DT Midstream (DTM) 10-K16 Feb 242023 FY Annual reportFinancial data

Company Profile

Cover

Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2023	Feb. 08, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40392
Entity Registrant Name	DT Midstream, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-2663964
Entity Address, Address Line One	500 Woodward Ave., Suite 2900
Entity Address, City or Town	Detroit
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48226-1279
City Area Code	313
Local Phone Number	402-8532
Title of 12(b) Security	Common stock, par value $0.01
Trading Symbol	DTM
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 4.8
Entity Common Stock, Shares Outstanding		96,979,556
Documents Incorporated by Reference	Certain information in DT Midstream's definitive Proxy Statement for our 2024 Annual Meeting of Common Shareholders to be held May 10, 2024, which will be filed with the Securities and Exchange Commission pursuant to Regulation 14A, not later than 120 days after the end of the registrant’s fiscal year covered by this report on Form 10-K, is incorporated herein by reference to Part III (Items 10, 11, 12, 13, and 14) of this Form 10-K.
Entity Central Index Key	0001842022
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2023
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Detroit, Michigan

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Operating revenues	$ 922	$ 920	$ 840
Operating Expenses
Operation and maintenance	245	267	231
Depreciation and amortization	182	170	166
Taxes other than income	28	28	24
Asset (gains) losses and impairments, net	(4)	(23)	17
Operating Income	471	478	402
Other (Income) and Deductions
Interest expense	150	137	112
Interest income	(1)	(3)	(4)
Earnings from equity method investees	(177)	(150)	(126)
Loss from financing activities	0	13	0
Other (income) and expense	(1)	(1)	(2)
Income Before Income Taxes	500	482	422
Income Tax Expense	104	100	104
Net Income	396	382	318
Less: Net Income Attributable to Noncontrolling Interests	12	12	11
Net Income Attributable to DT Midstream	$ 384	$ 370	$ 307
Basic Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.97	$ 3.83	$ 3.17
Diluted Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.94	$ 3.81	$ 3.16
Weighted Average Common Shares Outstanding
Basic (in shares)	96.9	96.7	96.7
Diluted (in shares)	97.5	97.2	96.9

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income	$ 396	$ 382	$ 318
Foreign currency translation and unrealized gain on derivatives, net of tax	2	0	1
Other comprehensive income	2	0	1
Comprehensive income	398	382	319
Less: Comprehensive income attributable to noncontrolling interests	12	12	11
Comprehensive Income Attributable to DT Midstream	$ 386	$ 370	$ 308

Consolidated Statements of Fina

Consolidated Statements of Financial Position - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 56	$ 61
Accounts receivable (net of $— allowance for expected credit loss for each period end)	154	161
Deferred property taxes	31	22
Taxes receivable	15	0
Prepaid expenses and other	16	18
Total Current Assets	272	262
Investments
Investments in equity method investees	1,762	2,200
Property
Property, plant, and equipment	5,282	4,534
Accumulated depreciation	(848)	(728)
Net Property, plant, and equipment	4,434	3,806
Other Assets
Goodwill	473	473
Long-term notes receivable — related party	4	4
Operating lease right-of-use assets	38	31
Intangible assets, net	1,968	2,025
Other	31	32
Total Other Assets	2,514	2,565
Total Assets	8,982	8,833
Current Liabilities
Accounts payable	94	119
Short-term borrowings	165	330
Operating lease liabilities	13	16
Dividends payable	67	62
Interest payable	10	10
Property taxes payable	34	29
Accrued compensation	18	20
Contract liabilities	18	4
Other	15	24
Total Current Liabilities	434	614
Long-Term Debt, net	3,065	3,059
Other Liabilities
Deferred income taxes	1,031	923
Operating lease liabilities	27	19
Contract liabilities	111	28
Other	34	36
Total Other Liabilities	1,203	1,006
Total Liabilities	4,702	4,679
Commitments and Contingencies (Note 12)
Stockholders' Equity
Preferred stock ($0.01 par value, 50,000,000 shares authorized, and no shares issued or outstanding as of December 31, 2023 and 2022)	0	0
Common stock ($0.01 par value, 550,000,000 shares authorized, and 96,971,021 and 96,754,549 shares issued and outstanding as of December 31, 2023 and 2022, respectively)	1	1
Additional paid-in capital	3,485	3,469
Retained earnings	661	547
Accumulated other comprehensive income (loss)	(8)	(10)
Total DT Midstream Equity	4,139	4,007
Noncontrolling interests	141	147
Total Equity	4,280	4,154
Total Liabilities and Equity	$ 8,982	$ 8,833

Consolidated Statements of Fi_2

Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current Assets
Allowance for expected credit loss	$ 0	$ 0
Stockholders' Equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	550,000,000	550,000,000
Common stock, shares issued (in shares)	96,971,021	96,754,549
Common stock, shares outstanding (in shares)	96,971,021	96,754,549

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net Income	$ 396	$ 382	$ 318
Adjustments to reconcile Net Income to Net cash and cash equivalents from operating activities:
Depreciation and amortization	182	170	166
Stock-based compensation	20	17	12
Amortization of operating lease right-of-use assets	18	19	18
Deferred income taxes	110	70	104
Earnings from equity method investees	(177)	(150)	(126)
Dividends from equity method investees	196	181	129
Asset (gains) losses and impairments, net	0	(17)	17
Loss from financing activities	0	13	0
Changes in assets and liabilities:
Accounts receivable, net	7	8	(43)
Accounts payable — third party	(5)	7	4
Accounts payable — related party	0	0	(10)
Contract liabilities	97	3	6
Other current and noncurrent assets and liabilities	(46)	22	(23)
Other investing activities	1	2	2
Net cash and cash equivalents from operating activities	798	725	572
Investing Activities
Plant and equipment expenditures	(772)	(338)	(140)
Proceeds from sale of notes receivable	0	22	0
Distributions from equity method investees	427	17	9
Contributions to equity method investees	(7)	(5)	(11)
Acquisition of additional interest in equity method investee	0	(552)	0
Notes receivable repaid by DTE Energy	0	0	263
Net cash and cash equivalents from (used for) investing activities	(351)	(854)	123
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	0	591	3,047
Repayment of long-term debt	0	(596)	(5)
Repayment of borrowings from DTE Energy	0	0	(3,175)
Borrowings under the Revolving Credit Facility	540	370	25
Repayment of borrowings under the Revolving Credit Facility	(705)	(40)	(25)
Payment of Revolving Credit Facility issuance costs	0	(3)	(7)
Repurchase of common stock	0	(3)	0
Distributions to noncontrolling interests	(18)	(14)	(16)
Dividends paid on common stock	(263)	(244)	(58)
Dividend to DTE Energy	0	0	(501)
Contributions from DTE Energy	0	0	110
Other financing activities	(6)	(3)	0
Net cash and cash equivalents from (used for) financing activities	(452)	58	(605)
Net Increase (Decrease) in Cash and Cash Equivalents	(5)	(71)	90
Cash and Cash Equivalents at Beginning of Period	61	132	42
Cash and Cash Equivalents at End of Period	56	61	132
Supplemental disclosure of cash information
Interest, net of interest capitalized	140	125	103
Income taxes	22	24	3
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable and other accruals	$ 80	$ 99	$ 10

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity/Member's Equity - USD ($) $ in Millions	Total		Related Party		Common Stock		Common Stock Related Party	[2]	Additional Paid-In Capital	Retained Earnings	Retained Earnings Related Party	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020					0
Beginning balance at Dec. 31, 2020	$ 4,228				$ 0				$ 3,333	$ 751		$ (11)	$ 155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	318									307			11
Issuance of common shares (in shares)					1,000	[1]	96,731,000
Issuance of common shares	0	[1]	$ 1	[2]			$ 1
Dividends	(116)		$ (501)							(116)	$ (501)
Distributions to noncontrolling interests	(16)												(16)
Stock-based compensation (in shares)					2,000
Stock-based compensation	8								8
Taxes and other adjustments	98								109	(10)			(1)
Other comprehensive income, net of tax	1											1
Ending balance (in shares) at Dec. 31, 2021					96,734,000
Ending balance at Dec. 31, 2021	$ 4,021				$ 1				3,450	431		(10)	149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (in dollars per share)	$ 0.01
Net Income	$ 382									370			12
Dividends	(248)									(248)
Distributions to noncontrolling interests	(14)												(14)
Stock-based compensation (in shares)					78,000
Stock-based compensation	15								17	(2)
Taxes and other adjustments	1								2	(1)
Repurchase of common stock (in shares)					(57,000)
Repurchase of common stock	(3)									(3)
Other comprehensive income, net of tax	$ 0
Ending balance (in shares) at Dec. 31, 2022	96,754,549				96,755,000
Ending balance at Dec. 31, 2022	$ 4,154				$ 1				3,469	547		(10)	147
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (in dollars per share)	$ 0.01
Net Income	$ 396									384			12
Dividends	(268)									(268)
Distributions to noncontrolling interests	(18)												(18)
Stock-based compensation (in shares)					216,000
Stock-based compensation	14								16	(2)
Other comprehensive income, net of tax	$ 2											2
Ending balance (in shares) at Dec. 31, 2023	96,971,021				96,971,000
Ending balance at Dec. 31, 2023	$ 4,280				$ 1				$ 3,485	$ 661		$ (8)	$ 141
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (in dollars per share)	$ 0.01

[1] Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC. Issuance of common shares to DTE Energy in anticipation of the Separation.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity/Member's Equity (Parenthetical) - $ / shares	3 Months Ended										12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.69	$ 0.69	$ 0.69	$ 0.69	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 0.60	$ 0.60	$ 1.20

Description of the Business and

Description of the Business and Basis of Presentation	12 Months Ended
Description of the Business and Basis of Presentation	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business and Basis of Presentation	DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION Description of the Business DT Midstream is an owner, operator, and developer of an integrated portfolio of natural gas midstream assets. We provide multiple, integrated natural gas services to customers through two segments: (i) Pipeline, which includes interstate pipelines, intrastate pipelines, storage systems, lateral pipelines including related treatment plants and compression and surface facilities, and (ii) Gathering, which includes gathering systems, related treatment plants, and compression and surface facilities. Our Pipeline segment also includes joint venture interests in equity method investees which own and operate interstate pipelines that connect to our wholly owned assets. Our core assets strategically connect key demand centers in the Midwestern U.S., Eastern Canada and Northeastern U.S. regions to the premium production areas of the Marcellus/Utica natural gas formation in the Appalachian Basin, and connect key demand centers and LNG export terminals in the Gulf Coast region to premium production areas of the Haynesville natural gas formation. In connection with the Separation from DTE Energy, on January 13, 2021, DTE Gas Enterprises, LLC, and its consolidated subsidiaries converted into a Delaware corporation pursuant to a statutory conversion and changed its name to DT Midstream, Inc. ("DT Midstream"). At the conversion, DT Midstream issued 1,000 shares of common stock at $0.01 par value to its parent, a subsidiary of DTE Energy. As DT Midstream was a single member LLC as of December 31, 2020, and a corporation with stockholders' equity as of December 31, 2023, 2022 and 2021, Consolidated Statements of Changes in Stockholders' Equity/Member's Equity are presented as of December 31, 2023, 2022, and 2021. In June 2021, the DT Midstream Board of Directors authorized the issuance of an additional 96,731,466 common shares in anticipation of the Separation, for a total of 96,732,466 common shares issued and outstanding. DT Midstream is authorized to issue 50,000,000 shares of preferred stock at $0.01 par value. No preferred stock was issued or outstanding as of December 31, 2023 and 2022. On July 1, 2021, DTE Energy completed the Separation through the distribution of 96,732,466 shares of DT Midstream common stock to DTE Energy shareholders. Following the Separation on July 1, 2021, DT Midstream became an independent public company listed under the symbol "DTM" on the NYSE. DTE Energy did not retain ownership in DT Midstream. Basis of Presentation The Consolidated Financial Statements and Notes to Consolidated Financial Statements as of and for the periods presented subsequent to July 1, 2021, the date of the Separation, reflect the consolidated financial position, results of operations and cash flows for DT Midstream as an independent company. Prior to the Separation, we operated as a consolidated entity of DTE Energy and not as a standalone company. For the periods prior to the Separation, the Consolidated Financial Statements and Notes to Consolidated Financial Statements were prepared on a carve-out basis using the consolidated financial statements and accounting records of DTE Energy. The carve-out basis financial statements represent our historical financial position, results of operations, and cash flows as they were historically managed in accordance with GAAP and reflect significant assumptions and allocations. The carve-out financial statements may not include all expenses that would have been incurred had we existed as a standalone entity. GAAP requires management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from our estimates. We believe the assumptions underlying these financial statements are reasonable. Cash Management Our sources of liquidity include cash generated from operations and available borrowings under our Revolving Credit Facility. Prior to the Separation, our sources of liquidity included cash generated from operations and loans obtained through DTE Energy’s corporate-wide cash management program, including a working capital loan agreement. Cash was managed centrally, with certain net earnings reinvested in, and working capital requirements met from, existing liquid funds. Effective July 1, 2021, we no longer participated in the cash management program and the working capital loan was terminated. Principles of Consolidation We consolidate all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. When we do not influence the operating policies of an investee, the equity investment is measured at fair value, if readily determinable, or if not readily determinable, at cost less impairment, if applicable. We eliminate all intercompany balances and transactions. We evaluate whether an entity is a VIE whenever reconsideration events occur. We consolidate VIEs for which we are the primary beneficiary. If we are not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. We perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed. We own an 85% interest in the Stonewall VIE and are the primary beneficiary, therefore Stonewall is consolidated. We own a 50% interest in the South Romeo VIE and are the primary beneficiary, therefore South Romeo is consolidated. The following table summarizes the major line items in the Consolidated Statements of Financial Position for consolidated VIEs as of December 31, 2023 and 2022. All assets and liabilities of a consolidated VIE are included in the table when it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. The assets and liabilities of consolidated VIEs that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIEs' obligations have been excluded from the table below. December 31, 2023 2022 (millions) ASSETS (a) Cash $ 13 $ 27 Accounts receivable 10 9 Other current assets 2 3 Intangible assets, net 483 498 Property, plant and equipment, net 391 403 Goodwill 25 25 $ 924 $ 965 LIABILITIES (a) Accounts payable and other current liabilities $ 4 $ 4 Other noncurrent liabilities 3 4 $ 7 $ 8 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities. We had a variable interest in an investment in certain assets in the Utica Shale region that was accounted for as a Note receivable — third party. We did not have an ownership interest in the entity and were not the primary beneficiary. This investment was sold during the second quarter 2022. See Note 2, "Significant Accounting Policies – Financing Receivables " to the Consolidated Financial Statements for additional discussion. Related Parties Transactions between DT Midstream and DTE Energy prior to the Separation, as well as transactions between us and our equity method investees, have been presented as related party transactions in the accompanying Consolidated Financial Statements. See Note 15, "Related Party Transactions" to the Consolidated Financial Statements. Equity Method Investments Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. Under the equity method of accounting, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and our share of the investee's earnings or losses, which are recorded as earnings from equity method investees on the Consolidated Statements of Operations. Our equity method investments are periodically evaluated for certain factors that may be indicative of other-than-temporary impairment. As of December 31, 2023 and 2022, our carrying amounts of investments in equity method investees exceeded our share of the underlying equity in the net assets of the investees by $352 million and $368 million, respectively. The difference will be amortized over the life of the underlying assets. As of December 31, 2023 and 2022, our consolidated retained earnings balance includes undistributed earnings from equity method investments of zero and $43 million, respectively. We use the cumulative earnings approach to classify proceeds received from equity method investees as dividends or distributions on the Consolidated Statements of Cash Flows. Equity method investees are described below: Investments As of % Owned As of December 31, December 31, Equity Method Investee 2023 2022 2023 2022 (millions) NEXUS $ 900 $ 1,313 50% 50% Vector 135 135 40% 40% Millennium 727 752 52.5% 52.5% Total investments in equity method investees $ 1,762 $ 2,200 In May 2023, NEXUS closed on the sale of $750 million of senior unsecured notes with a weighted-average coupon rate of 5.52%. We received a distribution from NEXUS of $371 million, net of fees and expenses, which reduced our investment balance. We used the proceeds from the distribution to repay borrowings outstanding under our Revolving Credit Facility. In October 2022, DT Midstream closed on the $552 million purchase of an additional 26.25% ownership interest in Millennium from National Grid. The transaction was financed with cash on hand and available capacity under the Company's Revolving Credit Facility. The purchase constituted National Grid's full ownership interest in Millennium and brought our total ownership interest in Millennium to 52.5%. We account for our ownership interest in Millennium under the equity method of accounting. Millennium is not a VIE and we do not have a controlling interest due to shared control with our partner over all of Millennium's significant business activities. Our carrying amount of our Millennium investment exceeded our share of the underlying equity in the net assets of Millennium by $343 million on the acquisition date. The following tables present summarized financial information of our non-consolidated equity method investees. The amounts included below represent 100% of the results of continuing operations of such entities, including the portion owned by other parties. Summarized balance sheet data is as follows: December 31, 2023 2022 (millions) Current assets $ 159 $ 198 Noncurrent assets 4,057 4,160 Current liabilities 208 206 Noncurrent liabilities $ 1,177 $ 476 Summarized income statement data is as follows: Year Ended December 31, 2023 2022 2021 (millions) Operating revenues $ 823 $ 800 $ 738 Operating expenses 377 396 371 Net Income $ 392 $ 372 $ 333

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
Significant Accounting Policies	Dec. 31, 2023
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES Cash and Cash Equivalents Cash and cash equivalents include cash in banks and highly liquid money market investments with remaining maturities of three months or less, when purchased. Cash equivalents are stated at cost, which approximates fair value. Financing Receivables Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value. We regularly monitor the credit quality of our financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. We have three internal grades of credit quality, with internal grade 1 as the lowest risk and internal grade 3 as the highest risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2023. As of December 31, 2023, the Notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2023. Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. We cease accruing interest income (nonaccrual status) and may either write off or establish an allowance for expected credit loss for the note receivable when it is expected that all contractual principal or interest amounts due will not be collected. In determining an allowance for expected credit losses for or the write off of notes receivable, we consider the historical payment experience and other factors that are expected to have a specific impact on collection, including existing and future economic conditions. Cash receipts for notes receivable on nonaccrual status that do not bring the account contractually current are first applied to contractually owed past due interest, with any remainder applied to principal. Recognition of interest income is generally resumed when the note receivable becomes contractually current. We had an investment in certain assets in the Utica Shale region which was accounted for as a note receivable — third party. In the second quarter 2021, we assessed the note receivable for expected loss and recorded a $19 million loss on the note receivable to Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. Additionally, we ceased accruing interest on the note receivable balance and reclassified the note to an Internal grade 3 receivable. Subsequently, as cash payments were received, a portion was recognized as interest income. A third party purchased our investment in certain assets in the Utica Shale region based on significantly improved commodity pricing during the second quarter 2022 for proceeds of $22 million. This resulted in a gain of $17 million recorded in Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. We maintain no continuing involvement with the note receivable. For trade accounts receivable, the customer allowance for expected credit loss is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, historical loss rates, customer trends and other relevant factors that may affect our ability to collect are also considered. Receivables are written off on a specific identification basis and determined based on the particular circumstances of the associated receivable. Uncollectible expense (recovery) was zero for each of the years ended December 31, 2023, 2022 and 2021. Our collections on accounts receivable from customers are current, and no material rate of historical loss was noted, which resulted in no allowance for expected credit loss as of December 31, 2023 or 2022. The following table presents a roll-forward of the activity for the notes receivables' allowance for expected credit loss. The balance, if any, is shown as a deduction from the notes receivables' balance in the Consolidated Statements of Financial Position. 2023 2022 2021 Allowance for expected credit loss- Notes Receivable (millions) Balance as of January 1 $ — $ — $ — Additions: Charged to costs, expenses, and other accounts — — 19 Deductions: Current period provision and write-offs charged against allowance — — (19) Balance as of December 31 $ — $ — $ — Property, Plant, and Equipment Property is stated at cost and includes construction-related labor, materials, and overhead. Expenditures for maintenance and repairs are charged to expense when incurred. Property, plant and equipment is depreciated over its estimated useful life using the straight-line method. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements. Intangible Assets Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements. Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. If the carrying amount of the asset exceeds the expected undiscounted future cash flows generated by the asset, an impairment loss is recognized resulting in the asset being written down to its estimated fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell. Operation and Maintenance Operation and maintenance is primarily comprised of costs for labor and employee benefits, outside services, materials, compression, purchased natural gas, operating lease costs, office costs, and other operating and maintenance costs. For the year ended December 31, 2021, general corporate expense allocations from DTE Energy of $32 million, including $20 million of Separation-related transaction costs for legal, accounting, auditing and other professional services DTE Energy incurred for the benefit of DT Midstream, were also included in operation and maintenance. Effective July 1, 2021, with the completion of the Separation, we no longer received corporate allocations from DTE Energy. Depreciation and Amortization Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses. Other Accounting Policies Footnote Title Note 4 Revenue Note 7 Income Taxes Note 9 Fair Value Note 11 Leases

New Accounting Pronouncements

New Accounting Pronouncements	12 Months Ended
New Accounting Pronouncements	Dec. 31, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS Recently Issued Pronouncements In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures . The amendments improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and interim disclosure requirements. The amendments are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our Consolidated Financial Statements. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The amendments improve transparency of income tax disclosure requirements, primarily through enhanced disclosures of rate reconciliation and income taxes paid. The amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our Consolidated Financial Statements.

Revenue

Revenue	12 Months Ended
Revenue	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Significant Accounting Policy – Revenue Pipeline revenues consist of services related to the gathering, transportation and/or storage of natural gas. Gathering revenues consist of services related to the gathering, processing, and/or treating of natural gas. Revenue is measured based upon the pricing or consideration for such services specified in the contract with a customer. Consideration may consist of both fixed components including fixed demand charges and fixed deficiency fee rates for MVCs, and variable components including fixed rates for the actual volumes flowed under interruptible services and other associated fees. Our contracts with customers generally contain a single performance obligation, which is a promise to deliver either a distinct service or a series of distinct services to the customer. When multiple performance obligations exist, the contract consideration is allocated between the performance obligations based on the relative standalone selling price, which is determined by prices charged to customers or the adjusted market assessment approach. The adjusted market assessment approach involves evaluating the market in which we sell services and estimating the price that a customer in that market would be willing to pay. Revenue is recognized when performance obligations are satisfied by delivering a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the service provided, revenue is recognized over time. Alternatively, if it is determined that the criteria for recognition of revenue over time is not met, the revenue is considered to be recognized at a point in time. Our revenues, including estimated unbilled amounts, are generally recognized over time as actual services are provided, or ratably over time when providing a stand-ready service. Unbilled amounts are generally determined using preliminary meter data volumes and contracted pricing, and typically result in minor adjustments. Generally, uncertainties in the variable consideration components are resolved and revenue amounts are known at the time of recognition. We have determined that the above methods represent a faithful depiction of delivering a service to the customer. Revenues are typically billed and consideration received monthly, however, certain deficiency fees related to MVCs are billed quarterly or annually. Disaggregation of Revenue The following is a summary of revenues disaggregated by segment: Year Ended December 31, 2023 2022 2021 (millions) Pipeline (a) $ 377 $ 339 $ 307 Gathering 545 581 534 Elimination of Inter-segment Revenue — — (1) Total operating revenues $ 922 $ 920 $ 840 __________________________________ (a) Includes revenues outside the scope of ASC 606 primarily related to contracts accounted for as leases of $7 million, $10 million and $9 million for the years ended December 31, 2023, 2022 and 2021, respectively. Nature of Services We primarily provide two types of revenue services: firm service and interruptible service. Firm service revenue contracts provide for fixed revenue commitments regardless of actual volumes of natural gas that flow, which leads to more stable operating performance, revenues and cash flows and limits our exposure to natural gas price fluctuations. Firm service revenue contracts are typically long-term and structured using fixed demand charges or MVCs with fixed deficiency fee rates. Contracts structured using fixed demand charges contain a performance obligation of a stand-ready series of distinct services that are substantially the same with the same pattern of transfer to the customer, therefore revenue is recognized ratably over time. Contracts structured using MVCs with fixed deficiency fee rates require customers to transport or store a minimum volume of natural gas over a specified time period. If a customer fails to meet its MVCs for the specified time period, the contract consideration includes a fixed rate for the actual volumes gathered, transported or stored, and a deficiency fee for the shortfall between the MVCs and the actual volumes gathered, transported, or stored. If a customer exceeds its MVC for the specified time period, the contract consideration is based on fixed rates for the actual volumes gathered, transported, or stored. The contract consideration is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the service obligation. Revenues are generally recognized over time based on the output measure of natural gas volumes gathered, transported, or stored, with the recognition of the deficiency fee revenue in the period when it is known the customer cannot make up the deficient volumes in the specified time period. Interruptible service revenue contracts typically contain fixed rates, with total consideration dependent on actual natural gas volumes that flow. Interruptible service revenues are recognized over time based on the output measure of natural gas volumes gathered, transported, or stored. Certain of our gathering contracts allow for the recovery of production-related operating expenses, which are offsetting in revenue and operating expense. Recovery of production-related operating expenses were $53 million, $65 million and $38 million for the years ended December 31, 2023, 2022 and 2021, respectively . Contract Liabilities The following is a summary of contract liability activity: 2023 2022 (millions) Balance as of January 1 $ 32 $ 28 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period (a) 101 13 Revenue recognized that was included in the balance at the beginning of the period (4) (9) Balance as of December 31 $ 129 $ 32 ____________________________________ (a) During the year ended December 31, 2023, we collected prepayment amounts from customers under various long-term revenue contracts on Ohio Utica Gathering, Appalachia Gathering, Blue Union Gathering and LEAP. Contract liabilities generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied. Contract liabilities associated with these services are recognized upon delivery of the service to the customer. The following table presents contract liability amounts as of December 31, 2023 that are expected to be recognized as revenue in future periods: (millions) 2024 $ 18 2025 20 2026 19 2027 18 2028 16 2029 and thereafter 38 Total $ 129 Transaction Price Allocated to the Remaining Performance Obligations In accordance with optional exemptions available under Topic 606, we do not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which the amount of revenue recognized depends upon our invoices for actual volumes gathered, transported, or stored, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation. Such contracts consist of various types of performance obligations, including providing midstream services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related contract consideration is variable at the contract inception. Contract lengths vary from cancellable to multi-year. The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2023 that are expected to be recognized as revenue in future periods: (millions) 2024 $ 131 2025 138 2026 109 2027 77 2028 52 2029 and thereafter 202 Total $ 709 Costs to Obtain or Fulfill a Contract We recognize an asset from the costs incurred to obtain a revenue contract only if we expect to recover those costs. In addition, the costs to fulfill a revenue contract are capitalized if the costs are specifically identifiable to a revenue contract, would result in enhancing resources that will be used in satisfying performance obligations in the future, and are expected to be recovered. These capitalized costs are amortized on a systematic basis consistent with the pattern of transfer of the services to which such costs relate. As of December 31, 2023 and 2022, we had capitalized costs to obtain or fulfill a contract of $18 million and $19 million, respectively, which are included in other current assets and other noncurrent assets in the accompanying Consolidated Statements of Financial Position. During the years ended December 31, 2023, 2022 and 2021 we recognized approximately $1 million of amortization expense related to such capitalized costs. Major Customers The following table summarizes customers which represent 10% or more of our total revenue for the years ended December 31, 2023, 2022 and 2021. Both Pipeline and Gathering segments provide services to these customers. 2023 2022 2021 Customer Percentage Customer Percentage Customer Percentage Revenue of Total Revenue of Total Revenue of Total Customers: (millions, except percentages) Customer A $ 560 60 % $ 596 65 % $ 563 67 % Customer B * * * * 84 10 % *Represents less than 10%

Goodwill

Goodwill	12 Months Ended
Goodwill	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL We have goodwill that resulted from business combinations. The carrying value of goodwill is evaluated for impairment on an annual basis or whenever events or circumstances indicate that the value of goodwill may be impaired. We performed our annual impairment test as of October 1, 2023 and determined that the estimated fair value of each reporting unit exceeded its carrying value, and no impairment existed. No additions, impairments or other changes occurred during the years ended December 31, 2023, 2022 and 2021. The following is the summary of the carrying value of goodwill: Year Ended December 31, 2023 2022 (millions) Pipeline $ 53 $ 53 Gathering 420 420 Total goodwill $ 473 $ 473

Property, Plant, and Equipment

Property, Plant, and Equipment and Intangible Assets	12 Months Ended
Property, Plant, and Equipment and Intangible Assets	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant, and Equipment and Intangible Assets	PROPERTY, PLANT, AND EQUIPMENT AND INTANGIBLE ASSETS Property, Plant, and Equipment The following is a summary of Property, plant, and equipment by classification: Average Estimated Useful Life December 31, 2023 2022 (years) (millions) Property, plant, and equipment Land and other non-depreciable assets N/A $ 96 $ 97 Rights of way and easements 25 to 40 103 103 Pipelines and interconnects 25 to 40 3,460 2,845 Facilities and processing plants 7 to 40 1,234 998 Wells and well equipment 40 to 70 70 70 General plant 3 to 40 40 32 Construction in progress N/A 279 389 Total Property, plant, and equipment $ 5,282 $ 4,534 Less accumulated depreciation (848) (728) Net Property, plant, and equipment $ 4,434 $ 3,806 Intangible Assets The following is a summary of Intangible Assets by classification: December 31, 2023 December 31, 2022 Useful Lives Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value (millions) Intangible assets subject to amortization Customer relationships 25 - 40 years (a) $ 2,252 $ (289) $ 1,963 $ 2,252 $ (233) $ 2,019 Contract intangibles 14 - 26 years 18 (13) 5 18 (12) 6 Total $ 2,270 $ (302) $ 1,968 $ 2,270 $ (245) $ 2,025 _____________________________________ (a) The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of natural gas resources in each region. The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2028: 2024 2025 2026 2027 2028 (millions) Estimated amortization expense $ 57 $ 57 $ 57 $ 57 $ 57 Depreciation and Amortization The following is a summary of depreciation and amortization expense by asset type: Year Ended December 31, 2023 2022 2021 (millions) Property, plant, and equipment $ 125 $ 113 $ 108 Customer relationships and other intangible assets, net 57 57 58 Total Depreciation and amortization $ 182 $ 170 $ 166

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Significant Accounting Policy – Accounting for Income Taxes We record the effect of income taxes in accordance with GAAP, which provides for the use of an asset and liability approach. Deferred income tax assets and liabilities are recognized for temporary differences between the basis of assets and liabilities for financial reporting and tax purposes and measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities as a result of changes in the enacted tax rates is recognized in earnings in the period of enactment. Our recognition of deferred tax assets is based upon a more-likely-than-not criterion. We routinely assess realizability based on objectively-weighted, available positive and negative evidence. We account for uncertainties in income taxes using a benefit recognition model with a two-step approach: a more-likely-than-not recognition criterion, and a measurement attribute that measures the position as the largest amount of tax benefit that is greater than a 50% likelihood of being realized upon ultimate settlement. If the benefit does not meet the more likely than not criteria for being sustained on its technical merits, no benefit will be recorded. Uncertain tax positions that relate only to timing of when an item is included on a tax return are considered to have met the recognition threshold. The Separation – Tax Considerations For period prior to the Separation, discussed at Note 1, "Description of the Business and Basis of Presentation", the income tax provision has been presented on a stand-alone basis as if we filed separate federal, state, local, and foreign income tax returns, referred to as the separate return method. Tax Legislation On July 8, 2022, the Commonwealth of Pennsylvania enacted House Bill (H.B.) 1342 which includes a corporate income tax rate reduction from 9.99% to 4.99% that will phase-in over a nine-year period. Our total Income Tax Expense varied from the statutory federal income tax rate for the following reasons: Year Ended December 31, 2023 2022 2021 (millions) Income Before Income Taxes $ 500 $ 482 $ 422 Income tax expense at statutory rate 105 101 89 State and local income taxes, net of federal benefit 18 24 17 State tax rate changes (18) (25) (3) Other, net (1) — 1 Income Tax Expense $ 104 $ 100 $ 104 Effective income tax rate 20.9 % 20.7 % 24.7 % Our 2023 effective tax rate includes the impact of state tax rate changes of an $18 million benefit driven by changes in tax status and updates to state apportionment which were completed in 2023 as a part of ongoing corporate tax structuring, simplification initiatives, and initial post-separation full-year tax return filings. Our 2022 effective tax rate includes the impact of state tax rate changes of a $25 million benefit driven by the Pennsylvania legislative changes. Components of Income Tax Expense were as follows: Year Ended December 31, 2023 2022 2021 (millions) Current income tax expense Federal $ (4) $ 16 $ 1 State and other income tax (2) 14 (1) Total current income taxes (6) 30 — Deferred income tax expense Federal 109 86 85 State and other income tax 1 (16) 19 Total deferred income tax 110 70 104 $ 104 $ 100 $ 104 Deferred tax assets and liabilities are recognized for the estimated future tax effect of temporary differences between the tax basis of assets or liabilities and the reported amounts in our Consolidated Financial Statements. We believe it is more likely than not that we will generate sufficient taxable income in future periods to realize our deferred tax assets. Deferred tax assets (liabilities) were comprised of the following: December 31, 2023 2022 (millions) Deferred income tax balance components Property, plant, and equipment $ (369) $ (336) Federal net operating loss carry-forward 184 129 State and local net operating loss carry-forward, net of federal 102 79 Investment in equity method investees and partnerships (979) (811) Other 31 16 Net deferred income tax asset / (liability) $ (1,031) $ (923) Total deferred income tax assets and liabilities Deferred income tax assets $ 319 $ 234 Deferred income tax liabilities (1,350) (1,157) Net deferred income tax asset / (liability) $ (1,031) $ (923) We have recorded a deferred tax asset related to a federal net operating loss carry-forward of $184 million as of December 31, 2023. U.S. federal net operating losses will be available to be carried forward indefinitely and available to offset 80% of taxable income in future years. We have recorded state and local deferred tax assets related to net operating loss carry-forwards of $102 million as of December 31, 2023. Of which, $97 million of the state and local net operating loss carry-forwards can be carried indefinitely and $5 million will expire from 2033 through 2042 and are available to offset varying amounts of taxable income in future years. Uncertain Tax Positions As of December 31, 2023 and 2022, we did not have any unrecognized tax benefits. For periods prior to the Separation, we were a member of the consolidated tax return of DTE Energy. As of December 31, 2023, DTE Energy did not have any open tax years subject to examination by the Internal Revenue Service (IRS) for which DT Midstream is a member. DTE Energy also files in multiple states, the statutes of which are open to examination for various periods.

Earnings Per Share and Dividend

Earnings Per Share and Dividends	12 Months Ended
Earnings Per Share and Dividends	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings Per Share and Dividends	EARNINGS PER SHARE AND DIVIDENDS Basic earnings per share is calculated by dividing Net Income attributable to DT Midstream by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares, using the treasury stock method. Restricted stock units and performance share awards, including dividend equivalents on those grants, are potentially dilutive and, if dilutive, are included in the determination of weighted-average shares outstanding. Restricted stock units and performance share awards do not receive cash dividends, as such, these awards are not considered participating securities. We issued 1,000 shares of common stock at $0.01 par value to its parent, a subsidiary of DTE Energy, in January 2021. Our Board of Directors authorized the issuance of an additional 96,731,466 common shares on June 30, 2021 for a total of 96,732,466 common shares issued and outstanding at the Separation date. This share amount is treated as issued and outstanding and utilized for the calculation of historical basic and diluted earnings per share for all periods prior to the Separation. The following is a reconciliation of basic and diluted earnings per share: Year Ended December 31, 2023 2022 2021 (millions, except per share amounts) Basic and Diluted Earnings per Common Share Net Income Attributable to DT Midstream $ 384 $ 370 $ 307 Average number of common shares outstanding — basic 96.9 96.7 96.7 Incremental shares attributable to: Average dilutive restricted stock units and performance share awards 0.6 0.5 0.2 Average number of common shares outstanding — diluted 97.5 97.2 96.9 Basic Earnings per Common Share $ 3.97 $ 3.83 $ 3.17 Diluted Earnings per Common Share $ 3.94 $ 3.81 $ 3.16 We declared the following cash dividends: Dividends Declared Dividend Amount Dividend Payment Date (quarter ended) (per-share) (millions) 2021 September 30 $ 0.60 $ 58 October 2021 December 31 $ 0.60 $ 58 January 2022 2022 March 31 $ 0.64 $ 62 April 2022 June 30 $ 0.64 $ 62 July 2022 September 30 $ 0.64 $ 62 October 2022 December 31 $ 0.64 $ 62 January 2023 2023 March 31 $ 0.69 $ 67 April 2023 June 30 $ 0.69 $ 67 July 2023 September 30 $ 0.69 $ 67 October 2023 December 31 $ 0.69 $ 67 January 2024

Fair Value

Fair Value	12 Months Ended
Fair Value	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value	FAIR VALUE Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. We make certain assumptions we believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. We believe we uses valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs. A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. We classify fair value balances based on the fair value hierarchy defined as follows: • Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access as of the reporting date. • Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the assets or liabilities or indirectly observable through corroboration with observable market data. • Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints. Fair Value of Financial Instruments The following table presents the carrying amount and fair value of financial instruments: December 31, 2023 December 31, 2022 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Cash equivalents (a) $ 36 $ — $ 36 $ — $ — $ — $ — $ — Long-term notes receivable — related party 4 — — 4 4 — — 4 Short-term borrowings (a) 165 — 165 — 330 — 330 — Long-term debt (b) $ 3,065 $ — $ 2,850 $ — $ 3,059 $ — $ 2,701 $ — ______________________________________ (a) Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value. (b) Carrying value represents principal of $3,099 million, net of unamortized debt discounts and issuance costs.

Debt

Debt	12 Months Ended
Debt	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt	DEBT Amendments to Credit Agreement In June 2023, we entered into an Amendment No. 2 to our Credit Agreement amending certain of the terms, including, among other things, the replacement of the interest rate provisions related to the Term Loan Facility from Eurodollar Rate to Term SOFR (as defined in the Credit Agreement). In October 2022, we amended the Credit Agreement to increase the Revolving Credit Facility commitments by $250 million to aggregate commitments of $1.0 billion. The amendment also extended the Revolving Credit Facility maturity date to October 19, 2027, replaced the Revolving Credit Facility's LIBOR interest rate references with Term SOFR, and incorporated various amendments, including amendments to pricing, guarantee and collateral provisions, that will become effective if we receive an investment-grade rating from two of the three credit rating agencies. Debt Issuances In April 2022, we issued $600 million in aggregate principal amount of 4.300% senior secured notes due April 2032. The 2032 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. The 2032 Notes have a security fall away provision where the collateral securing the notes will be released if we receive an investment-grade rating from two of the three credit rating agencies. In June 2021, we issued the senior unsecured notes of $1.1 billion in aggregate principal amount due June 15, 2029 and $1.0 billion in aggregate principal amount due June 15, 2031. Debt Redemptions In April 2022, we used $593 million of the net proceeds from the sale of the 2032 Notes to make a partial repayment on the existing indebtedness under the Term Loan Facility. As a result, required quarterly principal payments were eliminated, and the remaining Term Loan Facility balance is not due until maturity in 2028. There were no prepayment costs in conjunction with the partial redemption of the Term Loan Facility. The early redemption resulted in a loss on extinguishment of debt of $9 million and loss on modification of debt of $4 million relating to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities in our Consolidated Statements of Operations for the year ended December 31, 2022. Interest Expense The following table summarizes our interest expense: Year Ended December 31, 2023 2022 2021 (millions) Interest expense $ 170 $ 142 $ 113 Capitalized interest (20) (5) (1) Total interest expense, net $ 150 $ 137 $ 112 Long-Term Debt The following is a summary of long-term debt: Maturity December 31, December 31, Title Type Interest Rate Date 2023 2022 (millions) 2029 Notes Senior Notes (a) 4.125% 2029 $ 1,100 $ 1,100 2031 Notes Senior Notes (a) 4.375% 2031 1,000 1,000 2032 Notes Senior Secured Notes (b) 4.300% 2032 600 600 Term Loan Facility Term Loan Facility Variable (c) 2028 399 399 Long-term debt principal 3,099 3,099 Unamortized debt discount (2) (3) Unamortized debt issuance costs (32) (37) Long-term debt, net $ 3,065 $ 3,059 ______________________________ (a) Interest payable semi-annually in arrears each June 15 and December 15. (b) Interest payable semi-annually in arrears each April 15 and October 15. (c) Variable rate is SOFR plus 2.11% for a one-month interest period as of December 31, 2023. The following table presents scheduled debt maturities, excluding any unamortized discount on debt: 2024 2025 2026 2027 2028 and Thereafter Total (millions) Debt maturities $ — — — — 3,099 $ 3,099 Short-Term Credit Arrangements and Borrowings The following table presents the availability under the Revolving Credit Facility: December 31, 2023 (millions) Total availability Revolving Credit Facility, expiring October 2027 $ 1,000 Amounts outstanding Revolving Credit Facility borrowings (a) 165 Letters of credit 16 181 Net availability $ 819 ______________________________ (a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding is 6.72%. Borrowings under the Revolving Credit Facility are used for general corporate purposes, acquisitions, and letter of credit issuances to support our operations and liquidity. In April 2023, certain letters of credit totaling $23 million were replaced with surety bonds. See Note 12, "Commitments and Contingencies" for additional information. Revolving Credit Facility related issuance and amendment costs, net of amortization, were $6 million and $8 million, as of December 31, 2023 and 2022, respectively. These costs are included in other noncurrent assets in our Consolidated Statements of Financial Position and are being amortized over the remaining term of the Revolving Credit Facility. The Credit Agreement covering the Term Loan Facility and Revolving Credit Facility includes financial covenants that we must maintain. These covenants restrict the ability of DT Midstream and our subsidiaries to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers, consolidations, liquidations or dissolutions, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends and distributions or repurchase capital stock, prepay, redeem or repurchase certain junior indebtedness, enter into agreements that limit the ability of the restricted subsidiaries to make distributions to DT Midstream or the ability of DT Midstream and our restricted subsidiaries to incur liens on assets and enter into certain transactions with affiliates. The Term Loan Facility requires the maintenance of a minimum debt service coverage ratio of 1.1 to 1, and the Revolving Credit Facility requires maintenance of (i) a maximum consolidated net leverage ratio of 5 to 1, and (ii) a minimum interest coverage ratio of no less than 2.5 to 1. The debt service coverage ratio means the ratio of annual consolidated EBITDA to debt service, as defined in the Credit Agreement. The consolidated net leverage ratio means the ratio of net debt determined in accordance with GAAP to annual consolidated EBITDA. The interest coverage ratio means the ratio of annual consolidated EBITDA to annual interest expense, as defined in the Credit Agreement. The Credit Agreement definition of annual consolidated EBITDA excludes EBITDA from equity method investees, but includes dividends and distributions from equity method investees. As of December 31, 2023, the debt service coverage ratio, the consolidated net leverage ratio and the interest coverage ratio was 8.3 to 1, 2.4 to 1 and 7.8 to 1, respectively, and we were in compliance with these financial covenants. Dividend Restrictions The indenture governing the 2029 and 2031 Notes permits the payment of quarterly dividends on common stock in each fiscal year up to a dividend capacity calculated as defined in the indenture. For 2023, the dividend capacity remaining at year end was $356 million. The Credit Agreement permits the payment of quarterly dividends on common stock in each fiscal year as long as giving pro forma effect thereto, we maintain a first lien net leverage ratio that does not exceed 3.25 to 1. We maintained such first lien net leverage ratio as of December 31, 2023.

Leases

Leases	12 Months Ended
Leases	Dec. 31, 2023
Leases [Abstract]
Leases	LEASES Lessee Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets. Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term. We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases. We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases. We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices. The components of lease cost for the following years includes: Year Ended December 31, 2023 2022 2021 (millions) Operating lease cost $ 20 $ 20 $ 19 Short-term lease cost 3 3 1 $ 23 $ 23 $ 20 Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. We have elected not to apply the lease balance sheet recognition requirements to short-term leases with a term of 12 months or less. Operating and short-term lease costs are recorded to operation and maintenance in our Consolidated Statements of Operations. Other relevant information related to leases for the following years includes: Year Ended December 31, 2023 2022 2021 Supplemental Cash Flows Information (millions, except years and percentages) Cash paid for amounts included in the measurement of these liabilities: Operating cash flows for operating leases $ 21 $ 18 $ 19 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 25 $ 14 $ 9 Weighted Average Remaining Lease Term Operating leases 4.4 years 4.0 years 4.4 years Weighted Average Discount Rate Operating leases 4.8 % 3.5 % 2.6 % Future minimum lease payments under leases for remaining periods as of December 31, 2023 are as follows: Operating Leases (millions) 2024 $ 15 2025 9 2026 7 2027 7 2028 2 2029 and thereafter 4 Total future minimum lease payments 44 Imputed interest (4) Lease liabilities $ 40 Lessor We lease assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 15 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value. A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets. Fixed lease income associated with the operating lease was $7 million, $10 million, and $9 million for the years ended December 31, 2023, 2022 and 2021, respectively. Fixed lease income is reported in Operating revenues in our Consolidated Statements of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2023, 2022 and 2021. Future minimum rental revenues for remaining periods as of December 31, 2023 are as follows: Operating Lease (millions) 2024 $ 9 2025 9 2026 9 2027 9 2028 9 2029 and thereafter 88 Total future minimum rental revenues $ 133 Property under the operating lease is as follows: December 31, 2023 2022 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 15 $ 12
Leases	LEASES Lessee Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets. Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term. We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases. We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases. We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices. The components of lease cost for the following years includes: Year Ended December 31, 2023 2022 2021 (millions) Operating lease cost $ 20 $ 20 $ 19 Short-term lease cost 3 3 1 $ 23 $ 23 $ 20 Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. We have elected not to apply the lease balance sheet recognition requirements to short-term leases with a term of 12 months or less. Operating and short-term lease costs are recorded to operation and maintenance in our Consolidated Statements of Operations. Other relevant information related to leases for the following years includes: Year Ended December 31, 2023 2022 2021 Supplemental Cash Flows Information (millions, except years and percentages) Cash paid for amounts included in the measurement of these liabilities: Operating cash flows for operating leases $ 21 $ 18 $ 19 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 25 $ 14 $ 9 Weighted Average Remaining Lease Term Operating leases 4.4 years 4.0 years 4.4 years Weighted Average Discount Rate Operating leases 4.8 % 3.5 % 2.6 % Future minimum lease payments under leases for remaining periods as of December 31, 2023 are as follows: Operating Leases (millions) 2024 $ 15 2025 9 2026 7 2027 7 2028 2 2029 and thereafter 4 Total future minimum lease payments 44 Imputed interest (4) Lease liabilities $ 40 Lessor We lease assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 15 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value. A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets. Fixed lease income associated with the operating lease was $7 million, $10 million, and $9 million for the years ended December 31, 2023, 2022 and 2021, respectively. Fixed lease income is reported in Operating revenues in our Consolidated Statements of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2023, 2022 and 2021. Future minimum rental revenues for remaining periods as of December 31, 2023 are as follows: Operating Lease (millions) 2024 $ 9 2025 9 2026 9 2027 9 2028 9 2029 and thereafter 88 Total future minimum rental revenues $ 133 Property under the operating lease is as follows: December 31, 2023 2022 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 15 $ 12

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES From time to time, we are subject to legal, administrative and environmental proceedings before various courts, arbitration panels and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits and pending judicial matters. We cannot predict the final disposition of such proceedings. We regularly review legal matters and records provisions for claims that we can estimate and are considered probable of loss. The amount or range of reasonably possible losses is not anticipated to, either individually or in the aggregate, materially adversely affect our business, financial condition and results of operations. Guarantees In certain limited circumstances, we enter into contractual guarantees. We may guarantee another entity's obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. We did not have any guarantees of other parties' obligations as of December 31, 2023. Purchase Commitments As of December 31, 2023, we were party to long-term purchase commitments relating to a variety of goods and services required for our business. We estimate lifetime purchase commitments of approximately $103 million, due in the periods shown below. (millions) 2024 $ 14 2025 13 2026 12 2027 11 2028 11 2029 and thereafter 42 Total $ 103 Surety Bonds In certain limited circumstances, we enter into contracts that require us to obtain external surety bonds to secure our payment and performance. We agree to indemnify the issuers of these surety bonds for amounts, if any, paid by them under these agreements. In the event that any surety bonds are called for non-performance, we would be obligated to reimburse the issuer of the surety bond. The maximum potential indemnification under our surety bond agreements as of December 31, 2023 is $32 million. Vector Line of Credit We are the lender under a revolving term credit facility to Vector, the borrower, in the amount of Canadian $70 million. The credit facility was executed in response to the passage of Canadian regulations requiring oil and gas pipelines to demonstrate their financial ability to respond to a catastrophic event and exists for the sole purpose of satisfying these regulations. Vector may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payout as of December 31, 2023 is USD $53 million. The funding of a loan under the terms of the revolving term credit facility is considered remote. Contingent Liability In order to comply with certain state environmental regulations, we have an obligation to restore pipeline right-of-way slope failures that may arise in the ordinary course of business in the Utica and Marcellus formations. We conducted

Stock-based Compensation and De

Stock-based Compensation and Defined Contribution Plans	12 Months Ended
Stock-based Compensation and Defined Contribution Plans	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based Compensation and Defined Contribution Plans	STOCK-BASED COMPENSATION AND DEFINED CONTRIBUTION PLANS The DT Midstream, Inc. Long-Term Incentive Plan ("DT Midstream Plan") permits the grant of incentive and nonqualified stock options, stock appreciation rights, restricted stock awards and restricted stock units, performance share awards, and performance units to employees, consultants and members of DT Midstream's Board of Directors. As a result of a restricted stock award grant, restricted stock unit or performance share award settlement, or by exercise of a stock option, we may issue common stock from our authorized but unissued common stock and/or from outstanding common stock acquired by or on behalf of DT Midstream in the participant's name. The DT Midstream Plan began on the Separation date. Key provisions of the DT Midstream Plan are: • Authorized limit as of December 31, 2023 was 6,500,000 shares of common stock. The authorized limit increases annually on January 1 by the lesser of 1,750,000 shares of common stock or the amount determined by the DT Midstream Board of Directors. • Prohibits the grant of a stock option with an exercise price that is less than the fair market value of DT Midstream's stock on the grant date. Prior to the Separation, our employees participated in DTE Energy's Long-Term Incentive Plan. At the Separation, outstanding DT Midstream employee restricted stock awards and performance share awards were modified or settled as follows: • DTE Energy restricted stock awards were converted into DT Midstream restricted stock units; • Unsettled DTE Energy performance share awards were converted into DT Midstream performance share awards. The restricted stock awards and performance share awards were converted using a formula designed to preserve the fair value of the awards immediately prior to the Separation. All converted awards retained the vesting schedule of the original awards. The conversion of the restricted stock awards and performance share awards qualified as an accounting modification under GAAP. The pre- and post- Separation fair value of the awards was compared, and any incremental fair value was added to the original grant date fair value of the awards. The Separation modification gave rise to incremental fair value of approximately $1 million for the performance share awards granted in January 2021 and is reflected in the compensation cost and the unrecognized compensation costs described below. The Separation modification did not result in incremental fair value for any other converted restricted stock awards or performance share awards. Prior to the Separation, we received an allocation of costs from DTE Energy associated with stock-based compensation. Allocated costs for the first six months of 2021 are included in the table below. No costs were allocated after July 1, 2021. The following table summarizes our stock-based compensation expense and the related income tax benefit: Year Ended December 31, 2023 2022 2021 (millions) Stock-based compensation expense $ 20 $ 17 $ 12 Tax benefit $ 5 $ 4 $ 3 Restricted Stock Units Restricted stock units granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three During the vesting period, the number of restricted stock units granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a restricted stock unit has no shareholder rights during the vesting period. Restricted stock units are nontransferable and subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur. The following table summarizes restricted stock unit activity for the year ended December 31, 2023: Restricted Weighted- Average (thousands) (per share) Nonvested as of December 31, 2022 468 $ 43.28 Granted (a) 103 51.28 Forfeited (5) 47.80 Vested (149) 41.52 Nonvested as of December 31, 2023 417 $ 45.68 _____________________________________ (a) Includes initial grants and dividends reinvested. The weighted-average grant date fair value of restricted stock units granted, excluding dividends reinvested, during the years ended December 31, 2023 and 2022 was $52.66 and $52.25, respectively. No restricted stock units were granted during the year ended December 31, 2021. The intrinsic value of restricted stock units vested and issued during the years ended December 31, 2023, 2022 and 2021 was $8 million, $3.3 million, and $0.1 million, respectively. Performance Share Awards Performance share awards granted under the DT Midstream Plan are for a specified number of shares of DT Midstream common stock that entitle the holder to receive common stock, a cash payment, or a combination thereof at the end of the specified vesting period, which is generally three years. Performance share awards are deemed to be equity awards. Performance share stock-based compensation expense is accrued over the vesting period based on the grant date fair value calculated using: (i) DT Midstream's closing common stock price on the grant date; (ii) the grant date fair value of the market condition; and (iii) the probable achievement of performance objectives. For the performance share awards converted at the Separation, the grant date fair value was based on DTE Energy's stock price and market conditions at grant date. The number of shares issued at settlement is determined based on market conditions and the achievement of certain DT Midstream performance objectives. Performance share awards are settled with DT Midstream common stock and fractional shares are settled in cash. During the vesting period, the number of performance share awards granted will increase, assuming full dividend reinvestment on each dividend payment date. The recipient of a performance share award has no shareholder rights during the vesting period. Performance share awards are nontransferable and are subject to risk of forfeiture during the vesting period. Forfeitures are recognized in the period they occur. The following table summarizes performance share award activity for the year ended December 31, 2023: Performance Share Awards Weighted- Average (thousands) (per share) Nonvested as of December 31, 2022 409 $ 56.55 Granted (a) 334 59.02 Forfeited (19) 62.31 Settled (167) 34.83 Nonvested as of December 31, 2023 557 $ 64.36 _____________________________________ (a) Includes initial grants, dividends reinvested and shares added for achievement of final performance objectives on settled awards. The weighted-average grant date fair value of performance share awards granted, excluding dividends reinvested, during the years ended December 31, 2023 and 2022 was $53.74 and $72.97, respectively. The intrinsic value of performance share awards settled during the years ended December 31, 2023 and 2022 was $9 million and $4 million, respectively. No performance share awards were granted or settled by DT Midstream during the year ended December 31, 2021. Unrecognized Compensation Costs As of December 31, 2023, we had $23 million of total unrecognized compensation costs related to non-vested stock incentive plan arrangements. The cost is expected to be recognized over a weighted-average period of 1.67 years. Defined Contribution Plans We sponsor defined contribution retirement savings plans, and participation in one of these plans is available to substantially all employees. We match employee contributions up to certain predefined and Internal Revenue Service limits based on eligible compensation and each employee's contribution rate, and contributes additional amounts in lieu of traditional pension and post-employment healthcare benefits. Prior to the Separation, we participated in the defined contribution retirement savings plans of DTE Energy. DT Midstream's cost for these plans was $7 million, $5 million and $3 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Segment and Related Information

Segment and Related Information	12 Months Ended
Segment and Related Information	Dec. 31, 2023
Segment Reporting [Abstract]
Segment and Related Information	SEGMENT AND RELATED INFORMATION We set strategic goals, allocate resources, and evaluate performance based on the following structure: The Pipeline segment owns and operates interstate and intrastate natural gas pipelines, storage systems, and natural gas gathering lateral pipelines. The Pipeline segment also has interests in equity method investees that own and operate interstate natural gas pipelines. The segment is engaged in the transportation and storage of natural gas for intermediate and end user customers. During the three months ended March 31, 2023, we completed the conversion of the Michigan System from gathering to dry gas transmission service and began providing services under a new long-term dry gas transmission contract. For the year ended December 31, 2023, the Michigan System financial results are presented in the Pipeline segment. The prior years' comparative activity was for gathering services and therefore was not revised from presentation in the Gathering segment. The Gathering segment owns and operates gas gathering systems. The segment is engaged in collecting natural gas from points at or near customers’ wells for delivery to plants for treating, to gathering pipelines for further gathering, or to pipelines for transportation, as well as associated ancillary services, including compression, dehydration, gas treatment, water impoundment, water transportation, water disposal, and sand mining. Inter-segment billing for goods and services exchanged between segments is based upon contracted prices of the provider. Inter-segment billings were not significant for the years ended December 31, 2023, 2022 and 2021. Financial data for our business segments follows: Year Ended December 31, 2023 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 377 $ 545 $ — $ 922 Operation and maintenance 55 190 — 245 Depreciation and amortization 69 113 — 182 Taxes other than income 15 13 — 28 Asset (gains) losses and impairments, net (4) — — (4) Operating Income 242 229 — 471 Interest expense 55 95 — 150 Interest income (1) — — (1) Earnings from equity method investees (177) — — (177) Other (income) and expense — (1) — (1) Income Tax Expense 75 29 — 104 Net Income 290 106 — 396 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 278 $ 106 $ — $ 384 Capital expenditures $ 255 $ 517 $ — $ 772 December 31, 2023 Investments in equity method investees $ 1,762 $ — $ — $ 1,762 Goodwill 53 420 — 473 Total Assets $ 4,439 $ 4,543 $ — $ 8,982 Year Ended December 31, 2022 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 339 $ 581 $ — $ 920 Operation and maintenance 54 213 — 267 Depreciation and amortization 63 107 — 170 Taxes other than income 14 14 — 28 Asset (gains) losses and impairments, net (6) (17) — (23) Operating Income 214 264 — 478 Interest expense 57 80 — 137 Interest income (1) (2) — (3) Earnings from equity method investees (150) — — (150) Loss from financing activities 6 7 — 13 Other (income) and expense — (1) — (1) Income Tax Expense 62 38 — 100 Net Income 240 142 — 382 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 228 $ 142 $ — $ 370 Capital expenditures and acquisitions $ 638 $ 252 $ — $ 890 December 31, 2022 Investments in equity method investees $ 2,200 $ — $ — $ 2,200 Goodwill 53 420 — 473 Total Assets $ 4,625 $ 4,208 $ — $ 8,833 Year Ended December 31, 2021 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 307 $ 534 $ (1) $ 840 Operation and maintenance 59 173 (1) 231 Depreciation and amortization 63 103 — 166 Taxes other than income 13 11 — 24 Asset (gains) losses and impairments, net — 17 — 17 Operating Income 172 230 — 402 Interest expense 51 61 — 112 Interest income (1) (3) — (4) Earnings from equity method investees (126) — — (126) Other (income) and expense (3) 1 — (2) Income Tax Expense 62 42 — 104 Net Income 189 129 — 318 Less: Net Income Attributable to Noncontrolling Interests 11 — — 11 Net Income Attributable to DT Midstream $ 178 $ 129 $ — $ 307 Capital expenditures $ 20 $ 120 $ — $ 140 December 31, 2021 Investments in equity method investees $ 1,691 $ — $ — $ 1,691 Goodwill 53 420 — 473 Total Assets $ 4,165 $ 4,001 $ — $ 8,166

Related Party Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS Transactions between DT Midstream and DTE Energy prior to the Separation, as well as all transactions between DT Midstream and our equity method investees, have been presented as related party transactions in the accompanying Consolidated Financial Statements. Prior to the Separation, DTE Energy and its subsidiaries provided physical operations, maintenance, and technical support pursuant to an operating agreement for our facilities. We also utilized various services performed by DTE Energy and its subsidiaries including marketing and capacity optimization services. Prior to the Separation, interest expense recorded in the Consolidated Statements of Operations was primarily related to interest on the Short-term borrowings due to DTE Energy, amounts of which are shown in the table below. The working capital loan agreement had an interest rate of 3.3% for 2021 and a term of one year. No interest expense on Short-term borrowings due to DTE Energy was incurred after the Separation. In June 2021, we made the following cash payments: • Settled Short-term borrowings due to DTE Energy as of June 30, 2021 of $2,537 million • Settled Accounts receivable due from DTE Energy and Accounts payable due to DTE Energy as of June 30, 2021 for net cash of $9 million • Provided a one-time special dividend to DTE Energy On July 1, 2021, DTE Energy completed the Separation through the distribution of 96,732,466 shares of DT Midstream common stock to DTE Energy shareholders. After the Separation, DTE Energy is not considered a related party of DT Midstream. The following is a summary of our balances with related parties: December 31, 2023 2022 (millions) Notes receivable from Vector — long-term $ 4 $ 4 Current Liabilities — Other 1 3 The following is a summary of our transactions with related parties: Year Ended December 31, 2023 2022 2021 (millions) Revenues Pipeline $ — $ — $ 5 Gathering — — 10 Other Costs Interest income — — (5) Interest expense — — 43 Operation and maintenance and Other expense (1) (1) 43 Other Notes receivable (due from) repaid by DTE Energy — — 263 Short-term borrowings (repayment of borrowings) from DTE Energy — — (3,175) Dividend to DTE Energy — — (501) Contributions from DTE Energy — — 110 Non-cash distributions to DTE Energy — — (10)

Subsequent Event

Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENT Dividend Declaration On February 16, 2024, we announced that our Board of Directors declared a quarterly dividend of $0.735 per share of common stock. The dividend is payable to stockholders of record as of March 18, 2024 and is expected to be paid on April 15, 2024.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income Attributable to DT Midstream	$ 384	$ 370	$ 307

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
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

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements and Notes to Consolidated Financial Statements as of and for the periods presented subsequent to July 1, 2021, the date of the Separation, reflect the consolidated financial position, results of operations and cash flows for DT Midstream as an independent company. Prior to the Separation, we operated as a consolidated entity of DTE Energy and not as a standalone company. For the periods prior to the Separation, the Consolidated Financial Statements and Notes to Consolidated Financial Statements were prepared on a carve-out basis using the consolidated financial statements and accounting records of DTE Energy. The carve-out basis financial statements represent our historical financial position, results of operations, and cash flows as they were historically managed in accordance with GAAP and reflect significant assumptions and allocations. The carve-out financial statements may not include all expenses that would have been incurred had we existed as a standalone entity.
Principles of Consolidation	Principles of Consolidation We consolidate all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-controlled investments are accounted for using the equity method of accounting when we are able to significantly influence the operating policies of the investee. When we do not influence the operating policies of an investee, the equity investment is measured at fair value, if readily determinable, or if not readily determinable, at cost less impairment, if applicable. We eliminate all intercompany balances and transactions. We evaluate whether an entity is a VIE whenever reconsideration events occur. We consolidate VIEs for which we are the primary beneficiary. If we are not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, we consider all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. We perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed. We own an 85% interest in the Stonewall VIE and are the primary beneficiary, therefore Stonewall is consolidated. We own a 50% interest in the South Romeo VIE and are the primary beneficiary, therefore South Romeo is consolidated.
Cash and Cash Equivalents	Cash and Cash Equivalents
Financing Receivables	Financing Receivables Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value. We regularly monitor the credit quality of our financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. We have three internal grades of credit quality, with internal grade 1 as the lowest risk and internal grade 3 as the highest risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2023. As of December 31, 2023, the Notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2023. Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. We cease accruing interest income (nonaccrual status) and may either write off or establish an allowance for expected credit loss for the note receivable when it is expected that all contractual principal or interest amounts due will not be collected. In determining an allowance for expected credit losses for or the write off of notes receivable, we consider the historical payment experience and other factors that are expected to have a specific impact on collection, including existing and future economic conditions. Cash receipts for notes receivable on nonaccrual status that do not bring the account contractually current are first applied to contractually owed past due interest, with any remainder applied to principal. Recognition of interest income is generally resumed when the note receivable becomes contractually current. We had an investment in certain assets in the Utica Shale region which was accounted for as a note receivable — third party. In the second quarter 2021, we assessed the note receivable for expected loss and recorded a $19 million loss on the note receivable to Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. Additionally, we ceased accruing interest on the note receivable balance and reclassified the note to an Internal grade 3 receivable. Subsequently, as cash payments were received, a portion was recognized as interest income. A third party purchased our investment in certain assets in the Utica Shale region based on significantly improved commodity pricing during the second quarter 2022 for proceeds of $22 million. This resulted in a gain of $17 million recorded in Asset (gains) losses and impairments, net on the Consolidated Statement of Operations. We maintain no continuing involvement with the note receivable.
Property, Plant, and Equipment	Property, Plant, and Equipment
Intangible Assets and Long-Lived Assets	Intangible Assets Intangible assets with finite useful lives are amortized on a straight-line basis over the periods benefited. See Note 6, "Property, Plant, and Equipment and Intangible Assets" to the Consolidated Financial Statements. Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate the carrying amount of an asset may not be recoverable. If the carrying amount of the asset exceeds the expected undiscounted future cash flows generated by the asset, an impairment loss is recognized resulting in the asset being written down to its estimated fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less costs to sell.
Operations and Maintenance	Operation and Maintenance Operation and maintenance is primarily comprised of costs for labor and employee benefits, outside services, materials, compression, purchased natural gas, operating lease costs, office costs, and other operating and maintenance costs. For the year ended December 31, 2021, general corporate expense allocations from DTE Energy of $32 million, including $20 million of Separation-related transaction costs for legal, accounting, auditing and other professional services DTE Energy incurred for the benefit of DT Midstream, were also included in operation and maintenance. Effective July 1, 2021, with the completion of the Separation, we no longer received corporate allocations from DTE Energy.
Depreciation and Amortization	Depreciation and Amortization Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses.
Recently Issued Pronouncements	Recently Issued Pronouncements In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures . The amendments improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses and interim disclosure requirements. The amendments are effective for fiscal years beginning after December 15, 2023 and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our Consolidated Financial Statements. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures. The amendments improve transparency of income tax disclosure requirements, primarily through enhanced disclosures of rate reconciliation and income taxes paid. The amendments are effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The adoption of this standard is not expected to have a significant impact on our Consolidated Financial Statements.
Accounting for Income Taxes	Significant Accounting Policy – Accounting for Income Taxes We record the effect of income taxes in accordance with GAAP, which provides for the use of an asset and liability approach. Deferred income tax assets and liabilities are recognized for temporary differences between the basis of assets and liabilities for financial reporting and tax purposes and measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities as a result of changes in the enacted tax rates is recognized in earnings in the period of enactment. Our recognition of deferred tax assets is based upon a more-likely-than-not criterion. We routinely assess realizability based on objectively-weighted, available positive and negative evidence.
Revenue	Significant Accounting Policy – Revenue Pipeline revenues consist of services related to the gathering, transportation and/or storage of natural gas. Gathering revenues consist of services related to the gathering, processing, and/or treating of natural gas. Revenue is measured based upon the pricing or consideration for such services specified in the contract with a customer. Consideration may consist of both fixed components including fixed demand charges and fixed deficiency fee rates for MVCs, and variable components including fixed rates for the actual volumes flowed under interruptible services and other associated fees. Our contracts with customers generally contain a single performance obligation, which is a promise to deliver either a distinct service or a series of distinct services to the customer. When multiple performance obligations exist, the contract consideration is allocated between the performance obligations based on the relative standalone selling price, which is determined by prices charged to customers or the adjusted market assessment approach. The adjusted market assessment approach involves evaluating the market in which we sell services and estimating the price that a customer in that market would be willing to pay.
Lessee	Lessee Our leases are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease exists when we have the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration paid. The right to control is deemed to occur when we have the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets. Lease liabilities are calculated utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease if it is readily determinable. When the rate implicit in the lease is not readily determinable, the incremental borrowing rate is used. The incremental borrowing rate is based upon the rate of interest that would have been paid on a collateralized basis over similar contract terms to that of the leases. The incremental borrowing rates have been determined utilizing an implied secured borrowing rate based upon an unsecured rate for a similar time period of remaining lease terms, which is then adjusted for the estimated impact of collateral. We have leases with non-index-based escalation clauses for fixed dollar or percentage increases over the contract term. We have certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, we have determined it is not reasonably certain that such purchase options will be exercised. Thus, the impact of the purchase options has not been included in the determination of right-of-use assets and lease liabilities for the subject leases. We have certain leases which contain renewal options. Where the renewal options were deemed reasonably certain to occur, the impacts of such options were included in the determination of the right-of-use assets and lease liabilities for the subject leases. We have agreements with lease and non-lease components, which are generally accounted for separately. Consideration in a lease is allocated between lease and non-lease components based upon the estimated relative standalone prices.
Lessor	Lessor We lease assets under an operating lease for a pipeline which commenced in December 2018. The lease is comprised of fixed payments with a remaining term of 15 years. The operating lease does not have renewal provisions or options to purchase the assets at the end of the lease and does not have termination for convenience provisions. The lease term extends to the end of the estimated economic life of the leased assets, thereby resulting in no residual value. A lease exists when we have provided other parties with the right to control the use of identified property, plant or equipment, as conveyed through a contract, for a certain time period and consideration received. The right to control is deemed to occur when we have provided other parties with the right to obtain substantially all of the economic benefits of the identified assets and the right to direct the use of such assets.

Description of the Business a_2

Description of the Business and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	The following table summarizes the major line items in the Consolidated Statements of Financial Position for consolidated VIEs as of December 31, 2023 and 2022. All assets and liabilities of a consolidated VIE are included in the table when it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. The assets and liabilities of consolidated VIEs that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIEs' obligations have been excluded from the table below. December 31, 2023 2022 (millions) ASSETS (a) Cash $ 13 $ 27 Accounts receivable 10 9 Other current assets 2 3 Intangible assets, net 483 498 Property, plant and equipment, net 391 403 Goodwill 25 25 $ 924 $ 965 LIABILITIES (a) Accounts payable and other current liabilities $ 4 $ 4 Other noncurrent liabilities 3 4 $ 7 $ 8 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities.
Schedule of Equity Method Investments	Equity method investees are described below: Investments As of % Owned As of December 31, December 31, Equity Method Investee 2023 2022 2023 2022 (millions) NEXUS $ 900 $ 1,313 50% 50% Vector 135 135 40% 40% Millennium 727 752 52.5% 52.5% Total investments in equity method investees $ 1,762 $ 2,200 The following tables present summarized financial information of our non-consolidated equity method investees. The amounts included below represent 100% of the results of continuing operations of such entities, including the portion owned by other parties. Summarized balance sheet data is as follows: December 31, 2023 2022 (millions) Current assets $ 159 $ 198 Noncurrent assets 4,057 4,160 Current liabilities 208 206 Noncurrent liabilities $ 1,177 $ 476 Summarized income statement data is as follows: Year Ended December 31, 2023 2022 2021 (millions) Operating revenues $ 823 $ 800 $ 738 Operating expenses 377 396 371 Net Income $ 392 $ 372 $ 333

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
Significant Accounting Policies (Tables)	Dec. 31, 2023
Accounting Policies [Abstract]
Schedule of Roll-Forward of Activity for Financing Receivables Allowance for Expected Credit Loss	Our collections on accounts receivable from customers are current, and no material rate of historical loss was noted, which resulted in no allowance for expected credit loss as of December 31, 2023 or 2022. The following table presents a roll-forward of the activity for the notes receivables' allowance for expected credit loss. The balance, if any, is shown as a deduction from the notes receivables' balance in the Consolidated Statements of Financial Position. 2023 2022 2021 Allowance for expected credit loss- Notes Receivable (millions) Balance as of January 1 $ — $ — $ — Additions: Charged to costs, expenses, and other accounts — — 19 Deductions: Current period provision and write-offs charged against allowance — — (19) Balance as of December 31 $ — $ — $ —
Other Accounting Policies	Other Accounting Policies Footnote Title Note 4 Revenue Note 7 Income Taxes Note 9 Fair Value Note 11 Leases

Revenue (Tables)

Revenue (Tables)	12 Months Ended
Revenue (Tables)	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following is a summary of revenues disaggregated by segment: Year Ended December 31, 2023 2022 2021 (millions) Pipeline (a) $ 377 $ 339 $ 307 Gathering 545 581 534 Elimination of Inter-segment Revenue — — (1) Total operating revenues $ 922 $ 920 $ 840 __________________________________ (a) Includes revenues outside the scope of ASC 606 primarily related to contracts accounted for as leases of $7 million, $10 million and $9 million for the years ended December 31, 2023, 2022 and 2021, respectively.
Summary of Contact Liability Activity	The following is a summary of contract liability activity: 2023 2022 (millions) Balance as of January 1 $ 32 $ 28 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period (a) 101 13 Revenue recognized that was included in the balance at the beginning of the period (4) (9) Balance as of December 31 $ 129 $ 32 ____________________________________
Revenue Expected to be Recognized in Future Periods	The following table presents contract liability amounts as of December 31, 2023 that are expected to be recognized as revenue in future periods: (millions) 2024 $ 18 2025 20 2026 19 2027 18 2028 16 2029 and thereafter 38 Total $ 129 The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2023 that are expected to be recognized as revenue in future periods: (millions) 2024 $ 131 2025 138 2026 109 2027 77 2028 52 2029 and thereafter 202 Total $ 709

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
Goodwill (Tables)	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following is the summary of the carrying value of goodwill: Year Ended December 31, 2023 2022 (millions) Pipeline $ 53 $ 53 Gathering 420 420 Total goodwill $ 473 $ 473

Property, Plant, and Equipmen_2

Property, Plant, and Equipment and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	The following is a summary of Property, plant, and equipment by classification: Average Estimated Useful Life December 31, 2023 2022 (years) (millions) Property, plant, and equipment Land and other non-depreciable assets N/A $ 96 $ 97 Rights of way and easements 25 to 40 103 103 Pipelines and interconnects 25 to 40 3,460 2,845 Facilities and processing plants 7 to 40 1,234 998 Wells and well equipment 40 to 70 70 70 General plant 3 to 40 40 32 Construction in progress N/A 279 389 Total Property, plant, and equipment $ 5,282 $ 4,534 Less accumulated depreciation (848) (728) Net Property, plant, and equipment $ 4,434 $ 3,806
Schedule of Intangible Assets	The following is a summary of Intangible Assets by classification: December 31, 2023 December 31, 2022 Useful Lives Gross Carrying Value Accumulated Amortization Net Carrying Value Gross Carrying Value Accumulated Amortization Net Carrying Value (millions) Intangible assets subject to amortization Customer relationships 25 - 40 years (a) $ 2,252 $ (289) $ 1,963 $ 2,252 $ (233) $ 2,019 Contract intangibles 14 - 26 years 18 (13) 5 18 (12) 6 Total $ 2,270 $ (302) $ 1,968 $ 2,270 $ (245) $ 2,025 _____________________________________
Schedule of Estimated Intangibles Assets Amortization Expense	The following table summarizes estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2028: 2024 2025 2026 2027 2028 (millions) Estimated amortization expense $ 57 $ 57 $ 57 $ 57 $ 57
Schedule of Depreciation and Amortization	The following is a summary of depreciation and amortization expense by asset type: Year Ended December 31, 2023 2022 2021 (millions) Property, plant, and equipment $ 125 $ 113 $ 108 Customer relationships and other intangible assets, net 57 57 58 Total Depreciation and amortization $ 182 $ 170 $ 166

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	Our total Income Tax Expense varied from the statutory federal income tax rate for the following reasons: Year Ended December 31, 2023 2022 2021 (millions) Income Before Income Taxes $ 500 $ 482 $ 422 Income tax expense at statutory rate 105 101 89 State and local income taxes, net of federal benefit 18 24 17 State tax rate changes (18) (25) (3) Other, net (1) — 1 Income Tax Expense $ 104 $ 100 $ 104 Effective income tax rate 20.9 % 20.7 % 24.7 %
Schedule of Income Tax Expense	Components of Income Tax Expense were as follows: Year Ended December 31, 2023 2022 2021 (millions) Current income tax expense Federal $ (4) $ 16 $ 1 State and other income tax (2) 14 (1) Total current income taxes (6) 30 — Deferred income tax expense Federal 109 86 85 State and other income tax 1 (16) 19 Total deferred income tax 110 70 104 $ 104 $ 100 $ 104
Schedule of Deferred Tax Assets (Liabilities)	Deferred tax assets (liabilities) were comprised of the following: December 31, 2023 2022 (millions) Deferred income tax balance components Property, plant, and equipment $ (369) $ (336) Federal net operating loss carry-forward 184 129 State and local net operating loss carry-forward, net of federal 102 79 Investment in equity method investees and partnerships (979) (811) Other 31 16 Net deferred income tax asset / (liability) $ (1,031) $ (923) Total deferred income tax assets and liabilities Deferred income tax assets $ 319 $ 234 Deferred income tax liabilities (1,350) (1,157) Net deferred income tax asset / (liability) $ (1,031) $ (923)

Earnings Per Share and Divide_2

Earnings Per Share and Dividends (Tables)	12 Months Ended
Earnings Per Share and Dividends (Tables)	Dec. 31, 2023
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share	The following is a reconciliation of basic and diluted earnings per share: Year Ended December 31, 2023 2022 2021 (millions, except per share amounts) Basic and Diluted Earnings per Common Share Net Income Attributable to DT Midstream $ 384 $ 370 $ 307 Average number of common shares outstanding — basic 96.9 96.7 96.7 Incremental shares attributable to: Average dilutive restricted stock units and performance share awards 0.6 0.5 0.2 Average number of common shares outstanding — diluted 97.5 97.2 96.9 Basic Earnings per Common Share $ 3.97 $ 3.83 $ 3.17 Diluted Earnings per Common Share $ 3.94 $ 3.81 $ 3.16
Schedule of Cash Dividends Declared	We declared the following cash dividends: Dividends Declared Dividend Amount Dividend Payment Date (quarter ended) (per-share) (millions) 2021 September 30 $ 0.60 $ 58 October 2021 December 31 $ 0.60 $ 58 January 2022 2022 March 31 $ 0.64 $ 62 April 2022 June 30 $ 0.64 $ 62 July 2022 September 30 $ 0.64 $ 62 October 2022 December 31 $ 0.64 $ 62 January 2023 2023 March 31 $ 0.69 $ 67 April 2023 June 30 $ 0.69 $ 67 July 2023 September 30 $ 0.69 $ 67 October 2023 December 31 $ 0.69 $ 67 January 2024

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
Fair Value (Tables)	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Carrying Amount of Fair Value of Financial Instruments	The following table presents the carrying amount and fair value of financial instruments: December 31, 2023 December 31, 2022 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Cash equivalents (a) $ 36 $ — $ 36 $ — $ — $ — $ — $ — Long-term notes receivable — related party 4 — — 4 4 — — 4 Short-term borrowings (a) 165 — 165 — 330 — 330 — Long-term debt (b) $ 3,065 $ — $ 2,850 $ — $ 3,059 $ — $ 2,701 $ — ______________________________________ (a) Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value. (b) Carrying value represents principal of $3,099 million, net of unamortized debt discounts and issuance costs.

Debt (Tables)

Debt (Tables)	12 Months Ended
Debt (Tables)	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Outstanding	The following is a summary of long-term debt: Maturity December 31, December 31, Title Type Interest Rate Date 2023 2022 (millions) 2029 Notes Senior Notes (a) 4.125% 2029 $ 1,100 $ 1,100 2031 Notes Senior Notes (a) 4.375% 2031 1,000 1,000 2032 Notes Senior Secured Notes (b) 4.300% 2032 600 600 Term Loan Facility Term Loan Facility Variable (c) 2028 399 399 Long-term debt principal 3,099 3,099 Unamortized debt discount (2) (3) Unamortized debt issuance costs (32) (37) Long-term debt, net $ 3,065 $ 3,059 ______________________________ (a) Interest payable semi-annually in arrears each June 15 and December 15. (b) Interest payable semi-annually in arrears each April 15 and October 15.
Schedule of Debt Maturities	The following table presents scheduled debt maturities, excluding any unamortized discount on debt: 2024 2025 2026 2027 2028 and Thereafter Total (millions) Debt maturities $ — — — — 3,099 $ 3,099
Schedule of Availability Under the Revolving Credit Facility	The following table presents the availability under the Revolving Credit Facility: December 31, 2023 (millions) Total availability Revolving Credit Facility, expiring October 2027 $ 1,000 Amounts outstanding Revolving Credit Facility borrowings (a) 165 Letters of credit 16 181 Net availability $ 819 ______________________________ (a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding is 6.72%.
Schedule of Interest Income and Interest Expense	The following table summarizes our interest expense: Year Ended December 31, 2023 2022 2021 (millions) Interest expense $ 170 $ 142 $ 113 Capitalized interest (20) (5) (1) Total interest expense, net $ 150 $ 137 $ 112

Leases (Tables)

Leases (Tables)	12 Months Ended
Leases (Tables)	Dec. 31, 2023
Leases [Abstract]
Schedule of Components of Lease Cost and Other Relevant Information Related to Leases	for the following years includes: Year Ended December 31, 2023 2022 2021 (millions) Operating lease cost $ 20 $ 20 $ 19 Short-term lease cost 3 3 1 $ 23 $ 23 $ 20 Other relevant information related to leases for the following years includes: Year Ended December 31, 2023 2022 2021 Supplemental Cash Flows Information (millions, except years and percentages) Cash paid for amounts included in the measurement of these liabilities: Operating cash flows for operating leases $ 21 $ 18 $ 19 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 25 $ 14 $ 9 Weighted Average Remaining Lease Term Operating leases 4.4 years 4.0 years 4.4 years Weighted Average Discount Rate Operating leases 4.8 % 3.5 % 2.6 %
Schedule of Future Minimum Lease Payments Under Leases	uture minimum lease payments under leases for remaining periods as of December 31, 2023 are as follows: Operating Leases (millions) 2024 $ 15 2025 9 2026 7 2027 7 2028 2 2029 and thereafter 4 Total future minimum lease payments 44 Imputed interest (4) Lease liabilities $ 40
Schedule of Future Minimum Rental Revenues	uture minimum rental revenues for remaining periods as of December 31, 2023 are as follows: Operating Lease (millions) 2024 $ 9 2025 9 2026 9 2027 9 2028 9 2029 and thereafter 88 Total future minimum rental revenues $ 133
Schedule of Property Under Operating Leases	Property under the operating lease is as follows: December 31, 2023 2022 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 15 $ 12

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	12 Months Ended
Commitment and Contingencies (Tables)	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Purchase Commitments	We estimate lifetime purchase commitments of approximately $103 million, due in the periods shown below. (millions) 2024 $ 14 2025 13 2026 12 2027 11 2028 11 2029 and thereafter 42 Total $ 103

Stock-based Compensation and _2

Stock-based Compensation and Defined Contribution Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock-based Compensation Expense	The following table summarizes our stock-based compensation expense and the related income tax benefit: Year Ended December 31, 2023 2022 2021 (millions) Stock-based compensation expense $ 20 $ 17 $ 12 Tax benefit $ 5 $ 4 $ 3
Summary of Restricted Stock Unit Activity	The following table summarizes restricted stock unit activity for the year ended December 31, 2023: Restricted Weighted- Average (thousands) (per share) Nonvested as of December 31, 2022 468 $ 43.28 Granted (a) 103 51.28 Forfeited (5) 47.80 Vested (149) 41.52 Nonvested as of December 31, 2023 417 $ 45.68 _____________________________________ (a) Includes initial grants and dividends reinvested.
Summary of Performance Shares Activity	The following table summarizes performance share award activity for the year ended December 31, 2023: Performance Share Awards Weighted- Average (thousands) (per share) Nonvested as of December 31, 2022 409 $ 56.55 Granted (a) 334 59.02 Forfeited (19) 62.31 Settled (167) 34.83 Nonvested as of December 31, 2023 557 $ 64.36 _____________________________________ (a) Includes initial grants, dividends reinvested and shares added for achievement of final performance objectives on settled awards.

Segment and Related Informati_2

Segment and Related Information (Tables)	12 Months Ended
Segment and Related Information (Tables)	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Inter-segment Billing and Financial Data by Business Segment	Financial data for our business segments follows: Year Ended December 31, 2023 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 377 $ 545 $ — $ 922 Operation and maintenance 55 190 — 245 Depreciation and amortization 69 113 — 182 Taxes other than income 15 13 — 28 Asset (gains) losses and impairments, net (4) — — (4) Operating Income 242 229 — 471 Interest expense 55 95 — 150 Interest income (1) — — (1) Earnings from equity method investees (177) — — (177) Other (income) and expense — (1) — (1) Income Tax Expense 75 29 — 104 Net Income 290 106 — 396 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 278 $ 106 $ — $ 384 Capital expenditures $ 255 $ 517 $ — $ 772 December 31, 2023 Investments in equity method investees $ 1,762 $ — $ — $ 1,762 Goodwill 53 420 — 473 Total Assets $ 4,439 $ 4,543 $ — $ 8,982 Year Ended December 31, 2022 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 339 $ 581 $ — $ 920 Operation and maintenance 54 213 — 267 Depreciation and amortization 63 107 — 170 Taxes other than income 14 14 — 28 Asset (gains) losses and impairments, net (6) (17) — (23) Operating Income 214 264 — 478 Interest expense 57 80 — 137 Interest income (1) (2) — (3) Earnings from equity method investees (150) — — (150) Loss from financing activities 6 7 — 13 Other (income) and expense — (1) — (1) Income Tax Expense 62 38 — 100 Net Income 240 142 — 382 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 228 $ 142 $ — $ 370 Capital expenditures and acquisitions $ 638 $ 252 $ — $ 890 December 31, 2022 Investments in equity method investees $ 2,200 $ — $ — $ 2,200 Goodwill 53 420 — 473 Total Assets $ 4,625 $ 4,208 $ — $ 8,833 Year Ended December 31, 2021 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 307 $ 534 $ (1) $ 840 Operation and maintenance 59 173 (1) 231 Depreciation and amortization 63 103 — 166 Taxes other than income 13 11 — 24 Asset (gains) losses and impairments, net — 17 — 17 Operating Income 172 230 — 402 Interest expense 51 61 — 112 Interest income (1) (3) — (4) Earnings from equity method investees (126) — — (126) Other (income) and expense (3) 1 — (2) Income Tax Expense 62 42 — 104 Net Income 189 129 — 318 Less: Net Income Attributable to Noncontrolling Interests 11 — — 11 Net Income Attributable to DT Midstream $ 178 $ 129 $ — $ 307 Capital expenditures $ 20 $ 120 $ — $ 140 December 31, 2021 Investments in equity method investees $ 1,691 $ — $ — $ 1,691 Goodwill 53 420 — 473 Total Assets $ 4,165 $ 4,001 $ — $ 8,166

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
Related Party Transactions (Tables)	Dec. 31, 2023
Related Party Transactions [Abstract]
Schedule of Transactions with Related Parties	The following is a summary of our balances with related parties: December 31, 2023 2022 (millions) Notes receivable from Vector — long-term $ 4 $ 4 Current Liabilities — Other 1 3 The following is a summary of our transactions with related parties: Year Ended December 31, 2023 2022 2021 (millions) Revenues Pipeline $ — $ — $ 5 Gathering — — 10 Other Costs Interest income — — (5) Interest expense — — 43 Operation and maintenance and Other expense (1) (1) 43 Other Notes receivable (due from) repaid by DTE Energy — — 263 Short-term borrowings (repayment of borrowings) from DTE Energy — — (3,175) Dividend to DTE Energy — — (501) Contributions from DTE Energy — — 110 Non-cash distributions to DTE Energy — — (10)

Description of the Business a_3

Description of the Business and Basis of Presentation - Narrative (Details)			1 Months Ended				12 Months Ended
	Jul. 01, 2021 shares	Jun. 30, 2021 shares	May 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Jun. 30, 2021 shares	Jan. 31, 2021 shares	Dec. 31, 2023 USD ($) segment $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares		Jan. 13, 2021 $ / shares	Dec. 31, 2020 shares
Related Party Transaction [Line Items]
Number of segments \| segment							2
Common stock, par value (in dollars per share) \| $ / shares							$ 0.01	$ 0.01	$ 0.01		$ 0.01
Common stock, shares outstanding (in shares) \| shares		96,732,466			96,732,466		96,971,021	96,754,549
Common stock, shares issued (in shares) \| shares		96,732,466			96,732,466		96,971,021	96,754,549
Preferred stock, shares authorized (in shares) \| shares							50,000,000	50,000,000
Preferred stock, par value (in dollars per share) \| $ / shares							$ 0.01	$ 0.01
Preferred stock, shares outstanding (in shares) \| shares							0	0
Preferred stock, shares issued (in shares) \| shares							0	0
Operation and maintenance							$ 245,000,000	$ 267,000,000	$ 231,000,000
Separation related transaction costs									20,000,000
Amount by which the share of the underlying equity in the net assets exceeds the carrying amount							352,000,000	368,000,000
Undistributed earnings from equity method investments							0	43,000,000
Payments to acquire equity method investments							$ 7,000,000	$ 5,000,000	$ 11,000,000
Common Stock
Related Party Transaction [Line Items]
Issuance of common shares (in shares) \| shares						1,000			1,000	[1]
Common stock, shares outstanding (in shares) \| shares							96,971,000	96,755,000	96,734,000			0
Issuance of common shares to DTE Energy (in shares) \| shares		96,731,466			96,731,466
Related Party
Related Party Transaction [Line Items]
Operation and maintenance									$ 32,000,000
Related Party \| Common Stock
Related Party Transaction [Line Items]
Issuance of common shares (in shares) \| shares	96,732,466								96,731,000	[2]
NEXUS Senior Unsecured Notes \| Senior Notes
Related Party Transaction [Line Items]
Long-term debt issued			$ 750,000,000
Interest Rate			5.52%
Proceeds from issuance of debt			$ 371,000,000
Millennium
Related Party Transaction [Line Items]
Amount by which the share of the underlying equity in the net assets exceeds the carrying amount				$ 343,000,000
Payments to acquire equity method investments				$ 552,000,000
Additional ownership interest acquired				0.2625
Ownership percentage				52.50%			52.50%	52.50%
Variable Interest Entity, Primary Beneficiary, Stonewall Gas Gathering
Related Party Transaction [Line Items]
VIE ownership percentage							85%
Variable Interest Entity, Primary Beneficiary, South Romeo
Related Party Transaction [Line Items]
VIE ownership percentage							50%

[1] Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC. Issuance of common shares to DTE Energy in anticipation of the Separation.

Description of the Business a_4

Description of the Business and Basis of Presentation - Consolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
ASSETS
Cash	$ 56	$ 61
Accounts receivable	154	161
Intangible assets, net	1,968	2,025
Property, plant and equipment, net	4,434	3,806
Goodwill	473	473	$ 473
Total Assets	8,982	8,833	$ 8,166
LIABILITIES
Other noncurrent liabilities	1,203	1,006
Total Liabilities	4,702	4,679
Variable interest entity, primary beneficiary
ASSETS
Cash	13	27
Accounts receivable	10	9
Other current assets	2	3
Intangible assets, net	483	498
Property, plant and equipment, net	391	403
Goodwill	25	25
Total Assets	924	965
LIABILITIES
Accounts payable and other current liabilities	4	4
Other noncurrent liabilities	3	4
Total Liabilities	$ 7	$ 8

Description of the Business a_5

Description of the Business and Basis of Presentation - Equity Method Investees (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 1,762	$ 2,200		$ 1,691
NEXUS
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 900	$ 1,313
% Owned As of	50%	50%
Vector
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 135	$ 135
% Owned As of	40%	40%
Millennium
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 727	$ 752
% Owned As of	52.50%	52.50%	52.50%

Description of the Business a_6

Description of the Business and Basis of Presentation - Summarized Balance Sheet Data (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Current assets	$ 272	$ 262
Current liabilities	434	614
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Current assets	159	198
Non-current assets	4,057	4,160
Current liabilities	208	206
Non-current liabilities	$ 1,177	$ 476

Description of the Business a_7

Description of the Business and Basis of Presentation - Summarized Income Statement Data (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 922	$ 920	$ 840
Net Income	396	382	318
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	823	800	738
Operating expenses	377	396	371
Net Income	$ 392	$ 372	$ 333

Significant Accounting Polici_4

Significant Accounting Policies - Narrative (Details)	3 Months Ended		12 Months Ended
Significant Accounting Policies - Narrative (Details)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2023 USD ($) internal_grade	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Number of internal grades of credit quality \| internal_grade			3
Asset (gains) losses and impairments, net			$ 4,000,000	$ 23,000,000	$ (17,000,000)
Proceeds from sale of notes receivable			$ 0	22,000,000	0
Specific review of probable future collections based on receivable balances, threshold duration			30 days
Uncollectible expense (recovery)			$ 0	0	0
Allowance for expected credit loss related to accounts receivable			0	0
Operation and maintenance			245,000,000	$ 267,000,000	231,000,000
Separation related transaction costs					20,000,000
Related Party
Financing Receivable, Past Due [Line Items]
Operation and maintenance					$ 32,000,000
Past due
Financing Receivable, Past Due [Line Items]
Financing receivables			0
Notes receivable
Financing Receivable, Past Due [Line Items]
Financing receivables on nonaccrual status			$ 0
Asset (gains) losses and impairments, net	$ 17,000,000	$ 19,000,000
Proceeds from sale of notes receivable	$ 22,000,000
Notes receivable \| Minimum
Financing Receivable, Past Due [Line Items]
Period past due			60 days
Notes receivable \| Maximum
Financing Receivable, Past Due [Line Items]
Period past due			120 days
Notes receivable \| Internal grade 1 \| Related Party
Financing Receivable, Past Due [Line Items]
Financing receivable originated prior to 2021			$ 4,000,000

Significant Accounting Polici_5

Significant Accounting Policies - Activity for Financing Receivables Allowance for Expected Credit Loss (Details) - Notes Receivable - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ 0	$ 0	$ 0
Additions: Charged to costs, expenses, and other accounts	0	0	19
Deductions: Current period provision and write-offs charged against allowance	0	0	(19)
Ending balance	$ 0	$ 0	$ 0

Revenue - Disaggregation of Rev

Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 922	$ 920	$ 840
Lease revenue outside scope of Topic 606	7	10	9
Eliminations
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	(1)
Pipeline
Disaggregation of Revenue [Line Items]
Lease revenue outside scope of Topic 606	7	10	9
Pipeline \| Operating segments
Disaggregation of Revenue [Line Items]
Total operating revenues	377	339	307
Gathering \| Operating segments
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 545	$ 581	$ 534

Revenue - Contract Liabilities

Revenue - Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 32	$ 28
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	101	13
Revenue recognized that was included in the balance at the beginning of the period	(4)	(9)
Ending balance	$ 129	$ 32

Revenue - Expected Recognition

Revenue - Expected Recognition of Contract Liabilities (Details) $ in Millions	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 129
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	709
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 18
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 131
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 20
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 138
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 19
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 109
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 18
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 77
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 16
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 52
Remaining performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 38
Remaining performance obligation, expected timing of satisfaction
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 \| Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 202
Remaining performance obligation, expected timing of satisfaction

Revenue - Expected Timing of Pe

Revenue - Expected Timing of Performance Obligation Satisfaction Related to Fixed Consideration (Details) $ in Millions	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 129
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	18
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	20
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	19
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	18
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	16
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	38
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	709
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	131
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	138
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	109
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	77
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	52
Fixed-price Contract \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 202

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Revenue - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Capitalized contract cost, net	$ 18	$ 19
Capitalized contract cost, amortization expense (less than)	1	1	$ 1
Production-related operating expense, recovery	$ 53	$ 65	$ 38

Revenue - Revenue by Major Cust

Revenue - Revenue by Major Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue, Major Customer [Line Items]
Operating revenues	$ 922	$ 920	$ 840
Customer A \| Revenue \| Customer
Revenue, Major Customer [Line Items]
Operating revenues	$ 560	$ 596	$ 563
Percentage of total	60%	65%	67%
Customer B \| Revenue \| Customer
Revenue, Major Customer [Line Items]
Operating revenues			$ 84
Percentage of total			10%

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill	$ 473	$ 473	$ 473
Operating segments \| Pipeline
Goodwill [Line Items]
Goodwill	53	53	53
Operating segments \| Gathering
Goodwill [Line Items]
Goodwill	$ 420	$ 420	$ 420

Property, Plant, and Equipmen_3

Property, Plant, and Equipment and Intangible Assets - Summary of Property, Plant and Equipment by Classification (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 5,282	$ 4,534
Accumulated depreciation	(848)	(728)
Net Property, plant, and equipment	4,434	3,806
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	96	97
Rights of way and easements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 103	103
Rights of way and easements \| Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	25 years
Rights of way and easements \| Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Pipelines and interconnects
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 3,460	2,845
Pipelines and interconnects \| Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	25 years
Pipelines and interconnects \| Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Facilities and processing plants
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 1,234	998
Facilities and processing plants \| Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	7 years
Facilities and processing plants \| Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Wells and well equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 70	70
Wells and well equipment \| Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Wells and well equipment \| Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	70 years
General plant
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 40	32
General plant \| Minimum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	3 years
General plant \| Maximum
Property, Plant and Equipment [Line Items]
Average Estimated Useful Life	40 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 279	$ 389

Property, Plant, and Equipmen_4

Property, Plant, and Equipment and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 2,270	$ 2,270
Accumulated Amortization	(302)	(245)
Net Carrying Value	1,968	2,025
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,252	2,252
Accumulated Amortization	(289)	(233)
Net Carrying Value	1,963	2,019
Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	18	18
Accumulated Amortization	(13)	(12)
Net Carrying Value	$ 5	$ 6
Minimum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Lives	25 years
Minimum \| Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Useful Lives	14 years
Maximum \| Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Lives	40 years
Maximum \| Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Useful Lives	26 years

Property, Plant, and Equipmen_5

Property, Plant, and Equipment and Intangible Assets - Estimated Intangibles Amortization Expense (Details) $ in Millions	Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Abstract]
2024	$ 57
2025	57
2026	57
2027	57
2028	$ 57

Property, Plant, and Equipmen_6

Property, Plant, and Equipment and Intangible Assets - Depreciation and Amortization Expense by Asset Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Property, plant, and equipment	$ 125	$ 113	$ 108
Customer relationships and other intangible assets, net	57	57	58
Depreciation and amortization	$ 182	$ 170	$ 166

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)		12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Jul. 08, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Examination [Line Items]
State rate changes		$ 18,000,000	$ 25,000,000	$ 3,000,000
Deferred tax asset related to federal net operating loss carry-forwards		184,000,000	129,000,000
State and local deferred tax assets related to net operating loss carry-forwards		102,000,000	79,000,000
Unrecognized tax benefits		0	0
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforward, not subject to expiration		97,000,000
Net operating loss carryforward, subject to expiration		$ 5,000,000
Pennsylvania Department of Revenue
Income Tax Examination [Line Items]
State rate changes	$ (25,000,000)		$ 25,000,000

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income Before Income Taxes	$ 500	$ 482	$ 422
Income tax expense at statutory rate	105	101	89
State and local income taxes, net of federal benefit	18	24	17
State tax rate changes	(18)	(25)	(3)
Other, net	(1)	0	1
Income Tax Expense	$ 104	$ 100	$ 104
Effective income tax rate	20.90%	20.70%	24.70%

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax expense
Federal	$ (4)	$ 16	$ 1
State and other income tax	(2)	14	(1)
Total current income taxes	(6)	30	0
Deferred income tax expense
Federal	109	86	85
State and other income tax	1	(16)	19
Total deferred income tax	110	70	104
Income Tax Expense	$ 104	$ 100	$ 104

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax balance components
Property, plant, and equipment	$ (369)	$ (336)
Federal net operating loss carry-forward	184	129
State and local net operating loss carry-forward, net of federal	102	79
Investment in equity method investees and partnerships	(979)	(811)
Other	31	16
Net deferred income tax asset / (liability)	(1,031)	(923)
Total deferred income tax assets and liabilities
Deferred income tax assets	319	234
Deferred income tax liabilities	(1,350)	(1,157)
Net deferred income tax asset / (liability)	$ (1,031)	$ (923)

Earnings Per Share and Divide_3

Earnings Per Share and Dividends - Narrative (Details) - $ / shares		1 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jan. 31, 2021	Dec. 31, 2021		Dec. 31, 2023	Dec. 31, 2022	Jan. 13, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, par value (in dollars per share)				$ 0.01		$ 0.01	$ 0.01	$ 0.01
Common stock, shares outstanding (in shares)	96,732,466	96,732,466				96,971,021	96,754,549
Common stock, shares issued (in shares)	96,732,466	96,732,466				96,971,021	96,754,549
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Issuance of common shares (in shares)			1,000	1,000	[1]
Issuance of common shares to DTE Energy (in shares)	96,731,466	96,731,466
Common stock, shares outstanding (in shares)				96,734,000		96,971,000	96,755,000		0

[1] Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.

Earnings Per Share and Divide_4

Earnings Per Share and Dividends - Reconciliation of Basic and Diluted Earnings Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$ 384	$ 370	$ 307
Average number of common shares outstanding — basic (in shares)	96.9	96.7	96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards (in shares)	0.6	0.5	0.2
Average number of common shares outstanding — diluted (in shares)	97.5	97.2	96.9
Basic earnings per common share (in dollars per share)	$ 3.97	$ 3.83	$ 3.17
Diluted earnings per common share (in dollars per share)	$ 3.94	$ 3.81	$ 3.16

Earnings Per Share and Divide_5

Earnings Per Share and Dividends - Dividends Declared (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended										12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Quarterly Dividend (in dollars per share)	$ 0.69	$ 0.69	$ 0.69	$ 0.69	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 0.60	$ 0.60			$ 1.20
Dividend Amount	$ 67	$ 67	$ 67	$ 67	$ 62	$ 62	$ 62	$ 62	$ 58	$ 58	$ 268	$ 248	$ 116

Fair Value (Details)

Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt principal	$ 3,099	$ 3,099
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	165	330
Long-term debt	3,065	3,059
Carrying Amount \| Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	4	4
Carrying Amount \| Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	36	0
Fair Value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value \| Level 1 \| Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	0	0
Fair Value \| Level 1 \| Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	0
Fair Value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	165	330
Long-term debt	2,850	2,701
Fair Value \| Level 2 \| Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	0	0
Fair Value \| Level 2 \| Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	36	0
Fair Value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings	0	0
Long-term debt	0	0
Fair Value \| Level 3 \| Related Party
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term notes receivable — related party	4	4
Fair Value \| Level 3 \| Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 0	$ 0

Debt - Narrative (Details)

Debt - Narrative (Details)	1 Months Ended		12 Months Ended
Debt - Narrative (Details)	Oct. 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)
Debt Instrument [Line Items]
Issuance of long-term debt, net of discount and issuance costs			$ 0	$ 591,000,000	$ 3,047,000,000
Repayment of long-term debt			$ 0	596,000,000	$ 5,000,000
Debt amendment cost				8,000,000
Maximum consolidated net leverage ratio			3.25
Debt service coverage ratio			8.3
Consolidated net leverage ratio			2.4
Interest coverage ratio			7.8
Performance surety bonds
Debt Instrument [Line Items]
Performance bonds outstanding			$ 23,000,000
Senior Notes
Debt Instrument [Line Items]
Dividend capacity remaining			$ 356,000,000
2029 Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt issued						$ 1,100,000,000
Interest Rate			4.125%
2031 Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt issued						$ 1,000,000,000
Interest Rate			4.375%
2032 Notes \| Senior Notes
Debt Instrument [Line Items]
Long-term debt issued		$ 600,000,000
Interest Rate		4.30%	4.30%
Issuance of long-term debt, net of discount and issuance costs		$ 593,000,000
Term Loan Facility
Debt Instrument [Line Items]
Repayment of long-term debt		593,000,000
Prepayment cost		$ 0
Gain (loss) on extinguishment of debt, before write off of debt issuance cost and debt discount				(9,000,000)
Write-off of unamortized discount and issuance costs				$ 4,000,000
Minimum debt service coverage ratio			1.1
Revolving Credit Facility \| Revolving Credit Facility, expiring October 2027
Debt Instrument [Line Items]
Increase in commitments	$ 250,000,000
Maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000
Fees incurred			$ 6,000,000
Maximum consolidated net leverage ratio			5
Minimum interest coverage ratio			2.5

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Interest expense	$ 170	$ 142	$ 113
Capitalized interest	(20)	(5)	(1)
Interest expense	$ 150	$ 137	$ 112

Debt - Long-term Debt Outstandi

Debt - Long-term Debt Outstanding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Apr. 30, 2022
Debt Instrument [Line Items]
Long-term debt principal	$ 3,099	$ 3,099
Unamortized debt discount	(2)	(3)
Unamortized debt issuance costs	(32)	(37)
Long-term debt, net	$ 3,065	3,059
2029 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.125%
Long-term debt principal	$ 1,100	1,100
2031 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.375%
Long-term debt principal	$ 1,000	1,000
2032 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.30%		4.30%
Long-term debt principal	$ 600	600
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt principal	$ 399	$ 399
Term Loan Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.11%

Debt - Debt Maturities (Details

Debt - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
2024	$ 0
2025	0
2026	0
2027	0
2028 and Thereafter	3,099
Total	$ 3,099	$ 3,099

Debt - Availability Under the R

Debt - Availability Under the Revolving Credit Facility (Details) - Revolving Credit Facility, expiring October 2027 - USD ($) $ in Millions	Dec. 31, 2023	Oct. 31, 2022
Line of Credit Facility [Line Items]
Amounts outstanding	$ 181
Net availability	819
Revolving Credit Facility
Line of Credit Facility [Line Items]
Total availability	1,000	$ 1,000
Amounts outstanding	$ 165
Weighted average interest rate	6.72%
Letters of credit
Line of Credit Facility [Line Items]
Amounts outstanding	$ 16

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Lessor, operating lease term	15 years
Fixed lease income	$ 7	$ 10	$ 9
Depreciation expense associated with property under operating lease	$ 3	$ 3	$ 3
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease term	3 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease term	11 years

Leases - Components of Lease Co

Leases - Components of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease cost	$ 20	$ 20	$ 19
Short-term lease cost	3	3	1
Lease cost	$ 23	$ 23	$ 20

Leases - Other Relevant Informa

Leases - Other Relevant Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$ 21	$ 18	$ 19
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 25	$ 14	$ 9
Weighted Average Remaining Lease Term
Operating leases	4 years 4 months 24 days	4 years	4 years 4 months 24 days
Weighted Average Discount Rate
Operating leases	4.80%	3.50%	2.60%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Leases (Details) $ in Millions	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 15
2025	9
2026	7
2027	7
2028	2
2029 and thereafter	4
Total future minimum lease payments	44
Imputed interest	(4)
Lease liabilities	$ 40

Leases - Future Minimum Rental

Leases - Future Minimum Rental Revenues (Details) $ in Millions	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 9
2025	9
2026	9
2027	9
2028	9
2029 and thereafter	88
Total future minimum rental revenues	$ 133

Leases - Property Under Operati

Leases - Property Under Operating Leases (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Gross property under operating leases	$ 58	$ 58
Accumulated amortization of property under operating leases	$ 15	$ 12

Commitments and Contingencies -

Commitments and Contingencies - Purchase Commitments (Details) $ in Millions	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2024	$ 14
2025	13
2026	12
2027	11
2028	11
2029 and thereafter	42
Total	$ 103

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, revision in estimates	$ 6
Accrued contingent liabilities	13		$ 19
Performance surety bonds
Loss Contingencies [Line Items]
Guarantee value	32
Revolving Term Credit Facility \| Vector
Loss Contingencies [Line Items]
Financing receivables		$ 70
Maximum potential payout under line of credit	$ 53

Stock-based Compensation and _3

Stock-based Compensation and Defined Contribution Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jul. 01, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized limit of common stock (in shares)		6,500,000
Maximum annual increase for authorized common stock (in shares)		1,750,000
Unrecognized compensation cost related to non-vested stock incentive plan arrangements		$ 23
Unrecognized compensation cost related to non-vested stock incentive plan arrangements, period for recognition		1 year 8 months 1 day
Defined contribution plan cost		$ 7	$ 5	$ 3
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Weighted average grant date, fair value, excluding reinvested dividends (in usd per share)		$ 53.74	$ 72.97
Grants (in shares)		334,000		0
Settled (in shares)		(167,000)		0
Intrinsic value settled stock		$ 9	$ 4
Performance Share Awards \| 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan modification, incremental cost	$ 1
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date, fair value, excluding reinvested dividends (in usd per share)		$ 52.66	$ 52.25
Intrinsic value vested stock		$ 8	$ 3.3	$ 0.1
Grants (in shares)		103,000		0
Restricted Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Restricted Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		4 years

Stock-based Compensation and _4

Stock-based Compensation and Defined Contribution Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 20	$ 17	$ 12
Tax benefit	$ 5	$ 4	$ 3

Stock-based Compensation and _5

Stock-based Compensation and Defined Contribution Plans - Restricted Stock Unit and Performance Share Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted- Average Grant Date Fair Value
Settled (in dollars per share)	$ 34.83
Restricted Stock Units
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	468,000
Grants (in shares)	103,000		0
Forfeitures (in shares)	(5,000)
Vested (in shares)	(149,000)
Ending balance (in shares)	417,000	468,000
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 43.28
Grants (in dollars per share)	51.28
Forfeitures (in dollars per share)	47.80
Vested and issued (in dollars per share)	41.52
Ending balance (in dollars per share)	$ 45.68	$ 43.28
Intrinsic value vested stock	$ 8	$ 3.3	$ 0.1
Performance Share Awards
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	409,000
Grants (in shares)	334,000		0
Forfeitures (in shares)	(19,000)
Settled (in shares)	(167,000)		0
Ending balance (in shares)	557,000	409,000
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 56.55
Grants (in dollars per share)	59.02
Forfeitures (in dollars per share)	62.31
Ending balance (in dollars per share)	$ 64.36	$ 56.55

Segment and Related Informati_3

Segment and Related Information - Financial Data for Business Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating revenues	$ 922	$ 920	$ 840
Operation and maintenance	245	267	231
Depreciation and amortization	182	170	166
Taxes other than income	28	28	24
Asset (gains) losses and impairments, net	(4)	(23)	17
Operating Income	471	478	402
Interest expense	150	137	112
Interest income	(1)	(3)	(4)
Earnings from equity method investees	(177)	(150)	(126)
Loss from financing activities	0	13	0
Other (income) and expense	(1)	(1)	(2)
Income Tax Expense	104	100	104
Net Income	396	382	318
Less: Net Income Attributable to Noncontrolling Interests	12	12	11
Net Income Attributable to DT Midstream	384	370	307
Capital expenditures	772	890	140
Investments in equity method investees	1,762	2,200	1,691
Goodwill	473	473	473
Total Assets	8,982	8,833	8,166
Operating segments \| Pipeline
Segment Reporting Information [Line Items]
Operating revenues	377	339	307
Operation and maintenance	55	54	59
Depreciation and amortization	69	63	63
Taxes other than income	15	14	13
Asset (gains) losses and impairments, net	(4)	(6)	0
Operating Income	242	214	172
Interest expense	55	57	51
Interest income	(1)	(1)	(1)
Earnings from equity method investees	(177)	(150)	(126)
Loss from financing activities		6
Other (income) and expense	0	0	(3)
Income Tax Expense	75	62	62
Net Income	290	240	189
Less: Net Income Attributable to Noncontrolling Interests	12	12	11
Net Income Attributable to DT Midstream	278	228	178
Capital expenditures	255	638	20
Investments in equity method investees	1,762	2,200	1,691
Goodwill	53	53	53
Total Assets	4,439	4,625	4,165
Operating segments \| Gathering
Segment Reporting Information [Line Items]
Operating revenues	545	581	534
Operation and maintenance	190	213	173
Depreciation and amortization	113	107	103
Taxes other than income	13	14	11
Asset (gains) losses and impairments, net	0	(17)	17
Operating Income	229	264	230
Interest expense	95	80	61
Interest income	0	(2)	(3)
Earnings from equity method investees	0	0	0
Loss from financing activities		7
Other (income) and expense	(1)	(1)	1
Income Tax Expense	29	38	42
Net Income	106	142	129
Less: Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to DT Midstream	106	142	129
Capital expenditures	517	252	120
Investments in equity method investees	0	0	0
Goodwill	420	420	420
Total Assets	4,543	4,208	4,001
Eliminations
Segment Reporting Information [Line Items]
Operating revenues	0	0	(1)
Operation and maintenance	0	0	(1)
Depreciation and amortization	0	0	0
Taxes other than income	0	0	0
Asset (gains) losses and impairments, net	0	0	0
Operating Income	0	0	0
Interest expense	0	0	0
Interest income	0	0	0
Earnings from equity method investees	0	0	0
Loss from financing activities		0
Other (income) and expense	0	0	0
Income Tax Expense	0	0	0
Net Income	0	0	0
Less: Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to DT Midstream	0	0	0
Capital expenditures	0	0	0
Investments in equity method investees	0	0	0
Goodwill	0	0	0
Total Assets	$ 0	$ 0	$ 0

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Jul. 01, 2021	Jun. 30, 2021	Jan. 31, 2021	Dec. 31, 2021
Common Stock
Related Party Transaction [Line Items]
Issuance of common shares (in shares)			1,000	1,000	[1]
Related Party
Related Party Transaction [Line Items]
Related party interest rate				3.30%
Term of related party agreement				1 year
Repayment of term loan		$ 2,537
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy		$ 9
Related Party \| Common Stock
Related Party Transaction [Line Items]
Issuance of common shares (in shares)	96,732,466			96,731,000	[2]

[1] Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC. Issuance of common shares to DTE Energy in anticipation of the Separation.

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Balances (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Current Liabilities — Other	$ 1	$ 3
Related Party
Related Party Transaction [Line Items]
Notes receivable from Vector — long-term	$ 4	$ 4

Related Party Transactions - _2

Related Party Transactions - Summary of Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Operating revenues	$ 922	$ 920	$ 840
Interest expense	150	137	112
Notes receivable repaid by DTE Energy	0	0	263
Contributions from DTE Energy	0	0	110
Related Party
Related Party Transaction [Line Items]
Interest income	0	0	(5)
Interest expense	0	0	43
Operation and maintenance and Other expense	(1)	(1)	43
Notes receivable repaid by DTE Energy	0	0	263
Repayment of borrowings from DTE Energy	0	0	(3,175)
Dividend to DTE Energy	0	0	(501)
Contributions from DTE Energy	0	0	110
Non-cash distributions to DTE Energy	0	0	(10)
Pipeline \| Related Party
Related Party Transaction [Line Items]
Operating revenues	0	0	5
Gathering \| Related Party
Related Party Transaction [Line Items]
Operating revenues	$ 0	$ 0	$ 10

Subsequent Event (Details)

Subsequent Event (Details) - $ / shares

3 Months Ended

12 Months Ended

Feb. 16, 2024

Dec. 31, 2023

Sep. 30, 2023

Jun. 30, 2023

Mar. 31, 2023

Dec. 31, 2022

Sep. 30, 2022

Jun. 30, 2022

Mar. 31, 2022

Dec. 31, 2021

Sep. 30, 2021

Dec. 31, 2021

Subsequent Event [Line Items]

Dividends declared on common stock (in dollars per share)

$ 0.69

$ 0.64

$ 0.60

$ 1.20

Subsequent Event

Subsequent Event [Line Items]

Dividends declared on common stock (in dollars per share)

$ 0.735