Time-and-Materials 254 253 507 788 738 1,526 Fixed Price 260 172 432 760 463 1,223 Total revenue $ 1,345 $ 425 $ 1,770 $ 4,025 $ 1,201 $ 5,226 Performance Obligations and Contract Liabilities Changes in estimates are recognized on a cumulative catch-up basis in the current period associated with performance obligations satisfied in a prior period due to the release of a constrained milestone, modification in contract price or scope or a change in the likelihood of a contingency being resolved. We recognized revenue from performance obligations satisfied in previous periods for such matters of $24 million for the three months ended September 27, 2024, and $46 million and $8 million for the nine months ended September 27, 2024 and September 29, 2023, respectively. On September 27, 2024, we had $14.0 billion of transaction price allocated to remaining performance obligations. We expect to recognize approximately 33% of our remaining performance obligations as revenue within one year, 40% in years two through five and 27% thereafter. Revenue associated with our remaining performance obligations to be recognized beyond one year includes performance obligations primarily related to the Aspire Defence project, which has contract terms extending through 2041. Remaining performance obligations do not include variable consideration that was determined to be constrained as of September 27, 2024. We recognized revenue of $256 million and $183 million for the nine months ended September 27, 2024 and September 29, 2023, respectively, which was previously included in the contract liability balance at the beginning of each period. Accounts Receivable September 27, December 29, Dollars in millions 2024 2023 Unbilled $ 587 $ 519 Trade & other 508 462 Accounts receivable $ 1,095 $ 981

Cash and Cash Equivalents

Cash and Cash Equivalents	9 Months Ended
Cash and Cash Equivalents	Sep. 27, 2024
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents include cash balances held by our wholly-owned subsidiaries as well as cash held by joint ventures that we consolidate. Joint venture and the Aspire project cash balances are limited to specific project activities and are not available for other projects, new acquisitions and joint ventures, general cash needs or distribution to us without approval of the board of directors of the respective entities. The cash and cash equivalents held in consolidated joint ventures and the Aspire project are expected to be used for their respective project costs and distributions of earnings. The components of our cash and cash equivalents balance are as follows: September 27, 2024 Dollars in millions International (a) Domestic (b) Total Cash and cash equivalents $ 249 $ 38 $ 287 Short-term investments (c) 17 11 28 Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities (d) 131 16 147 Total $ 397 $ 65 $ 462 December 29, 2023 Dollars in millions International (a) Domestic (b) Total Cash and cash equivalents $ 122 $ 36 $ 158 Short-term investments (c) 6 8 14 Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities (d) 111 21 132 Total $ 239 $ 65 $ 304 (a) Includes deposits held by non-U.S. entities with operating accounts that constitute offshore cash for tax purposes. (b) Includes U.S. dollar and foreign currency deposits held in U.S. entities with operating accounts that constitute onshore cash for tax purposes but may reside either in the U.S. or in a foreign country. (c) Includes time deposits, money market funds and other highly liquid short-term investments. (d)

Unapproved Change Orders and Cl

Unapproved Change Orders and Claims Against Clients	9 Months Ended
Unapproved Change Orders and Claims Against Clients	Sep. 27, 2024
Contractors [Abstract]
Unapproved Change Orders and Claims Against Clients	Unapproved Change Orders and Claims Against Clients The amounts of unapproved change orders and claims against clients included in determining the profit or loss on contracts are as follows: Nine Months Ended September 27, September 29, Dollars in millions 2024 2023 Amounts included in project estimates-at-completion at beginning of fiscal year $ 74 $ 48 Net increase in project estimates 53 11 Ending balance of amounts included in project estimates-at-completion $ 127 $ 59 Amounts recognized over time based on progress $ 112 $ 59 The balance as of September 27, 2024 relates to estimated recoveries of claims associated with certain U.S. government programs in our Government Solutions segment. Changes in Project-related Estimates

Equity Method Investments and V

Equity Method Investments and Variable Interest Entities	9 Months Ended
Equity Method Investments and Variable Interest Entities	Sep. 27, 2024
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Variable Interest Entities	Equity Method Investments and Variable Interest Entities We conduct some of our operations through joint ventures, which operate through partnerships, corporations and undivided interests and other business forms and are principally accounted for using the equity method of accounting. Additionally, the majority of our joint ventures are VIEs. The following table presents a rollforward of our equity in and advances to unconsolidated affiliates: Nine Months Ended Year ended September 27, December 29, 2024 2023 Dollars in millions Beginning balance $ 206 $ 188 Equity in earnings of unconsolidated affiliates (a) 97 114 Distributions of earnings of unconsolidated affiliates (b) (131) (63) Payments from unconsolidated affiliates, net (5) (18) Return of investments in equity method investment, net (c) (36) (60) Foreign currency translation adjustments 3 3 Other (d) 54 42 Ending balance $ 188 $ 206 (a) The equity in earnings of unconsolidated affiliates in 2024 and 2023 is related to normal activities within our other joint ventures. (b) In the normal course of business, our joint ventures will declare a distribution in the current quarter that is not paid until the subsequent quarter. As such, the distributions declared during the current quarter may not agree to the distributions of earnings from unconsolidated affiliates on our condensed consolidated statements of cash flows. (c) For the nine months ended September 27, 2024, we received a return of investment from JKC of approximately $36 million related to our proportionate share of a tax refund. During the year ended December 29, 2023, we received a return of investment from JKC of approximately $61 million related to the second payment received from the Subcontractor Settlement Agreement. (d) During the nine months ended September 27, 2024, Other included the reclassification of the net liability position of $55 million related to joint ventures within our STS business segment. During the year ended December 29, 2023, Other included the reclassification of the net liability position of $47 million related to a joint venture within our STS business segment. Related Party Transactions We often provide engineering, construction management and other subcontractor services to our unconsolidated joint ventures, and our revenues include amounts related to these services. For the three and nine months ended September 27, 2024 our revenues included $190 million and $534 million, respectively, and for the three and nine months ended September 29, 2023 included $137 million and $390 million, respectively, related to the services we provided primarily to the Aspire Defence Limited joint venture within our GS business segment and a joint venture within our STS business segment. Amounts included in our condensed consolidated balance sheets related to services we provided to our unconsolidated joint ventures as of September 27, 2024, and December 29, 2023 are as follows: September 27, December 29, Dollars in millions 2024 2023 Accounts receivable, net of allowance for credit losses $ 96 $ 103 Contract liabilities $ 62 $ 89

Retirement Benefits

Retirement Benefits	9 Months Ended
Retirement Benefits	Sep. 27, 2024
Retirement Benefits [Abstract]
Retirement Benefits	Retirement Benefits We have two frozen defined benefit pension plans in the U.S., one frozen and one active plan in the U.K. and one frozen plan in Germany. The components of net periodic pension benefit related to the frozen U.K. pension for the three and nine months ended September 27, 2024 and September 29, 2023, respectively, were as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Components of net periodic pension benefit Interest cost $ 15 $ 15 $ 45 $ 45 Expected return on plan assets (28) (26) (84) (76) Amortization of prior service cost 1 1 1 1 Recognized actuarial loss — — 2 — Net periodic pension benefit $ (12) $ (10) $ (36) $ (30)

Debt and Other Credit Facilitie

Debt and Other Credit Facilities	9 Months Ended
Debt and Other Credit Facilities	Sep. 27, 2024
Debt Disclosure [Abstract]
Debt and Other Credit Facilities	Debt and Other Credit Facilities Our outstanding debt consisted of the following at the dates indicated: Dollars in millions September 27, 2024 December 29, 2023 Term Loan A $ 1,054 $ 595 Term Loan B 998 501 Senior Notes 250 250 Revolver 330 505 Unamortized debt issuance costs and discounts (26) (19) Total debt 2,606 1,832 Less: current portion 46 31 Total long-term debt, net of current portion $ 2,560 $ 1,801 Senior Credit Facility Our existing Credit Agreement, dated as of April 25, 2018, as amended ("Credit Agreement"), consists of a $1 billion revolving credit facility (the "Revolver"), a Term Loan A ("Term Loan A") with debt tranches denominated in U.S. dollars and British pound sterling and a Term Loan B ("Term Loan B" and together with the Revolver and Term Loan A, the "Senior Credit Facility"). We entered into Amendment No. 11 to our Credit Agreement on January 19, 2024. This amendment provided for an incremental Term Loan B facility in an aggregate principal amount of $1 billion and extended the Term Loan B maturity date to January 2031. We borrowed the full $1 billion principal amount available under this loan. We received $24 million in cash proceeds from this borrowing to pay accrued interest and financing fees, $501 million was applied to the outstanding principal under the Term Loan B facility and the remaining $475 million was applied to the outstanding principal under the Revolver. In addition, Amendment No. 11 reduced the interest rate margin applicable to Term Loan B. During the nine months ended September 27, 2024, $2 million in cash was paid on the outstanding Term Loan B principal. We entered into Amendment No. 12 to our Credit Agreement on February 7, 2024. This amendment consolidated all USD denominated Term Loans A including: Term A-1, Term A-2 and Term A-4 loan facilities under our Credit Agreement into the amended singular USD denominated Term A-1 loan facility and continued the GBP denominated Term A-3 loan facility outstanding at December 29, 2023. During the nine months ended September 27, 2024, $79 million in cash was paid on the outstanding Term Loan A principal and accrued interest and $20 million was applied to the Term Loan A principal using proceeds of a borrowing on our Revolver. Additionally, this amendment extended the maturity date of the $1 billion Revolver, amended Term A-1 loan facility and Term A-3 loan facility to February 2029. We entered into Amendment No. 13 to our Credit Agreement on August 14, 2024. This amendment allowed for an incremental delayed draw Term A-2 loan in an aggregate principal amount up to $550 million, which remained available for 180 days to fund the acquisition of LinQuest, maturing August 2027. On August 30, 2024, we borrowed the entire $550 million available under the delayed draw Term A-2 loan upon closing of the LinQuest acquisition. Additionally, under Amendment No. 13, we refinanced outstanding principal amounts under the Company's existing Term B loan facility via a cashless roll into a new Term B loan facility to reduce the interest rate margin applicable to Term Loan B. The applicable interest rate per annum of the new Term B loan facility is term SOFR plus 2.00% (or base rate plus 1.00%) and the maturity date is January 2031. See Note 17. "Acquisitions" to our condensed consolidated financial statements for further discussion around the acquisition of LinQuest. We had cash borrowings of $343 million and cash repayments of $63 million on our Revolver that occurred during the nine months ended September 27, 2024. The interest rates with respect to the Revolver, Term Loan A and Term Loan B are based on, at our option, the applicable adjusted reference rate plus an additional margin or base rate plus additional margin. Additionally, there is a commitment fee applicable to available amounts under the Revolver. The details of the applicable margins and commitment fees under the amended Revolver, Term Loan A-1 and Term Loan A-3 are based on our consolidated net leverage ratio as follows: Revolver, Term Loan A-1 and Term Loan A-3 Consolidated Net Leverage Ratio Reference Rate (a) Base Rate Commitment Fee Greater than or equal to 4.25 to 1.00 2.25 % 1.25 % 0.33 % Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 2.00 % 1.00 % 0.30 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 1.75 % 0.75 % 0.28 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.50 % 0.50 % 0.25 % Less than 1.25 to 1.00 1.25 % 0.25 % 0.23 % (a) The reference rate for the Revolver and the U.S. dollar tranches of Term Loan A-1 is SOFR plus 10 bps Credit Spread Adjustment and the British pound sterling tranche of Term Loan A-3 is SONIA plus 12 bps Credit Spread Adjustment. The details of the applicable margins and commitment fees under Term Loan A-2 are based on our consolidated net leverage ratio as follows: Term Loan A-2 Consolidated Net Leverage Ratio Reference Rate (a) Base Rate Commitment Fee Greater than or equal to 4.25 to 1.00 2.13 % 1.13 % 0.33 % Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 1.88 % 0.88 % 0.30 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 1.63 % 0.63 % 0.28 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.38 % 0.38 % 0.25 % Less than 1.25 to 1.00 1.13 % 0.13 % 0.23 % (a) The reference rate for Term Loan A-2 is SOFR. Both Term Loan A-1 and Term Loan A-3 provide for quarterly principal payments of 0.625% of the aggregate principal amount, increasing to 1.25% starting with the quarter ending April 3, 2026. Term Loan A-2 provides for quarterly principal payments of 0.625% of the aggregate principal amount commencing with the last business day September 2024. Term Loan B provides for quarterly principal payments of $3 million commencing with the last business day of September 2024. Each of Term Loan A-1, Term Loan A-3 and the Revolver matures in February 2029, Term Loan A-2 matures in August 2027 and Term Loan B matures in January 2031. The Senior Credit Facility contains financial covenants providing for a maximum consolidated net leverage ratio and a consolidated interest coverage ratio (as such terms are defined in the Senior Credit Facility). Our consolidated net leverage ratio as of the last day of any fiscal quarter may not exceed 4.25 to 1 in 2023, reducing to 4.00 to 1 in 2024 and thereafter. Our consolidated interest coverage ratio may not be less than 3.00 to 1 as of the last day of any fiscal quarter. As of September 27, 2024, we were in compliance with our financial covenants under our Senior Credit Facility. Senior Notes On September 30, 2020, we issued and sold $250 million aggregate principal amount of 4.750% Senior Notes due 2028 (the "Senior Notes") pursuant to an indenture among us, the guarantors party thereto and Citibank, N.A., as trustee. The Senior Notes are senior unsecured obligations and are fully and unconditionally guaranteed by each of our existing and future domestic subsidiaries that guarantee our obligations under the Senior Credit Facility and certain other indebtedness. Interest is payable semi-annually in arrears on March 30 and September 30 of each year, beginning on March 30, 2021, and the principal is due on September 30, 2028. Since September 30, 2023, we have the ability to redeem all or part of the Senior Notes at our option, at the redemption prices set forth in the Senior Notes, plus accrued and unpaid interest, if any, to (but not including) the redemption date. If we undergo a change of control, we may be required to make an offer to holders of the Senior Notes to repurchase all of the Senior Notes at a purchase price equal to 101% of the principal amount thereof, plus accrued and unpaid interest. Letters of credit, surety bonds and guarantees

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 27, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate was approximately 26% and (32)% for the nine months ended September 27, 2024 and September 29, 2023, respectively. The effective tax rate for the nine months ended September 27, 2024 as compared to the U.S. statutory rate of 21%, was primarily affected by the rate differential on our foreign earnings and the impact of state and local taxes in the U.S. The effective tax rate for the nine months ended September 29, 2023 was primarily impacted by the non-deductible portion of a legal settlement on a legacy matter and the non-deductible charge associated with the cash settlement method election and convertible notes repurchase in 2023. The implications of these non-deductible items were partially offset by the release of a previously reserved position based on developments associated with the ongoing IRS examination and appeals process for certain years. The valuation allowance for deferred tax assets as of September 27, 2024 and December 29, 2023 was $147 million and $148 million, respectively. The remaining valuation allowance is primarily related to foreign tax credit carryforwards and foreign and state net operating loss carryforwards that, in the judgment of management, do not meet the more likely than not realization threshold. The ultimate realization of deferred tax assets is dependent on the generation of future taxable income, in the appropriate character and source, during the periods in which those temporary differences become deductible or within the remaining carryforward period. Management considers the scheduled reversal of deferred tax liabilities (including the impact of available carryback and carryforward periods), projected future taxable income and tax-planning strategies in making this assessment. The utilization of the unreserved foreign tax credit carryforwards is based on our ability to generate income from foreign sources of approximately $200 million prior to their expiration. The utilization of other net deferred tax assets, excluding those associated with indefinite-lived intangible assets, is based on our ability to generate U.S. forecasted taxable income of approximately $1,033 million. Changes in our forecasted taxable income, in the appropriate character and source, as well as jurisdiction, could affect the ultimate realization of deferred tax assets.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 27, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are a party to litigation and other proceedings that arise in the ordinary course of our business. These types of matters could result in fines, penalties, cost reimbursements or contributions, compensatory or treble damages or non-monetary sanctions or relief. We believe the probability is remote that the outcome of any individual matter, including the matters described below, will have a material adverse effect on the corporation as a whole, notwithstanding that the unfavorable resolution of any matter may have a material effect on our net earnings and cash flows in any particular reporting period. Among the factors that we consider in this assessment are the nature of existing legal proceedings and claims, the asserted or possible damages or loss contingency (if estimable), the progress of the case, existing law and precedent, the opinions or views of legal counsel and other advisers, our experience in similar cases and the experience of other companies, the facts available to us at the time of assessment and how we intend to respond to the proceeding or claim. Our assessment of these factors may change over time as individual proceedings or claims progress.

U.S. Government Matters

U.S. Government Matters	9 Months Ended
U.S. Government Matters	Sep. 27, 2024
United States Government Contract Work [Abstract]
U.S. Government Matters	U.S. Government Matters We provide services to various U.S. governmental agencies, including the U.S. DoD, NASA and the Department of State. The negotiation, administration and settlement of our contracts are subject to audit by the DCAA. The DCAA serves in an advisory role to the DCMA, which is responsible for the administration of the majority of our contracts. The scope of these audits includes, among other things, the validity of direct and indirect incurred costs, provisional approval of annual billing rates, approval of annual overhead rates, compliance with the FAR and CAS, compliance with certain unique contract clauses and audits of certain aspects of our internal control systems. Based on the information received to date, we do not believe any completed or ongoing government audits will have a material adverse impact on our results of operations, financial position or cash flows. The U.S. government also retains the right to pursue various remedies under any of these contracts which could result in challenges to expenditures, suspension of payments, fines and suspensions or debarment from future business with the U.S. government. We accrued for probable and reasonably estimable unallowable costs associated with open government matters related to our GS business in the amounts of $35 million as of September 27, 2024 and $45 million as of December 29, 2023, which are recorded in other liabilities on our condensed consolidated balance sheets. Legacy U.S. Government Matters Between 2002 and 2011, we provided significant support to the U.S. Army and other U.S. government agencies in support of the war in Iraq under the LogCAP III contract. We have been closing out the LogCAP III contract since 2011, and we expect the contract closeout process to continue for at least another year. As a result of our work under LogCAP III, there are claims and disputes pending between us and the U.S. government that need to be resolved in order to close the contract. The contract closeout process includes administratively closing the individual task orders issued under the contract. We continue to work with the U.S. government to resolve the issues to close the remaining task orders, which includes ongoing litigation of third-party vendor disputes. We also have matters related to ongoing litigation or investigations involving U.S. government contracts. We anticipate billing additional labor, vendor resolution and litigation costs as we resolve the open matters in the future. First Kuwaiti Trading Company arbitration.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
Accumulated Other Comprehensive Loss	Sep. 27, 2024
Stockholders' Equity Note [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Changes in AOCL, net of tax, by component Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 29, 2023 $ (300) $ (644) $ 29 $ (915) Other comprehensive income (loss) adjustments before reclassifications 39 1 5 45 Amounts reclassified from AOCL — 3 (18) (15) Net other comprehensive income (loss) 39 4 (13) 30 Balance at September 27, 2024 $ (261) $ (640) $ 16 $ (885) Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2022 $ (352) $ (568) $ 38 $ (882) Other comprehensive income adjustments before reclassifications 5 — 29 34 Amounts reclassified from AOCL — 1 (14) (13) Net other comprehensive income 5 1 15 21 Balance at September 29, 2023 $ (347) $ (567) $ 53 $ (861) Reclassifications out of AOCL, net of tax, by component Nine Months Ended September 27, September 29, Dollars in millions 2024 2023 Affected line item on the Condensed Consolidated Statements of Operations Accumulated pension liability adjustments Amortization of prior service cost $ (1) $ (1) See (a) below Recognized actuarial loss (2) — See (a) below Net pension and post-retirement benefits $ (3) $ (1) Net of tax Changes in fair value for derivatives Foreign currency hedge and interest rate swap settlements $ 22 $ 17 Other non-operating expense Tax expense (4) (3) Provision for income taxes Net changes in fair value of derivatives $ 18 $ 14 Net of tax (a) This item is included in the computation of net periodic pension cost. See Note 7 "Retirement Benefits" to our condensed consolidated financial statements for further discussion.

Share Repurchases

Share Repurchases	9 Months Ended
Share Repurchases	Sep. 27, 2024
Equity [Abstract]
Share Repurchases	Share Repurchases Authorized Share Repurchase Program On February 25, 2014, the Board of Directors authorized a plan to repurchase our outstanding shares of common stock, which replaced and terminated the August 26, 2011 share repurchase program. On February 19, 2024, the Board of Directors authorized $174 million of additional share repurchases to be added to the prior authorizations, which returned the total amount authorized and available for repurchase under the share repurchase program to $500 million. As of September 27, 2024, $346 million remained available for repurchase under this authorization. The authorization does not obligate us to acquire any particular number of shares of common stock and may be commenced, suspended or discontinued without prior notice. The share repurchases are intended to be funded through our current and future cash flows and the authorization does not have an expiration date. Withheld to Cover Program We have in place a "withhold to cover" program, which allows us to withhold common shares from employees in connection with the settlement of income tax and related benefit withholding obligations arising from the issuance of share-based equity awards under the KBR, Inc. 2006 Stock and Incentive Plan. The table below presents information on our share repurchases activity under these programs: Three Months Ended Nine Months Ended September 27, 2024 September 27, 2024 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the authorized share repurchase program 117,066 $ 64.04 $ 8 2,455,421 $ 62.71 $ 154 Withhold to cover shares 20,237 64.10 1 215,648 59.73 13 Total 137,303 $ 64.05 $ 9 2,671,069 $ 62.47 $ 167 Three Months Ended Nine Months Ended September 29, 2023 September 29, 2023 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the authorized share repurchase program — $ — $ — 2,222,293 $ 56.23 $ 125 Withhold to cover shares 4,244 61.47 — 218,842 54.07 12 Total 4,244 $ 61.47 $ — 2,441,135 $ 56.04 $ 137

Income (loss) per Share

Income (loss) per Share	9 Months Ended
Income (loss) per Share	Sep. 27, 2024
Earnings Per Share [Abstract]
Income (loss) per Share	Income (loss) per Share Basic income (loss) per share is based upon the weighted average number of common shares outstanding during the period. Diluted income (loss) per share includes additional common shares that would have been outstanding if potential common shares with a dilutive effect had been issued using the if-converted method for Convertible Debt and the treasury stock method for all other instruments. A summary of the basic and diluted net income (loss) per share calculations is as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Shares in millions 2024 2023 2024 2023 Net income (loss) attributable to KBR: Net Income (loss) attributable to KBR $ 100 $ (21) $ 299 $ (286) Less earnings allocable to participating securities $ — $ — $ (1) $ — Basic net income (loss) attributable to KBR $ 100 $ (21) $ 298 $ (286) Diluted net income (loss) attributable to KBR $ 100 $ (21) $ 298 $ (286) Weighted average common shares outstanding: Basic weighted average common shares outstanding 133 135 134 136 Diluted weighted average common shares outstanding 133 135 134 136 Net income (loss) attributable to KBR per share: Basic $ 0.75 $ (0.16) $ 2.22 $ (2.10) Diluted $ 0.75 $ (0.16) $ 2.22 $ (2.10) For the three and nine months ended September 27, 2024, the diluted net income (loss) attributable to KBR per share calculation excluded the following weighted-average potential common shares because their inclusion would have been anti-dilutive: 0.2 million related to our stock options and restricted stock awards. Due to our net loss position for the three and nine months ended September 29, 2023, our basic net loss attributable to KBR per share and diluted net loss attributable to KBR per share are identical as the effect of all potential common shares is anti-dilutive and therefore excluded. For the three months ended September 29, 2023, the diluted net income (loss) attributable to KBR per share calculation excluded the following weighted-average potential common shares because their inclusion would have been anti-dilutive: 9.9 million related to the Warrant Transactions and 1.3 million related to our stock options and restricted stock awards. For the nine months ended September 29, 2023, the diluted net income (loss) attributable to KBR per share calculation excluded the following weighted-average potential common shares because their inclusion would have been anti-dilutive: 5.3 million related to the Convertible Debt, 12.1 million related to the Warrant Transactions and 1.4 million related to our stock options and restricted stock awards.

Fair Value of Financial Instrum

Fair Value of Financial Instruments and Risk Management	9 Months Ended
Fair Value of Financial Instruments and Risk Management	Sep. 27, 2024
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments and Risk Management	Fair Value of Financial Instruments and Risk Management Fair value measurements. The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We utilize a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. The carrying amount of cash and cash equivalents, accounts receivable and accounts payable, as reflected in the condensed consolidated balance sheets, approximates fair value due to the short-term maturities of these financial instruments. The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in our condensed consolidated balance sheets are provided in the following table. September 27, 2024 December 29, 2023 Dollars in millions Carrying Value Fair Value Carrying Value Fair Value Liabilities (including current maturities): Term Loan A Level 2 $ 1,054 $ 1,054 $ 595 $ 595 Term Loan B Level 2 998 999 501 503 Senior Notes Level 2 250 241 250 231 Revolver Level 2 330 330 505 505 Derivative Liability - Warrants Level 2 — — 33 33 The carrying value of the debt instruments listed above exclude debt issuance costs for the respective instrument. See Note 8 "Debt and Other Credit Facilities" for the debt issuance costs of our debt instruments and further discussion of our term loans, Senior Notes and Revolver. We paid the outstanding warrant derivative liability at December 29, 2023 of $33 million in 2024. The following disclosures for foreign currency risk and interest rate risk includes the fair value hierarchy levels for our assets and liabilities that are measured at fair value on a recurring basis. Foreign currency risk. We conduct business globally in numerous currencies and are therefore exposed to foreign currency fluctuations. We may use derivative instruments to reduce the volatility of earnings and cash flows associated with changes in foreign currency exchange rates. We do not use derivative instruments for speculative trading purposes. We generally utilize foreign currency exchange forwards and option contracts to hedge exposures associated with forecasted future cash flows and to hedge exposures present on our balance sheet. As of September 27, 2024, the gross notional value of our foreign currency exchange forwards and option contracts used to hedge balance sheet exposures was $52 million, all of which had durations of 30 days or less. The fair value of our balance sheet hedges are included in other current assets, other assets and other liabilities on our condensed consolidated balance sheets at September 27, 2024, and December 29, 2023. The fair values of these derivatives are considered Level 2 under ASC 820, Fair Value Measurement, as they are based on quoted prices directly observable in active markets. The following table summarizes the recognized changes in fair value of our balance sheet hedges offset by remeasurement of balance sheet positions. These amounts are recognized in our condensed consolidated statements of operations for the periods presented. The net of our changes in fair value of hedges and the remeasurement of our assets and liabilities is included in other non-operating expense on our condensed consolidated statements of operations. Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Balance Sheet Hedges - Fair Value $ (1) $ (1) $ (2) $ — Balance Sheet Position - Remeasurement (2) — (3) (4) Net gain (loss) $ (3) $ (1) $ (5) $ (4) Interest rate risk. We use interest rate swaps to reduce interest rate risk and to manage net interest expense by converting a portion of our variable rate debt under our Senior Credit Facility into fixed-rate debt. During the three months ended September 27, 2024, we entered into additional interest rate swap agreements to term SOFR, which became effective September 30, 2024. Our portfolio of interest rate swaps consists of the following: Dollars in millions Notional Amount at September 27, 2024* Pay Fixed Rate (Weighted Average) Receive Variable Rate Settlement and Termination March 2020 Interest Rate Swaps $ 400 0.89 % Term SOFR Monthly through January 2027 September 2022 Interest Rate Swaps $ 350 3.43 % Term SOFR Monthly through January 2027 March 2023 Interest Rate Swaps $ 205 3.61 % Term SOFR Monthly through January 2027 March 2023 Amortizing Interest Rate Swaps £ 111 3.81 % Term SONIA Monthly through November 2026 September 2024 Interest Rate Swaps $ 200 3.27 % Term SOFR Monthly through August 2027 *Includes the September 2024 interest rate swaps that became effective September 30, 2024. Our interest rate swaps are reported at fair value using Level 2 inputs. The fair value of the interest rate swaps at September 27, 2024 was a $21 million net asset, of which $17 million is included in other current assets, $10 million is included in other assets and $6 million is included in other liabilities. The unrealized net gain on these interest rate swaps was $21 million and is included in AOCL as of September 27, 2024. The fair value of the interest rate swaps at December 29, 2023 was a $36 million net asset, of which $24 million is included in other current assets, $18 million is included in other assets and $6 million is included in other liabilities. The unrealized net gains on these interest rate swaps was $36 million and is included in AOCL as of December 29, 2023. Sales of Receivables. From time to time, we sell certain receivables to unrelated third-party financial institutions under various accounts receivable monetization programs. One such program is with MUFG Bank, Ltd. (“MUFG”) under a Master Accounts Receivable Purchase Agreement (the “RPA”), which provides the sale to MUFG of certain of our designated eligible receivables, with a significant portion of such receivables being owed by the U.S. government. During the nine months ended September 27, 2024, we derecognized $2,324 million of accounts receivables from the balance sheet under these agreements, of which certain receivables totaling $2,290 million were sold under the MUFG RPA. The fair value of the sold receivables approximated their book value due to their short-term nature. The fees incurred are presented in other non-operating expense on the condensed consolidated statements of operations. Activity for third-party financial institutions consisted of the following: Nine Months Ended Dollars in millions September 27, 2024 September 29, 2023 Beginning balance $ 135 $ 134 Sale of receivables 2,324 2,250 Settlement of receivables (2,318) (2,243) Cash collected, not yet remitted (39) — Outstanding balances sold to financial institutions $ 102 $ 141 Other Investments.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Sep. 27, 2024
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements New accounting pronouncements requiring implementation in future periods are discussed below. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. ASU 2023-07 requires disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss, an amount and description of its composition for other segment items to reconcile to segment profit or loss, and the title and position of the entity’s CODM. The amendments in this update also expand the interim segment disclosure requirements. ASU 2023-07 will be effective for our 2024 fiscal year and for interim periods starting in our first quarter of fiscal year 2025. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition.

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 27, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions	Acquisitions LinQuest Corporation On August 30, 2024, we acquired LinQuest, an engineering, data analytics and digital integration company that develops and integrates advanced technology solutions to meet the most challenging demands across space, air dominance and connected battlespace missions, including advanced AI and machine learning capabilities. LinQuest supports the U.S. Air Force and other U.S. Department of Defense and intelligence agencies. We accounted for this transaction as an acquisition of a business using the acquisition method under Business Combinations (Topic 805) . The aggregate consideration paid upon closing was $739 million in cash, net of cash acquired, subject to certain working capital, net debt and other post-closing adjustments. The Company funded the acquisition through a combination of cash on-hand, $550 million in borrowings under the delayed draw term A-2 loan, $50 million in borrowings on our Revolver and proceeds from the sale of receivables. See Note 8 "Debt and Other Credit Facilities" for further discussion around these borrowings on our Senior Credit Facility. We have recorded $3 million during the three and nine months ended September 27, 2024, respectively, in acquisition-related costs related to LinQuest, which are included in “Selling, general and administrative expenses” on the condensed consolidated statements of operations. As of September 27, 2024, the purchase price allocation is preliminary and is based on the book values of the assets acquired and liabilities assumed and preliminary estimates of intangibles. We are finalizing the purchase price including verifying assets acquired, liabilities assumed and third party evaluations of the intangible assets. The following table summarizes the consideration paid for this acquisition and the fair value of assets acquired and liabilities assumed as of the acquisition date on August 30, 2024: Dollars in millions LinQuest Fair value of total consideration paid $ 750 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and equivalents 11 Accounts receivable 98 Contract assets 2 Other current assets 4 Total current assets 115 Property, plant, and equipment 15 Operating lease right-of-use assets 37 Intangible assets 290 Equity in and advances to unconsolidated affiliates 1 Deferred income taxes 2 Other assets 1 Total assets 461 Accounts payable 35 Contract liabilities 7 Accrued salaries, wages and benefits 32 Other current liabilities 8 Total current liabilities 82 Operating lease liabilities 30 Other liabilities 16 Total liabilities 128 Net assets acquired 333 Goodwill $ 417 The goodwill recognized of $417 million arising from this acquisition is recorded within our GS segment and primarily relates to future growth opportunities, a highly skilled assembled workforce and other expected synergies from the combined operations. For U.S. tax purposes, the transaction is treated as a stock deal. As a result, there is no step-up in tax basis and the goodwill recognized is not deductible for tax purposes. The following table summarizes the fair value of intangible assets and the related weighted-average useful lives: Dollars in millions Fair Value Weighted Average Amortization Period (in years) Funded backlog $ 10 1 Customer relationships 280 13 Total intangible assets $ 290 13 The estimated backlog intangible asset is backlog that represents revenue that is already fully awarded and funded as of the acquisition date. The estimated customer relationships intangible assets consist of unfunded backlog as of the acquisition date and revenue arising from existing, recompete, and follow-on programs. The funded backlog and customer relationships intangible assets were preliminarily valued using the income approach, specifically the multi-period excess earnings method in which the value is derived from an estimation of the after-tax cash flows specifically attributable to funded backlog and customer relationships. In connection with this analysis, certain assumptions were made with respect to forecasted revenues and EBITDA margins, contributory asset charge rates, weighted average cost of capital, and a tax amortization benefit. The following supplemental pro forma, combined financial information has been prepared from historical financial statements that have been adjusted to give effect to the acquisition of LinQuest as though it had been acquired on January 1, 2023. Pro forma adjustments were primarily related to the amortization of intangibles and interest on borrowings related to the acquisition. Accordingly, this supplemental pro forma financial information is presented for informational purposes only and is not necessarily indicative of what the actual results of operations of the combined company would have been had the acquisition occurred on January 1, 2023, nor is it indicative of future results of operations. Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 (Unaudited) Revenue $ 2,042 $ 1,894 $ 5,984 $ 5,581 Net income attributable to KBR $ 86 $ (34) 269 (326) Diluted earnings per share $ 0.65 $ (0.25) $ 2.01 $ (2.40) Following the closing of the acquisition on August 30, 2024, the acquired LinQuest business has contributed $41 million of revenues and $4 million of gross profit within our GS business segment during both the three and nine months ended September 27, 2024 .

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Pay vs Performance Disclosure
Net Income (loss) attributable to KBR	$ 100	$ (21)	$ 299	$ (286)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 27, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
Basis of Presentation (Policies)	Sep. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Principles of Consolidation	Principles of Consolidation
Recent Accounting Pronouncements	Recent Accounting Pronouncements New accounting pronouncements requiring implementation in future periods are discussed below. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. ASU 2023-07 requires disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss, an amount and description of its composition for other segment items to reconcile to segment profit or loss, and the title and position of the entity’s CODM. The amendments in this update also expand the interim segment disclosure requirements. ASU 2023-07 will be effective for our 2024 fiscal year and for interim periods starting in our first quarter of fiscal year 2025. We expect this ASU to only impact our disclosures with no impacts to our results of operations, cash flows and financial condition.

Business Segment Information (T

Business Segment Information (Tables)	9 Months Ended
Business Segment Information (Tables)	Sep. 27, 2024
Segment Reporting [Abstract]
Schedule of Operations by Reportable Segment	Operations by Reportable Segment Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, 2024 2023 2024 2023 Dollars in millions Revenues: Government Solutions $ 1,490 $ 1,345 $ 4,273 $ 4,025 Sustainable Technology Solutions 457 425 1,347 1,201 Total revenues $ 1,947 $ 1,770 $ 5,620 $ 5,226 Operating income (loss): Government Solutions $ 123 $ 108 $ 362 $ 182 Sustainable Technology Solutions 95 84 277 243 Other (45) (45) (119) (124) Total operating income $ 173 $ 147 $ 520 $ 301

Revenue (Tables)

Revenue (Tables)	9 Months Ended
Revenue (Tables)	Sep. 27, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	Revenue by business unit and reportable segment was as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Government Solutions Science & Space $ 308 $ 294 $ 897 $ 860 Defense & Intel 458 397 1,272 1,143 Readiness & Sustainment 396 363 1,134 1,161 International 328 291 970 861 Total Government Solutions 1,490 1,345 4,273 4,025 Sustainable Technology Solutions 457 425 1,347 1,201 Total revenue $ 1,947 $ 1,770 $ 5,620 $ 5,226 Revenue by geographic destination was as follows: Three Months Ended September 27, 2024 Nine Months Ended September 27, 2024 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total United States $ 906 $ 136 $ 1,042 $ 2,553 $ 392 $ 2,945 Europe 400 68 468 1,183 211 1,394 Middle East 38 140 178 111 420 531 Australia 114 20 134 325 66 391 Africa 17 30 47 50 96 146 Asia 1 36 37 7 86 93 Other countries 14 27 41 44 76 120 Total revenue $ 1,490 $ 457 $ 1,947 $ 4,273 $ 1,347 $ 5,620 Three Months Ended September 29, 2023 Nine Months Ended September 29, 2023 Total by Countries/Regions Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total United States $ 805 $ 129 $ 934 $ 2,305 $ 398 $ 2,703 Europe 366 65 431 1,200 189 1,389 Middle East 36 100 136 102 278 380 Australia 104 27 131 311 68 379 Africa 16 33 49 51 73 124 Asia 4 46 50 12 119 131 Other countries 14 25 39 44 76 120 Total revenue $ 1,345 $ 425 $ 1,770 $ 4,025 $ 1,201 $ 5,226 Three Months Ended September 27, 2024 Nine Months Ended September 27, 2024 Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 898 $ — $ 898 $ 2,581 $ — $ 2,581 Time-and-Materials 281 282 563 789 835 1,624 Fixed Price 311 175 486 903 512 1,415 Total revenue $ 1,490 $ 457 $ 1,947 $ 4,273 $ 1,347 $ 5,620 Three Months Ended September 29, 2023 Nine Months Ended September 29, 2023 Dollars in millions Government Solutions Sustainable Technology Solutions Total Government Solutions Sustainable Technology Solutions Total Cost Reimbursable $ 831 $ — $ 831 $ 2,477 $ — $ 2,477 Time-and-Materials 254 253 507 788 738 1,526 Fixed Price 260 172 432 760 463 1,223 Total revenue $ 1,345 $ 425 $ 1,770 $ 4,025 $ 1,201 $ 5,226
Schedule of Accounts Receivable	September 27, December 29, Dollars in millions 2024 2023 Unbilled $ 587 $ 519 Trade & other 508 462 Accounts receivable $ 1,095 $ 981

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	9 Months Ended
Cash and Cash Equivalents (Tables)	Sep. 27, 2024
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	The components of our cash and cash equivalents balance are as follows: September 27, 2024 Dollars in millions International (a) Domestic (b) Total Cash and cash equivalents $ 249 $ 38 $ 287 Short-term investments (c) 17 11 28 Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities (d) 131 16 147 Total $ 397 $ 65 $ 462 December 29, 2023 Dollars in millions International (a) Domestic (b) Total Cash and cash equivalents $ 122 $ 36 $ 158 Short-term investments (c) 6 8 14 Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities (d) 111 21 132 Total $ 239 $ 65 $ 304 (a) Includes deposits held by non-U.S. entities with operating accounts that constitute offshore cash for tax purposes. (b) Includes U.S. dollar and foreign currency deposits held in U.S. entities with operating accounts that constitute onshore cash for tax purposes but may reside either in the U.S. or in a foreign country. (c) Includes time deposits, money market funds and other highly liquid short-term investments. (d)

Unapproved Change Orders and _2

Unapproved Change Orders and Claims Against Clients (Tables)	9 Months Ended
	Sep. 27, 2024
Contractors [Abstract]
Schedule of Unapproved Change Orders and Claims	The amounts of unapproved change orders and claims against clients included in determining the profit or loss on contracts are as follows: Nine Months Ended September 27, September 29, Dollars in millions 2024 2023 Amounts included in project estimates-at-completion at beginning of fiscal year $ 74 $ 48 Net increase in project estimates 53 11 Ending balance of amounts included in project estimates-at-completion $ 127 $ 59 Amounts recognized over time based on progress $ 112 $ 59

Equity Method Investments and_2

Equity Method Investments and Variable Interest Entities (Tables)	9 Months Ended
	Sep. 27, 2024
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity in Earnings of Unconsolidated Affiliates	The following table presents a rollforward of our equity in and advances to unconsolidated affiliates: Nine Months Ended Year ended September 27, December 29, 2024 2023 Dollars in millions Beginning balance $ 206 $ 188 Equity in earnings of unconsolidated affiliates (a) 97 114 Distributions of earnings of unconsolidated affiliates (b) (131) (63) Payments from unconsolidated affiliates, net (5) (18) Return of investments in equity method investment, net (c) (36) (60) Foreign currency translation adjustments 3 3 Other (d) 54 42 Ending balance $ 188 $ 206 (a) The equity in earnings of unconsolidated affiliates in 2024 and 2023 is related to normal activities within our other joint ventures. (b) In the normal course of business, our joint ventures will declare a distribution in the current quarter that is not paid until the subsequent quarter. As such, the distributions declared during the current quarter may not agree to the distributions of earnings from unconsolidated affiliates on our condensed consolidated statements of cash flows. (c) For the nine months ended September 27, 2024, we received a return of investment from JKC of approximately $36 million related to our proportionate share of a tax refund. During the year ended December 29, 2023, we received a return of investment from JKC of approximately $61 million related to the second payment received from the Subcontractor Settlement Agreement. (d)
Schedule of Services Provided to Unconsolidated JV's	Amounts included in our condensed consolidated balance sheets related to services we provided to our unconsolidated joint ventures as of September 27, 2024, and December 29, 2023 are as follows: September 27, December 29, Dollars in millions 2024 2023 Accounts receivable, net of allowance for credit losses $ 96 $ 103 Contract liabilities $ 62 $ 89

Retirement Benefits (Tables)

Retirement Benefits (Tables)	9 Months Ended
Retirement Benefits (Tables)	Sep. 27, 2024
Retirement Benefits [Abstract]
Schedule of Net Periodic Pension Benefit	The components of net periodic pension benefit related to the frozen U.K. pension for the three and nine months ended September 27, 2024 and September 29, 2023, respectively, were as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Components of net periodic pension benefit Interest cost $ 15 $ 15 $ 45 $ 45 Expected return on plan assets (28) (26) (84) (76) Amortization of prior service cost 1 1 1 1 Recognized actuarial loss — — 2 — Net periodic pension benefit $ (12) $ (10) $ (36) $ (30)

Debt and Other Credit Facilit_2

Debt and Other Credit Facilities (Tables)	9 Months Ended
Debt and Other Credit Facilities (Tables)	Sep. 27, 2024
Debt Disclosure [Abstract]
Schedule of Outstanding Debt	Our outstanding debt consisted of the following at the dates indicated: Dollars in millions September 27, 2024 December 29, 2023 Term Loan A $ 1,054 $ 595 Term Loan B 998 501 Senior Notes 250 250 Revolver 330 505 Unamortized debt issuance costs and discounts (26) (19) Total debt 2,606 1,832 Less: current portion 46 31 Total long-term debt, net of current portion $ 2,560 $ 1,801 The details of the applicable margins and commitment fees under the amended Revolver, Term Loan A-1 and Term Loan A-3 are based on our consolidated net leverage ratio as follows: Revolver, Term Loan A-1 and Term Loan A-3 Consolidated Net Leverage Ratio Reference Rate (a) Base Rate Commitment Fee Greater than or equal to 4.25 to 1.00 2.25 % 1.25 % 0.33 % Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 2.00 % 1.00 % 0.30 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 1.75 % 0.75 % 0.28 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.50 % 0.50 % 0.25 % Less than 1.25 to 1.00 1.25 % 0.25 % 0.23 % (a) The reference rate for the Revolver and the U.S. dollar tranches of Term Loan A-1 is SOFR plus 10 bps Credit Spread Adjustment and the British pound sterling tranche of Term Loan A-3 is SONIA plus 12 bps Credit Spread Adjustment. The details of the applicable margins and commitment fees under Term Loan A-2 are based on our consolidated net leverage ratio as follows: Term Loan A-2 Consolidated Net Leverage Ratio Reference Rate (a) Base Rate Commitment Fee Greater than or equal to 4.25 to 1.00 2.13 % 1.13 % 0.33 % Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 1.88 % 0.88 % 0.30 % Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 1.63 % 0.63 % 0.28 % Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 1.38 % 0.38 % 0.25 % Less than 1.25 to 1.00 1.13 % 0.13 % 0.23 % (a) The reference rate for Term Loan A-2 is SOFR.

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
Accumulated Other Comprehensive Loss (Tables)	Sep. 27, 2024
Stockholders' Equity Note [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	Changes in AOCL, net of tax, by component Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 29, 2023 $ (300) $ (644) $ 29 $ (915) Other comprehensive income (loss) adjustments before reclassifications 39 1 5 45 Amounts reclassified from AOCL — 3 (18) (15) Net other comprehensive income (loss) 39 4 (13) 30 Balance at September 27, 2024 $ (261) $ (640) $ 16 $ (885) Dollars in millions Accumulated foreign currency translation adjustments Accumulated pension liability adjustments Changes in fair value of derivatives Total Balance at December 31, 2022 $ (352) $ (568) $ 38 $ (882) Other comprehensive income adjustments before reclassifications 5 — 29 34 Amounts reclassified from AOCL — 1 (14) (13) Net other comprehensive income 5 1 15 21 Balance at September 29, 2023 $ (347) $ (567) $ 53 $ (861)
Schedule of Reclassification Out of Accumulated Other Comprehensive Income	Reclassifications out of AOCL, net of tax, by component Nine Months Ended September 27, September 29, Dollars in millions 2024 2023 Affected line item on the Condensed Consolidated Statements of Operations Accumulated pension liability adjustments Amortization of prior service cost $ (1) $ (1) See (a) below Recognized actuarial loss (2) — See (a) below Net pension and post-retirement benefits $ (3) $ (1) Net of tax Changes in fair value for derivatives Foreign currency hedge and interest rate swap settlements $ 22 $ 17 Other non-operating expense Tax expense (4) (3) Provision for income taxes Net changes in fair value of derivatives $ 18 $ 14 Net of tax (a) This item is included in the computation of net periodic pension cost. See Note 7 "Retirement Benefits" to our condensed consolidated financial statements for further discussion.

Share Repurchases (Tables)

Share Repurchases (Tables)	9 Months Ended
Share Repurchases (Tables)	Sep. 27, 2024
Equity [Abstract]
Schedule of Shares Repurchased	The table below presents information on our share repurchases activity under these programs: Three Months Ended Nine Months Ended September 27, 2024 September 27, 2024 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the authorized share repurchase program 117,066 $ 64.04 $ 8 2,455,421 $ 62.71 $ 154 Withhold to cover shares 20,237 64.10 1 215,648 59.73 13 Total 137,303 $ 64.05 $ 9 2,671,069 $ 62.47 $ 167 Three Months Ended Nine Months Ended September 29, 2023 September 29, 2023 Number of Shares Average Price per Share Dollars in Millions Number of Shares Average Price per Share Dollars in Millions Repurchases under the authorized share repurchase program — $ — $ — 2,222,293 $ 56.23 $ 125 Withhold to cover shares 4,244 61.47 — 218,842 54.07 12 Total 4,244 $ 61.47 $ — 2,441,135 $ 56.04 $ 137

Income (loss) per Share (Tables

Income (loss) per Share (Tables)	9 Months Ended
Income (loss) per Share (Tables)	Sep. 27, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Income (Loss) Per Share	A summary of the basic and diluted net income (loss) per share calculations is as follows: Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Shares in millions 2024 2023 2024 2023 Net income (loss) attributable to KBR: Net Income (loss) attributable to KBR $ 100 $ (21) $ 299 $ (286) Less earnings allocable to participating securities $ — $ — $ (1) $ — Basic net income (loss) attributable to KBR $ 100 $ (21) $ 298 $ (286) Diluted net income (loss) attributable to KBR $ 100 $ (21) $ 298 $ (286) Weighted average common shares outstanding: Basic weighted average common shares outstanding 133 135 134 136 Diluted weighted average common shares outstanding 133 135 134 136 Net income (loss) attributable to KBR per share: Basic $ 0.75 $ (0.16) $ 2.22 $ (2.10) Diluted $ 0.75 $ (0.16) $ 2.22 $ (2.10)

Fair Value of Financial Instr_2

Fair Value of Financial Instruments and Risk Management (Tables)	9 Months Ended
	Sep. 27, 2024
Fair Value Disclosures [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Financial Instruments	The carrying values and estimated fair values of our financial instruments that are not required to be recorded at fair value in our condensed consolidated balance sheets are provided in the following table. September 27, 2024 December 29, 2023 Dollars in millions Carrying Value Fair Value Carrying Value Fair Value Liabilities (including current maturities): Term Loan A Level 2 $ 1,054 $ 1,054 $ 595 $ 595 Term Loan B Level 2 998 999 501 503 Senior Notes Level 2 250 241 250 231 Revolver Level 2 330 330 505 505 Derivative Liability - Warrants Level 2 — — 33 33
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location	The following table summarizes the recognized changes in fair value of our balance sheet hedges offset by remeasurement of balance sheet positions. These amounts are recognized in our condensed consolidated statements of operations for the periods presented. The net of our changes in fair value of hedges and the remeasurement of our assets and liabilities is included in other non-operating expense on our condensed consolidated statements of operations. Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 Balance Sheet Hedges - Fair Value $ (1) $ (1) $ (2) $ — Balance Sheet Position - Remeasurement (2) — (3) (4) Net gain (loss) $ (3) $ (1) $ (5) $ (4)
Schedule of Interest Rate Swaps	Our portfolio of interest rate swaps consists of the following: Dollars in millions Notional Amount at September 27, 2024* Pay Fixed Rate (Weighted Average) Receive Variable Rate Settlement and Termination March 2020 Interest Rate Swaps $ 400 0.89 % Term SOFR Monthly through January 2027 September 2022 Interest Rate Swaps $ 350 3.43 % Term SOFR Monthly through January 2027 March 2023 Interest Rate Swaps $ 205 3.61 % Term SOFR Monthly through January 2027 March 2023 Amortizing Interest Rate Swaps £ 111 3.81 % Term SONIA Monthly through November 2026 September 2024 Interest Rate Swaps $ 200 3.27 % Term SOFR Monthly through August 2027 *Includes the September 2024 interest rate swaps that became effective September 30, 2024.
Schedule of Sale of Receivables Activity	Activity for third-party financial institutions consisted of the following: Nine Months Ended Dollars in millions September 27, 2024 September 29, 2023 Beginning balance $ 135 $ 134 Sale of receivables 2,324 2,250 Settlement of receivables (2,318) (2,243) Cash collected, not yet remitted (39) — Outstanding balances sold to financial institutions $ 102 $ 141

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 27, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Schedule of Consideration Paid forAcquisition and Fair Value of Assets and Liabilities Assumed	The following table summarizes the consideration paid for this acquisition and the fair value of assets acquired and liabilities assumed as of the acquisition date on August 30, 2024: Dollars in millions LinQuest Fair value of total consideration paid $ 750 Recognized amounts of identifiable assets acquired and liabilities assumed: Cash and equivalents 11 Accounts receivable 98 Contract assets 2 Other current assets 4 Total current assets 115 Property, plant, and equipment 15 Operating lease right-of-use assets 37 Intangible assets 290 Equity in and advances to unconsolidated affiliates 1 Deferred income taxes 2 Other assets 1 Total assets 461 Accounts payable 35 Contract liabilities 7 Accrued salaries, wages and benefits 32 Other current liabilities 8 Total current liabilities 82 Operating lease liabilities 30 Other liabilities 16 Total liabilities 128 Net assets acquired 333 Goodwill $ 417
Schedule of Fair Value of Intangible Assets and the Related Weighted-average Useful Lives	The following table summarizes the fair value of intangible assets and the related weighted-average useful lives: Dollars in millions Fair Value Weighted Average Amortization Period (in years) Funded backlog $ 10 1 Customer relationships 280 13 Total intangible assets $ 290 13
Schedule of pro forma information	The following supplemental pro forma, combined financial information has been prepared from historical financial statements that have been adjusted to give effect to the acquisition of LinQuest as though it had been acquired on January 1, 2023. Pro forma adjustments were primarily related to the amortization of intangibles and interest on borrowings related to the acquisition. Accordingly, this supplemental pro forma financial information is presented for informational purposes only and is not necessarily indicative of what the actual results of operations of the combined company would have been had the acquisition occurred on January 1, 2023, nor is it indicative of future results of operations. Three Months Ended Nine Months Ended September 27, September 29, September 27, September 29, Dollars in millions 2024 2023 2024 2023 (Unaudited) Revenue $ 2,042 $ 1,894 $ 5,984 $ 5,581 Net income attributable to KBR $ 86 $ (34) 269 (326) Diluted earnings per share $ 0.65 $ (0.25) $ 2.01 $ (2.40)

Business Segment Information (N

Business Segment Information (Narrative) (Details)	9 Months Ended
Business Segment Information (Narrative) (Details)	Sep. 27, 2024 process_technology segment vertical
Segment Reporting Information [Line Items]
Core business segments, number	2
Non-core business segments, number	1
Sustainable Technology Solutions
Segment Reporting Information [Line Items]
Number of process technologies (over) \| process_technology	80
Number of primary areas \| vertical	4

Business Segment Information (S

Business Segment Information (Schedule of Operations by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 1,947	$ 1,770	$ 5,620	$ 5,226
Total operating income	173	147	520	301
Government Solutions
Segment Reporting Information [Line Items]
Total revenues	1,490	1,345	4,273	4,025
Total operating income	123	108	362	182
Sustainable Technology Solutions
Segment Reporting Information [Line Items]
Total revenues	457	425	1,347	1,201
Total operating income	95	84	277	243
Other
Segment Reporting Information [Line Items]
Total operating income	$ (45)	$ (45)	$ (119)	$ (124)

Revenue (Revenue by Geographic

Revenue (Revenue by Geographic Destination) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 1,947	$ 1,770	$ 5,620	$ 5,226
United States
Disaggregation of Revenue [Line Items]
Revenues	1,042	934	2,945	2,703
Europe
Disaggregation of Revenue [Line Items]
Revenues	468	431	1,394	1,389
Middle East
Disaggregation of Revenue [Line Items]
Revenues	178	136	531	380
Australia
Disaggregation of Revenue [Line Items]
Revenues	134	131	391	379
Africa
Disaggregation of Revenue [Line Items]
Revenues	47	49	146	124
Asia
Disaggregation of Revenue [Line Items]
Revenues	37	50	93	131
Other countries
Disaggregation of Revenue [Line Items]
Revenues	41	39	120	120
Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	1,490	1,345	4,273	4,025
Government Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenues	906	805	2,553	2,305
Government Solutions \| Europe
Disaggregation of Revenue [Line Items]
Revenues	400	366	1,183	1,200
Government Solutions \| Middle East
Disaggregation of Revenue [Line Items]
Revenues	38	36	111	102
Government Solutions \| Australia
Disaggregation of Revenue [Line Items]
Revenues	114	104	325	311
Government Solutions \| Africa
Disaggregation of Revenue [Line Items]
Revenues	17	16	50	51
Government Solutions \| Asia
Disaggregation of Revenue [Line Items]
Revenues	1	4	7	12
Government Solutions \| Other countries
Disaggregation of Revenue [Line Items]
Revenues	14	14	44	44
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Revenues	457	425	1,347	1,201
Sustainable Technology Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenues	136	129	392	398
Sustainable Technology Solutions \| Europe
Disaggregation of Revenue [Line Items]
Revenues	68	65	211	189
Sustainable Technology Solutions \| Middle East
Disaggregation of Revenue [Line Items]
Revenues	140	100	420	278
Sustainable Technology Solutions \| Australia
Disaggregation of Revenue [Line Items]
Revenues	20	27	66	68
Sustainable Technology Solutions \| Africa
Disaggregation of Revenue [Line Items]
Revenues	30	33	96	73
Sustainable Technology Solutions \| Asia
Disaggregation of Revenue [Line Items]
Revenues	36	46	86	119
Sustainable Technology Solutions \| Other countries
Disaggregation of Revenue [Line Items]
Revenues	27	25	76	76
Science & Space \| Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	308	294	897	860
Defense & Intel \| Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	458	397	1,272	1,143
Readiness & Sustainment \| Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	396	363	1,134	1,161
International \| Government Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 328	$ 291	$ 970	$ 861

Revenue (Revenue by Contract Ty

Revenue (Revenue by Contract Type) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,947	$ 1,770	$ 5,620	$ 5,226
Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	898	831	2,581	2,477
Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	563	507	1,624	1,526
Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	486	432	1,415	1,223
Government Solutions
Disaggregation of Revenue [Line Items]
Total revenue	1,490	1,345	4,273	4,025
Government Solutions \| Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	898	831	2,581	2,477
Government Solutions \| Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	281	254	789	788
Government Solutions \| Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	311	260	903	760
Sustainable Technology Solutions
Disaggregation of Revenue [Line Items]
Total revenue	457	425	1,347	1,201
Sustainable Technology Solutions \| Cost Reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Sustainable Technology Solutions \| Time-and-Materials
Disaggregation of Revenue [Line Items]
Total revenue	282	253	835	738
Sustainable Technology Solutions \| Fixed Price
Disaggregation of Revenue [Line Items]
Total revenue	$ 175	$ 172	$ 512	$ 463

Revenue (Performance Obligation

Revenue (Performance Obligation) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2024	Sep. 27, 2024	Sep. 29, 2023
Revenue from Contract with Customer [Abstract]
Revenue from performance obligations satisfied in previous periods	$ 24	$ 46	$ 8
Revenue, remaining performance obligation	$ 14,000	$ 14,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-09-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied, percentage	33%	33%
Revenue, remaining performance obligation, expected timing of satisfaction (year)	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-04
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied, percentage	40%	40%
Revenue, remaining performance obligation, expected timing of satisfaction (year)	4 years	4 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-09-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, expected to be satisfied, percentage	27%	27%
Revenue, remaining performance obligation, expected timing of satisfaction (year)

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Sep. 29, 2023
Revenue from Contract with Customer [Abstract]
Contract liability, revenue recognized	$ 256	$ 183

Revenue (Accounts Receivable) (

Revenue (Accounts Receivable) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Revenue from External Customer [Line Items]
Accounts receivable	$ 1,095	$ 981
Unbilled
Revenue from External Customer [Line Items]
Accounts receivable	587	519
Trade & other
Revenue from External Customer [Line Items]
Accounts receivable	$ 508	$ 462

Cash and Cash Equivalents (Deta

Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 462	$ 304
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	287	158
Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	28	14
Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	147	132
Short-term investments \| Aspire Defence Project
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	92	83
International
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	397	239
International \| Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	249	122
International \| Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	17	6
International \| Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	131	111
Domestic
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	65	65
Domestic \| Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	38	36
Domestic \| Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	11	8
Domestic \| Cash and cash equivalents held in consolidated joint ventures and Aspire Defence subcontracting entities
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 16	$ 21

Unapproved Change Orders and _3

Unapproved Change Orders and Claims Against Clients (Schedule of Unapproved Change Orders and Claims) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023
Unapproved Change Orders [Roll Forward]
Amounts included in project estimates-at-completion at beginning of fiscal year	$ 74	$ 48
Net increase in project estimates	53	11
Ending balance of amounts included in project estimates-at-completion	127	59
Amounts recognized over time based on progress	$ 112	$ 59

Equity Method Investments and_3

Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance			$ 206
Equity in earnings of unconsolidated affiliates	$ 27	$ 32	97	$ 78
Distributions of earnings of unconsolidated affiliates			(123)	(58)
Return of investments in equity method investment, net			(36)	(61)
Ending balance	188		188		$ 206
Return of (investments in) equity method joint ventures, net			36	61
Equity Method Investments
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Beginning balance			206	$ 188	188
Equity in earnings of unconsolidated affiliates			97		114
Distributions of earnings of unconsolidated affiliates			(131)		(63)
Payments from unconsolidated affiliates, net			(5)		(18)
Return of investments in equity method investment, net			(36)		(60)
Foreign currency translation adjustments			3		3
Other			54		42
Ending balance	$ 188		188		206
Return of (investments in) equity method joint ventures, net			36		60
Other			54		42
Equity Method Investments \| Subcontractor Settlement Agreement
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Return of investments in equity method investment, net			(36)		(61)
Other			55		47
Return of (investments in) equity method joint ventures, net			36		61
Other			$ 55		$ 47

Equity Method Investments and_4

Equity Method Investments and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Schedule of Equity Method Investments [Line Items]
Revenues	$ 1,947	$ 1,770	$ 5,620	$ 5,226
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Revenues	$ 190	$ 137	$ 534	$ 390

Equity Method Investments and_5

Equity Method Investments and Variable Interest Entities (Related Party Disclosures) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net of allowance for credit losses	$ 1,095	$ 981
Contract liabilities	381	359
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net of allowance for credit losses	96	103
Contract liabilities	$ 62	$ 89

Retirement Benefits (Narrative)

Retirement Benefits (Narrative) (Details) - Pension Plan $ in Millions	9 Months Ended
	Sep. 27, 2024 USD ($) plan
U.S
Defined Benefit Plan Disclosure [Line Items]
Number of frozen defined benefit plans	2
U.K.
Defined Benefit Plan Disclosure [Line Items]
Number of frozen defined benefit plans	1
Number of active defined benefit plans	1
Contributions by employer \| $	$ 28
Estimated future employer contributions in remainder of fiscal year \| $	$ 40
Germany
Defined Benefit Plan Disclosure [Line Items]
Number of frozen defined benefit plans	1

Retirement Benefits (Schedule o

Retirement Benefits (Schedule of Net Periodic Pension Benefit) (Details) - U.K. - Pension Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 15	$ 15	$ 45	$ 45
Expected return on plan assets	(28)	(26)	(84)	(76)
Amortization of prior service cost	1	1	1	1
Recognized actuarial loss	0	0	2	0
Net periodic pension benefit	$ (12)	$ (10)	$ (36)	$ (30)

Debt and Other Credit Facilit_3

Debt and Other Credit Facilities (Outstanding Debt Balances) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts	$ (26)	$ (19)
Total debt	2,606	1,832
Less: current portion	46	31
Total long-term debt, net of current portion	2,560	1,801
Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Long-term debt	1,054	595
Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Long-term debt	998	501
Senior Notes
Debt Instrument [Line Items]
Long-term debt	250	250
Revolver \| Revolver
Debt Instrument [Line Items]
Long-term debt	$ 330	$ 505

Debt and Other Credit Facilit_4

Debt and Other Credit Facilities (Senior Credit Facility) (Details) - USD ($)					9 Months Ended
	Sep. 27, 2024	Aug. 30, 2024	Aug. 14, 2024	Jan. 19, 2024	Sep. 27, 2024	Sep. 29, 2023	Feb. 07, 2024	Apr. 25, 2018
Line of Credit Facility [Line Items]
Borrowings on long-term debt					$ 574,000,000	$ 0
Cash repayments on revolver					63,000,000	$ 270,000,000
Term Loan B \| Secured Debt
Line of Credit Facility [Line Items]
Borrowings on long-term debt				$ 24,000,000
Repayments of secured debt				501,000,000
Repayments of secured debt					2,000,000
Quarterly principal payments	$ 3,000,000
Term Loan B \| Secured Debt \| SOFR
Line of Credit Facility [Line Items]
Rate			2%
Term Loan B \| Secured Debt \| Base Rate
Line of Credit Facility [Line Items]
Rate			1%
Term Loan A \| Secured Debt
Line of Credit Facility [Line Items]
Repayments of secured debt					79,000,000
Debt instrument, repaid, principal					$ 20,000,000
Debt instrument, covenant, interest coverage ratio							3
Term Loan A \| Secured Debt \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio through 2023							4.25
Debt instrument, covenant, leverage ratio through 2024 and thereafter							4
Term Loan A-1 \| Secured Debt \| Fiscal quarter ending March 31, 2022
Line of Credit Facility [Line Items]
Percentage of aggregate principal							0.625%
Term Loan A-1 \| Secured Debt \| Quarter ending April 3, 2026
Line of Credit Facility [Line Items]
Percentage of aggregate principal							1.25%
Term Loan A-3 \| Secured Debt \| Fiscal quarter ending March 31, 2022
Line of Credit Facility [Line Items]
Percentage of aggregate principal							0.625%
Term Loan A-3 \| Secured Debt \| Quarter ending April 3, 2026
Line of Credit Facility [Line Items]
Percentage of aggregate principal							1.25%
Term Loan A-2 \| Secured Debt
Line of Credit Facility [Line Items]
Aggregate principal amount			$ 550,000,000
Borrowings on long-term debt		$ 550,000,000
Debt instrument term			180 days
Term Loan A-2 \| Secured Debt \| Fiscal quarter ending March 31, 2022
Line of Credit Facility [Line Items]
Percentage of aggregate principal	0.625%				0.625%
Revolver \| Revolver
Line of Credit Facility [Line Items]
Revolving credit facility							$ 1,000,000,000	$ 1,000,000,000
Repayments of long-term lines of credit				475,000,000
Repurchase of convertible notes					$ 343,000,000
Cash repayments on revolver					$ 63,000,000
Revolver \| Term Loan B \| Secured Debt
Line of Credit Facility [Line Items]
Aggregate principal amount				$ 1,000,000,000

Debt and Other Credit Facilit_5

Debt and Other Credit Facilities (Schedule of Commitment Fees) (Details)	Feb. 07, 2024
Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Credit spread adjustment	0.0010
Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Credit spread adjustment	0.0010
Secured Debt \| SONIA \| Term Loan A-1
Debt Instrument [Line Items]
Credit spread adjustment	0.0012
Secured Debt \| SONIA \| Term Loan A-3
Debt Instrument [Line Items]
Credit spread adjustment	0.0012
Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Credit spread adjustment	0.0010
Revolver \| SONIA \| Revolver
Debt Instrument [Line Items]
Credit spread adjustment	0.0012
Greater than or equal to 4.25 to 1.00 \| Term Loan A-2
Debt Instrument [Line Items]
Commitment Fee	0.33%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| Term Loan A-1
Debt Instrument [Line Items]
Commitment Fee	0.33%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| Term Loan A-3
Debt Instrument [Line Items]
Commitment Fee	0.33%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Rate	2.25%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Rate	2.25%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-2
Debt Instrument [Line Items]
Rate	2.13%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-1
Debt Instrument [Line Items]
Rate	1.25%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-3
Debt Instrument [Line Items]
Rate	1.25%
Greater than or equal to 4.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-2
Debt Instrument [Line Items]
Rate	1.13%
Greater than or equal to 4.25 to 1.00 \| Revolver \| Revolver
Debt Instrument [Line Items]
Commitment Fee	0.33%
Greater than or equal to 4.25 to 1.00 \| Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Rate	2.25%
Greater than or equal to 4.25 to 1.00 \| Revolver \| Base Rate \| Revolver
Debt Instrument [Line Items]
Rate	1.25%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Term Loan A-2
Debt Instrument [Line Items]
Commitment Fee	0.30%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| Term Loan A-1
Debt Instrument [Line Items]
Commitment Fee	0.30%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| Term Loan A-3
Debt Instrument [Line Items]
Commitment Fee	0.30%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Rate	2%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Rate	2%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-2
Debt Instrument [Line Items]
Rate	1.88%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-1
Debt Instrument [Line Items]
Rate	1%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-3
Debt Instrument [Line Items]
Rate	1%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-2
Debt Instrument [Line Items]
Rate	0.88%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Revolver \| Revolver
Debt Instrument [Line Items]
Commitment Fee	0.30%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Rate	2%
Less than 4.25 to 1.00 but greater than or equal to 3.25 to 1.00 \| Revolver \| Base Rate \| Revolver
Debt Instrument [Line Items]
Rate	1%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Term Loan A-2
Debt Instrument [Line Items]
Commitment Fee	0.28%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| Term Loan A-1
Debt Instrument [Line Items]
Commitment Fee	0.28%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| Term Loan A-3
Debt Instrument [Line Items]
Commitment Fee	0.28%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Rate	1.75%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Rate	1.75%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-2
Debt Instrument [Line Items]
Rate	1.63%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-1
Debt Instrument [Line Items]
Rate	0.75%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-3
Debt Instrument [Line Items]
Rate	0.75%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-2
Debt Instrument [Line Items]
Rate	0.63%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Revolver \| Revolver
Debt Instrument [Line Items]
Commitment Fee	0.28%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Rate	1.75%
Less than 3.25 to 1.00 but greater than or equal to 2.25 to 1.00 \| Revolver \| Base Rate \| Revolver
Debt Instrument [Line Items]
Rate	0.75%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Term Loan A-2
Debt Instrument [Line Items]
Commitment Fee	0.25%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| Term Loan A-1
Debt Instrument [Line Items]
Commitment Fee	0.25%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| Term Loan A-3
Debt Instrument [Line Items]
Commitment Fee	0.25%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Rate	1.50%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Rate	1.50%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-2
Debt Instrument [Line Items]
Rate	1.38%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-1
Debt Instrument [Line Items]
Rate	0.50%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-3
Debt Instrument [Line Items]
Rate	0.50%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-2
Debt Instrument [Line Items]
Rate	0.38%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Revolver \| Revolver
Debt Instrument [Line Items]
Commitment Fee	0.25%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Rate	1.50%
Less than 2.25 to 1.00 but greater than or equal to 1.25 to 1.00 \| Revolver \| Base Rate \| Revolver
Debt Instrument [Line Items]
Rate	0.50%
Less than 1.25 to 1.00 \| Term Loan A-2
Debt Instrument [Line Items]
Commitment Fee	0.23%
Less than 1.25 to 1.00 \| Secured Debt \| Term Loan A-1
Debt Instrument [Line Items]
Commitment Fee	0.23%
Less than 1.25 to 1.00 \| Secured Debt \| Term Loan A-3
Debt Instrument [Line Items]
Commitment Fee	0.23%
Less than 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-1
Debt Instrument [Line Items]
Rate	1.25%
Less than 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-3
Debt Instrument [Line Items]
Rate	1.25%
Less than 1.25 to 1.00 \| Secured Debt \| SOFR \| Term Loan A-2
Debt Instrument [Line Items]
Rate	1.13%
Less than 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-1
Debt Instrument [Line Items]
Rate	0.25%
Less than 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-3
Debt Instrument [Line Items]
Rate	0.25%
Less than 1.25 to 1.00 \| Secured Debt \| Base Rate \| Term Loan A-2
Debt Instrument [Line Items]
Rate	0.13%
Less than 1.25 to 1.00 \| Revolver \| Revolver
Debt Instrument [Line Items]
Commitment Fee	0.23%
Less than 1.25 to 1.00 \| Revolver \| SOFR \| Revolver
Debt Instrument [Line Items]
Rate	1.25%
Less than 1.25 to 1.00 \| Revolver \| Base Rate \| Revolver
Debt Instrument [Line Items]
Rate	0.25%

Debt and Other Credit Facilit_6

Debt and Other Credit Facilities (Senior Notes) (Details) - Notes Due 2028 - Senior Notes	Sep. 30, 2020 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount	$ 250,000,000
Interest rate, stated percentage	4.75%
Change of control
Debt Instrument [Line Items]
Redemption price, percentage	101%

Debt and Other Credit Facilit_7

Debt and Other Credit Facilities (Letters of Credit, Surety Bonds and Guarantees) (Details) - USD ($)	Sep. 27, 2024	Feb. 07, 2024	Apr. 25, 2018
Letters of Credit Surety Bonds and Bank Guarantees
Debt Instrument [Line Items]
Letters of credit outstanding relate to joint venture operations	$ 84,000,000
Revolver \| Revolver
Debt Instrument [Line Items]
Revolving credit facility		$ 1,000,000,000	$ 1,000,000,000
Long-term line of credit	330,000,000
Letters of credit outstanding	14,000,000
Remaining borrowing capacity	856,000,000
Revolver \| Committed Line of Credit \| Revolver
Debt Instrument [Line Items]
Revolving credit facility	1,000,000,000
Revolver \| Uncommitted Line of Credit \| Revolver
Debt Instrument [Line Items]
Revolving credit facility	493,000,000
Letter of Credit \| Uncommitted Line of Credit \| Revolver
Debt Instrument [Line Items]
Letters of credit outstanding	$ 293,000,000

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	26%	(32.00%)
Deferred tax assets, valuation allowance	$ 147		$ 148
Income from foreign sources	200
Income from domestic sources	1,033
Liabilities for uncertain tax positions	$ 74		$ 74

U.S. Government Matters (Detail

U.S. Government Matters (Details) - USD ($) $ in Millions			1 Months Ended
U.S. Government Matters (Details) - USD ($) $ in Millions	Sep. 22, 2023	Jun. 12, 2023	Mar. 31, 2022	Sep. 27, 2024	Dec. 29, 2023
Reserve For Potentially Disallowable Costs Incurred Under Government Contracts
United States Government Contract Work [Line Items]
Accrued reserve for unallowable costs				$ 35	$ 45
First Kuwaiti Trading Company Arbitration
United States Government Contract Work [Line Items]
Damages awarded, value		$ 16
Claims in unpaid bonuses		$ 70	$ 100
First Kuwaiti Trading Company Arbitration \| Settled Litigation
United States Government Contract Work [Line Items]
Litigation settlement amount awarded from other party	$ 8

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,411	$ 1,629	$ 1,394	$ 1,632
Other comprehensive income (loss) adjustments before reclassifications			45	34
Amounts reclassified from AOCL			(15)	(13)
Other comprehensive income (loss), net of tax	26	(31)	30	21
Ending balance	1,514	1,565	1,514	1,565
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(911)	(830)	(915)	(882)
Other comprehensive income (loss), net of tax	26	(31)	30	21
Ending balance	(885)	(861)	(885)	(861)
Accumulated foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(300)	(352)
Other comprehensive income (loss) adjustments before reclassifications			39	5
Amounts reclassified from AOCL			0	0
Other comprehensive income (loss), net of tax			39	5
Ending balance	(261)	(347)	(261)	(347)
Accumulated pension liability adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(644)	(568)
Other comprehensive income (loss) adjustments before reclassifications			1	0
Amounts reclassified from AOCL			3	1
Other comprehensive income (loss), net of tax			4	1
Ending balance	(640)	(567)	(640)	(567)
Changes in fair value of derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			29	38
Other comprehensive income (loss) adjustments before reclassifications			5	29
Amounts reclassified from AOCL			(18)	(14)
Other comprehensive income (loss), net of tax			(13)	15
Ending balance	$ 16	$ 53	$ 16	$ 53

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss (Reclassification out of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Foreign currency hedge and interest rate swap settlements	$ (2)	$ 2	$ (10)	$ (1)
Tax expense	(32)	(23)	(107)	(69)
Net income (loss)	$ 102	$ (18)	303	(282)
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated pension liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost			(1)	(1)
Recognized actuarial loss			(2)	0
Net income (loss)			(3)	(1)
Reclassification out of Accumulated Other Comprehensive Income \| Changes in fair value for derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Foreign currency hedge and interest rate swap settlements			22	17
Tax expense			(4)	(3)
Net income (loss)			$ 18	$ 14

Share Repurchases (Narrative) (

Share Repurchases (Narrative) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Feb. 19, 2024
Equity [Abstract]
Additional amount authorized for repurchase program		$ 174
Stock repurchase program, authorized amount		$ 500
Remaining authorized repurchase amount	$ 346

Share Repurchases - (Share Repu

Share Repurchases - (Share Repurchases Activity Under These Programs) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Equity, Class of Treasury Stock [Line Items]
Number of shares (in shares)	137,303	4,244	2,671,069	2,441,135
Average price per share (in usd per share)	$ 64.05	$ 61.47	$ 62.47	$ 56.04
Value of common stock repurchases	$ 9	$ 0	$ 167	$ 137
Number of shares (in shares)	20,237	4,244	215,648	218,842
Average price per share (in usd per share)	$ 64.10	$ 61.47	$ 59.73	$ 54.07
Value of common stock repurchases	$ 1	$ 0	$ 13	$ 12
Share Repurchase Program 2014
Equity, Class of Treasury Stock [Line Items]
Number of shares (in shares)	117,066	0	2,455,421	2,222,293
Average price per share (in usd per share)	$ 64.04	$ 0	$ 62.71	$ 56.23
Value of common stock repurchases	$ 8	$ 0	$ 154	$ 125

Income (loss) per Share (Schedu

Income (loss) per Share (Schedule Of Basic And Diluted Weighted Average Common Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Earnings Per Share [Abstract]
Net Income (loss) attributable to KBR	$ 100	$ (21)	$ 299	$ (286)
Less earnings allocable to participating securities	0	0	(1)	0
Basic net income (loss) attributable to KBR	100	(21)	298	(286)
Diluted net income (loss) attributable to KBR	$ 100	$ (21)	$ 298	$ (286)
Basic weighted average common shares outstanding (in shares)	133	135	134	136
Diluted weighted average common shares outstanding (in shares)	133	135	134	136
Basic (in usd per share)	$ 0.75	$ (0.16)	$ 2.22	$ (2.10)
Diluted (in usd per share)	$ 0.75	$ (0.16)	$ 2.22	$ (2.10)

Income (loss) per Share (Narrat

Income (loss) per Share (Narrative) (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Stock options and restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	0.2	1.3	0.2	1.4
Convertible debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)				5.3
Warrant
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		9.9		12.1

Fair Value of Financial Instr_3

Fair Value of Financial Instruments and Risk Management (Carrying Value and Fair Value) (Details) - USD ($) $ in Millions	Sep. 27, 2024	Dec. 29, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability - Warrants		$ 33
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability - Warrants	$ 0	33
Carrying Value \| Secured Debt \| Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	1,054	595
Carrying Value \| Secured Debt \| Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	998	501
Carrying Value \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	250	250
Carrying Value \| Revolver \| Revolver
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	330	505
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability - Warrants	0	33
Fair Value \| Secured Debt \| Term Loan A
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	1,054	595
Fair Value \| Secured Debt \| Term Loan B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	999	503
Fair Value \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	241	231
Fair Value \| Revolver \| Revolver
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, fair value disclosure	$ 330	$ 505

Fair Value of Financial Instr_4

Fair Value of Financial Instruments and Risk Management (Carrying Value and Fair Value) (Narrative) (Details) $ in Millions	Dec. 29, 2023 USD ($)
Fair Value Disclosures [Abstract]
Warrant derivative liability	$ 33

Fair Value of Financial Instr_5

Fair Value of Financial Instruments and Risk Management (Foreign Currency Risk) (Details)	9 Months Ended
	Sep. 27, 2024 USD ($)
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Maximum length of time hedged in balance sheet hedge	30 days
Balance Sheet Hedge
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Derivative, notional amount	$ 52,000,000

Fair Value of Financial Instr_6

Fair Value of Financial Instruments and Risk Management (Schedule of Changes in Fair Value of Balance Sheet Hedges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Fair Value Disclosures [Abstract]
Balance Sheet Hedges - Fair Value	$ (1)	$ (1)	$ (2)	$ 0
Balance Sheet Position - Remeasurement	(2)	0	(3)	(4)
Net gain (loss)	$ (3)	$ (1)	$ (5)	$ (4)

Fair Value of Financial Instr_7

Fair Value of Financial Instruments and Risk Management (Interest Rate Risk) (Details)	Sep. 27, 2024 USD ($)	Sep. 27, 2024 GBP (£)
March 2020 Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 400,000,000
Fixed interest rate	0.89%	0.89%
September 2022 Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 350,000,000
Fixed interest rate	3.43%	3.43%
March 2023 Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 205,000,000
Fixed interest rate	3.61%	3.61%
March 2023 Amortizing Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount \| £		£ 111,000,000
Fixed interest rate	3.81%	3.81%
September 2024 Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 200,000,000
Fixed interest rate	3.27%	3.27%

Fair Value of Financial Instr_8

Fair Value of Financial Instruments and Risk Management (Interest Rate Risk) (Narrative) (Details) - Interest Rate Swap - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 27, 2024	Dec. 29, 2023
Derivatives, Fair Value [Line Items]
Fair value of interest rate swap assets (liabilities)	$ 21	$ 36
Unrealized gain on derivatives	21	36
Other Current Assets
Derivatives, Fair Value [Line Items]
Fair value of interest rate swap assets (liabilities)	17	24
Other Assets
Derivatives, Fair Value [Line Items]
Fair value of interest rate swap assets (liabilities)	10	18
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Fair value of interest rate swap assets (liabilities)	$ (6)	$ (6)

Fair Value of Financial Instr_9

Fair Value of Financial Instruments and Risk Management (Sale of Receivables) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023
Fair Value Disclosures [Abstract]
Sale of receivables	$ 2,324	$ 2,250
Receivables sold	$ 2,290

Fair Value of Financial Inst_10

Fair Value of Financial Instruments and Risk Management (Sale of Receivables - Third-party Financial Institutions) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023
Transfer of Financial Assets Accounted for as Sales [Roll Forward]
Beginning balance	$ 135	$ 134
Sale of receivables	2,324	2,250
Settlement of receivables	(2,318)	(2,243)
Cash collected, not yet remitted	(39)	0
Outstanding balances sold to financial institutions	$ 102	$ 141

Fair Value of Financial Inst_11

Fair Value of Financial Instruments and Risk Management (Other Investments) (Details) - Mura $ in Millions	9 Months Ended
	Sep. 27, 2024 USD ($)	Dec. 29, 2023 USD ($)
Equity Securities without Readily Determinable Fair Value [Line Items]
Ownership percentage	0.17
Carrying value of investment	$ 135	$ 128

Acquisitions (Narrative) (Detai

Acquisitions (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Millions	Aug. 30, 2024	Sep. 27, 2024	Sep. 27, 2024	Sep. 29, 2023	Dec. 29, 2023
Business Acquisition [Line Items]
Cash consideration paid			$ 739	$ 0
Issuance of secured debt			574	0
Proceeds from line of credit			343	$ 430
Goodwill		$ 2,553	2,553		$ 2,109
Revolver \| Revolver
Business Acquisition [Line Items]
Proceeds from line of credit	$ 50
Term Loan A-2 \| Secured Debt
Business Acquisition [Line Items]
Issuance of secured debt	550
LinQuest Corporation
Business Acquisition [Line Items]
Cash consideration paid	739
Acquisition and integration related costs		3	3
Goodwill	$ 417
Revenues		41	41
Gross profit		$ 4	$ 4

Acquisitions (Fair Value Of The

Acquisitions (Fair Value Of The Assets Acquired And Liabilities) (Details) - USD ($) $ in Millions	Aug. 30, 2024	Sep. 27, 2024	Dec. 29, 2023
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		$ 2,553	$ 2,109
LinQuest Corporation
Business Acquisition [Line Items]
Fair value of total consideration paid	$ 750
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and equivalents	11
Accounts receivable	98
Contract assets	2
Other current assets	4
Total current assets	115
Property, plant, and equipment	15
Operating lease right-of-use assets	37
Intangible assets	290
Equity in and advances to unconsolidated affiliates	1
Deferred income taxes	2
Other assets	1
Total assets	461
Accounts payable	35
Contract liabilities	7
Accrued salaries, wages and benefits	32
Other current liabilities	8
Total current liabilities	82
Operating lease liabilities	30
Other liabilities	16
Total liabilities	128
Net assets acquired	333
Goodwill	$ 417

Acquisitions (Fair Value Of Int

Acquisitions (Fair Value Of Intangible Assets) (Details) $ in Millions	Aug. 30, 2024 USD ($)
Business Acquisition [Line Items]
Fair Value	$ 290
Weighted Average Amortization Period (in years)	13 years
Funded backlog
Business Acquisition [Line Items]
Fair Value	$ 10
Weighted Average Amortization Period (in years)	1 year
Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 280
Weighted Average Amortization Period (in years)	13 years

Acquisitions (Pro Forma Informa

Acquisitions (Pro Forma Information) (Details) - LinQuest Corporation - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Business Acquisition [Line Items]
Revenue	$ 2,042	$ 1,894	$ 5,984	$ 5,581
Net income attributable to KBR	$ 86	$ (34)	$ 269	$ (326)
Diluted earnings per share (in usd per share)	$ 0.65	$ (0.25)	$ 2.01	$ (2.40)