DT Midstream (DTM) 10-K 16 Feb 23 2022 FY Annual report Financial data

Cover

Cover - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2022	Feb. 10, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
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
Entity Shell Company	false
Entity Public Float			$ 4.7
Entity Common Stock, Shares Outstanding		96,888,357
Documents Incorporated by Reference	Certain information in DT Midstream's definitive Proxy Statement for its 2023 Annual Meeting of Common Shareholders to be held May 5, 2023, 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	2022
Document Fiscal Period Focus	FY
Amendment Flag	false

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Firm ID	238
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Detroit, Michigan

Cover_2

Cover - shares	12 Months Ended
	Dec. 31, 2022	Feb. 10, 2023
Cover [Abstract]
Document Type	10-K
Document Period End Date	Dec. 31, 2022
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		96,888,357
Entity Central Index Key	0001842022
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Operating revenues	$ 920	$ 840	$ 754
Operating Expenses
Operation and maintenance	267	231	175
Depreciation and amortization	170	166	152
Taxes other than income	28	24	15
Asset (gains) losses and impairments, net	(23)	17	(2)
Operating Income	478	402	414
Other (Income) and Deductions
Interest expense	137	112	113
Interest income	(3)	(4)	(9)
Earnings from equity method investees	(150)	(126)	(108)
Loss from financing activities	13	0	0
Other (income) and expense	(1)	(2)	(22)
Income Before Income Taxes	482	422	440
Income Tax Expense	100	104	116
Net Income	382	318	324
Less: Net Income Attributable to Noncontrolling Interests	12	11	12
Net Income Attributable to DT Midstream	$ 370	$ 307	$ 312
Basic Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.83	$ 3.17	$ 3.23
Diluted Earnings per Common Share
Net Income Attributable to DT Midstream (in dollars per share)	$ 3.81	$ 3.16	$ 3.23
Weighted Average Common Shares Outstanding
Basic (in shares)	96.7	96.7	96.7
Diluted (in shares)	97.2	96.9	96.7

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 382	$ 318	$ 324
Foreign currency translation and unrealized gain on derivatives, net of tax	0	1	2
Other comprehensive income	0	1	2
Comprehensive income	382	319	326
Less: Comprehensive income attributable to noncontrolling interests	12	11	12
Comprehensive Income Attributable to DT Midstream	$ 370	$ 308	$ 314

Consolidated Statements of Fina

Consolidated Statements of Financial Position - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 61	$ 132
Accounts receivable (net of $— allowance for expected credit loss for each period end)	161	169
Notes receivable
Third party	0	5
Related party	0	4
Deferred property taxes	22	25
Other	18	25
Total Current Assets	262	360
Investments
Investments in equity method investees	2,200	1,691
Property
Property, plant, and equipment	4,534	4,109
Accumulated depreciation	(728)	(619)
Net Property, plant, and equipment	3,806	3,490
Other Assets
Goodwill	473	473
Long-term notes receivable
Third party	0	2
Related party	4	0
Operating lease right-of-use assets	31	36
Intangible assets, net	2,025	2,082
Other	32	32
Total Other Assets	2,565	2,625
Total Assets	8,833	8,166
Current Liabilities
Accounts payable	119	22
Current portion of long-term debt	0	10
Short-term borrowings	330	0
Operating lease liabilities	16	16
Dividends payable	62	58
Interest payable	10	4
Property taxes payable	29	24
Accrued compensation	20	17
Other	28	26
Total Current Liabilities	614	177
Long-Term Debt (net of current portion)	3,059	3,036
Other Liabilities
Deferred income taxes	923	856
Operating lease liabilities	19	21
Other	64	55
Total Other Liabilities	1,006	932
Total liabilities	4,679	4,145
Commitments and Contingencies (Note 12)
Stockholders' Equity/Member's Equity
Preferred stock ($0.01 par value, 50,000,000 shares authorized, and no shares issued or outstanding at December 31, 2022 and 2021)	0	0
Common stock ($0.01 par value, 550,000,000 shares authorized, and 96,754,549 and 96,734,010 shares issued and outstanding at December 31, 2022 and 2021, respectively)	1	1
Additional paid in capital	3,469	3,450
Retained earnings	547	431
Accumulated other comprehensive income (loss)	(10)	(10)
Total DT Midstream Equity	4,007	3,872
Noncontrolling interests	147	149
Total Equity	4,154	4,021
Total Liabilities and Equity	$ 8,833	$ 8,166

Consolidated Statements of Fi_2

Consolidated Statements of Financial Position (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Allowance for expected credit loss	$ 0	$ 0
Stockholders' Equity/Member's 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)	96,754,549	96,734,010
Common stock, shares outstanding (in shares)	96,754,549	96,734,010

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net Income	$ 382	$ 318	$ 324
Adjustments to reconcile Net Income to Net cash and cash equivalents from operating activities:
Depreciation and amortization	170	166	152
Stock-based compensation	17	12	6
Amortization of operating lease right-of-use assets	19	18	17
Deferred income taxes	70	104	111
Earnings from equity method investees	(150)	(126)	(108)
Dividends from equity method investees	181	129	134
Asset (gains) losses and impairments, net	(17)	17	(2)
Loss from financing activities	13	0	0
Changes in assets and liabilities:
Accounts receivable, net	8	(43)	(16)
Accounts payable — third party	7	4	(2)
Accounts payable — related party	0	(10)	1
Other current and noncurrent assets and liabilities	25	(17)	(20)
Net cash and cash equivalents from operating activities	725	572	597
Investing Activities
Plant and equipment expenditures	(338)	(140)	(518)
Proceeds from sale of notes receivable	22	0	0
Distributions from equity method investees	17	9	5
Contributions to equity method investees	(5)	(11)	(35)
Acquisition of additional interest in equity method investee	(552)	0	0
Notes receivable repaid by (due from) DTE Energy	0	263	(146)
Notes receivable — third party and related party	2	0	(20)
Other investing activities	0	2	0
Net cash and cash equivalents from (used for) investing activities	(854)	123	(714)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs	591	3,047	0
Repayment of long-term debt	(596)	(5)	0
Short-term borrowings (repayment of borrowings) from DTE Energy	0	(3,175)	253
Borrowings under the Revolving Credit Facility	370	25	0
Repayment of borrowings under the Revolving Credit Facility	(40)	(25)	0
Payment of Revolving Credit Facility issuance costs	(3)	(7)	0
Acquisition-related deferred payment	0	0	(380)
Repurchase of common stock	(3)	0	0
Distributions to noncontrolling interests	(14)	(16)	(12)
Dividends paid on common stock	(244)	(58)	0
Dividend to DTE Energy	0	(501)	0
Contributions from DTE Energy	0	110	252
Other financing activities	(3)	0	0
Net cash and cash equivalents from (used for) financing activities	58	(605)	113
Net Increase (Decrease) in Cash and Cash Equivalents	(71)	90	(4)
Cash and Cash Equivalents at Beginning of Period	132	42	46
Cash and Cash Equivalents at End of Period	61	132	42
Supplemental disclosure of cash information
Interest, net of interest capitalized	125	103	113
Income taxes	24	3	3
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable and other accruals	$ 99	$ 10	$ 21

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity/Member's Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning Balance (in shares) at Dec. 31, 2019			0
Beginning Balance at Dec. 31, 2019		$ 3,724	$ 0	$ 3,081	$ 501	$ (13)	$ 155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		324			312		12
Distributions to noncontrolling interests		(12)					(12)
Taxes and other adjustments		190		252	(62)
Other comprehensive income, net of tax		2				2
Ending Balance (in shares) at Dec. 31, 2020			0
Ending 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
Distributions to noncontrolling interests		(16)					(16)
Reorganization to C Corporation (in shares)	[1]		1,000
Issuance of common shares to DTE Energy (in shares)	[2]		96,731,000
Issuance of common shares to DTE Energy	[2]	1	$ 1
Dividend to DTE Energy		(501)			(501)
Dividends declared on common stock		(116)			(116)
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		96,734,010	96,734,000
Ending Balance at Dec. 31, 2021		$ 4,021	$ 1	3,450	431	(10)	149
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared on common stock (in dollars per share)		$ 1.20
Common stock, par value (in dollars per share)		$ 0.01
Net Income		$ 382			370		12
Distributions to noncontrolling interests		(14)					(14)
Dividends declared on common stock		(248)			(248)
Stock-based compensation (in shares)			78,000
Stock-based compensation		15		17	(2)
Repurchase of common stock (in shares)			(57,000)
Repurchase of common stock		(3)			(3)
Taxes and other adjustments		1		2	(1)
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]
Dividends declared on common stock (in dollars per share)		$ 2.56
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.[2]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, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 0.60	$ 0.60	$ 2.56	$ 1.20

Description of the Business and

Description of the Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2022
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. The Company provides 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. DT Midstream's Pipeline segment also includes joint venture interests in equity method investees which own and operate interstate pipelines that connect to DT Midstream’s wholly owned assets. DT Midstream’s 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, 2022 and 2021, Consolidated Statements of Changes in Stockholders' Equity/Member's Equity are presented as of December 31, 2022, 2021, and 2020. 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, 2022 and 2021. 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 periods 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, DT Midstream 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 the historical financial position, results of operations, and cash flows of DT Midstream 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 DT Midstream existed as a standalone entity. Certain prior-period amounts have been reclassified to conform to current-year presentation. 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 DT Midstream’s estimates. DT Midstream believes the assumptions underlying these financial statements are reasonable. Cost Allocations Prior to the Separation, DT Midstream received monthly allocations of general corporate expenses from DTE Energy which were classified within the appropriate Consolidated Statements of Operations line item. Operation and maintenance for the year ended December 31, 2021 included approximately $20 million of Separation-related transaction costs for legal, accounting, auditing and other professional services. Effective July 1, 2021, with the completion of the Separation, DT Midstream no longer received corporate allocations from DTE Energy. Corporate allocation amounts from DTE Energy were as follows: Year Ended December 31, 2021 2020 (millions) Operation and maintenance $ 32 $ 29 Other expense — 1 Total DTE Energy corporate allocations $ 32 $ 30 Cash Management DT Midstream's sources of liquidity include cash generated from operations and available borrowings under our Revolving Credit Facility. Prior to the Separation, DT Midstream’s 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, DT Midstream no longer participated in the cash management program and the working capital loan was terminated. Principles of Consolidation DT Midstream consolidates all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-majority owned investments are accounted for using the equity method of accounting when DT Midstream is able to significantly influence the operating policies of the investee. When DT Midstream does 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. DT Midstream eliminates all intercompany balances and transactions. DT Midstream evaluates whether an entity is a VIE whenever reconsideration events occur. DT Midstream consolidates VIEs for which we are the primary beneficiary. If DT Midstream is 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, DT Midstream considers 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. DT Midstream performs ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed. The maximum risk exposure for consolidated VIEs is reflected on DT Midstream’s Consolidated Statements of Financial Position. DT Midstream owns an 85% interest in the Stonewall Gas Gathering VIE and is the primary beneficiary, therefore Stonewall Gas Gathering is consolidated. DT Midstream owns a 50% interest in the South Romeo VIE and is 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, 2022 and 2021. All assets and liabilities of a consolidated VIE are presented where 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. Amounts for consolidated VIEs are as follows: December 31, 2022 2021 (millions) ASSETS (a) Cash $ 27 $ 23 Accounts receivable — third party 9 8 Other current assets 3 3 Intangible assets, net 498 513 Property, plant and equipment, net 403 408 Goodwill 25 25 $ 965 $ 980 LIABILITIES (a) Accounts payable and other current liabilities $ 4 $ 5 Other noncurrent liabilities 4 4 $ 8 $ 9 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities. DT Midstream 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. DT Midstream did not have an ownership interest in the entity and was 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. Amounts for the non-consolidated VIE were as follows: December 31, 2022 2021 (millions) Notes receivable — current $ — $ 5 Notes receivable — noncurrent — 2 Related Parties Transactions between DT Midstream and DTE Energy prior to the Separation, as well as all transactions between DT Midstream and its 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 Investments in non-consolidated affiliates that are not controlled by DT Midstream, but over which we have significant influence, are accounted for using the equity method of accounting. Under the equity method, investments are recorded at historical cost as an asset and adjusted for capital contributions, dividends and distributions received, and the Company's share of the investee's earnings or losses, which are recorded as earnings from equity method investees on the Consolidated Statements of Operations. DT Midstream's equity method investments are periodically evaluated for certain factors that may be indicative of other-than-temporary impairment. As of December 31, 2022 and 2021, DT Midstream’s carrying amounts of investments in equity method investees exceeded our share of the underlying equity in the net assets of the investees by $368 million and $32 million, respectively. The difference will be amortized over the life of the underlying assets. As of December 31, 2022 and 2021, DT Midstream's consolidated retained earnings balance includes undistributed earnings from equity method investments of $43 million and $84 million, respectively. Equity method investees are described below: Investments As of % Owned As of December 31, December 31, Equity Method Investee 2022 2021 2022 2021 (millions) NEXUS $ 1,313 $ 1,348 50% 50% Vector Pipeline 135 136 40% 40% Millennium Pipeline 752 207 52.5% 26.25% Total investments in equity method investees $ 2,200 $ 1,691 On October 7, 2022, DT Midstream closed on the $552 million purchase of an additional 26.25% ownership interest in Millennium Pipeline 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 interests in Millennium Pipeline, and brought DT Midstream's total ownership interest in Millennium Pipeline to 52.50%. DT Midstream accounts for its ownership interest in Millennium Pipeline under the equity method of accounting. Millennium is not a VIE and DT Midstream does not have a controlling interest due to shared control with its partner over all of Millennium's significant business activities. DT Midstream’s carrying amount of the Millennium Pipeline investment exceeded our share of the underlying equity in the net assets of the Millennium Pipeline by $343 million on the acquisition date. The following tables present summarized financial information of DT Midstream's 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, 2022 2021 (millions) Current assets $ 198 $ 201 Non-current assets 4,160 4,300 Current liabilities 206 225 Non-current liabilities $ 476 $ 521 Summarized income statement data is as follows: Year Ended December 31, 2022 2021 2020 (millions) Operating revenues $ 800 $ 738 $ 708 Operating expenses 396 371 381 Net Income $ 372 $ 333 $ 294

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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. DT Midstream regularly monitors the credit quality of its financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. DT Midstream has 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, 2022. As of December 31, 2022, the Notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. DT Midstream ceases 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 principal or interest amounts due will not be collected in accordance with the note's contractual terms. In determining an allowance for expected credit losses for or the write off of notes receivable, DT Midstream considers 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. DT Midstream 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, DT Midstream 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. DT Midstream maintains no continuing involvement with the note receivable. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2022. 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 the years ended December 31, 2022 and 2021, and $(2) million for the year ended December 31, 2020. The following table presents a roll-forward of the activity for DT Midstream's financing receivables' (accounts receivable and notes receivable) 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, 2022. The balance is shown as a deduction from the respective financing receivable's balance in the Consolidated Statements of Financial Position. 2022 2021 2020 Allowance for expected credit loss- Accounts Receivable (millions) Balance at January 1 $ — $ — $ 8 Additions: Charged to costs, expenses, and other accounts — — — Deductions: Current period provision and write-offs charged against allowance — — (8) Balance at December 31 $ — $ — $ — Allowance for expected credit loss- Notes Receivable Balance at January 1 $ — $ — $ — Additions: Charged to costs, expenses, and other accounts — 19 — Deductions: Current period provision and write-offs charged against allowance — (19) — Balance at 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. DT Midstream's 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. Corporate allocations from DTE Energy, including 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 prior to the Separation. 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 Income - Blue Union/LEAP Settlement In the third quarter 2020, DT Midstream reached a post-acquisition settlement with M5 Louisiana Holdings, LLC. The settlement did not relate to the Blue Union/LEAP acquisition price. The proceeds of $20 million are included in Other (income) and expense on the Consolidated Statement of Operations for the year ended December 31, 2020. 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
	Dec. 31, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS Recently Adopted Pronouncements In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting , as amended. Subsequently, in January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) - Scope , as amended. The amendments in these updates provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. Subsequently, in December 2022, the FASB issued ASU No. 2022-06, Deferral of the Sunset Date of Topic 848, which further deferred the sunset date to December 31, 2024. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2024. DT Midstream adopted this standard which did not have a material impact on our Consolidated Financial Statements.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Significant Accounting Policy 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. DT Midstream's 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 DT Midstream sells 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. DT Midstream's 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. DT Midstream has 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. Certain of our Gathering contracts allow for the recovery of production-related operating expenses, which are recorded as revenue and operating expense. Disaggregation of Revenue The following is a summary of revenues disaggregated by segment: Year Ended December 31, 2022 2021 2020 (millions) Pipeline (a) $ 339 $ 307 $ 266 Gathering 581 534 489 Elimination of Inter-segment Revenue — (1) (1) Total operating revenues $ 920 $ 840 $ 754 __________________________________ (a) Includes revenues outside the scope of Topic 606 primarily related to contracts accounted for as leases of $10 million for the year ended December 31, 2022, and $9 million for the years ended December 31, 2021, and 2020. Nature of Services DT Midstream primarily provides 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 transported, gathered or stored, and a deficiency fee for the shortfall between the MVCs and the actual volumes transported, gathered 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 transported, gathered 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 transported, gathered 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 transported, gathered or stored. Contract Liabilities The following is a summary of contract liability activity: 2022 2021 (millions) Balance at January 1 $ 28 $ 23 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 13 8 Revenue recognized that was included in the balance at the beginning of the period (9) (3) Balance at December 31 $ 32 $ 28 The contract liabilities at DT Midstream generally represent amounts paid by customers for which the associated performance obligation has not yet been satisfied. Performance obligations associated with contract liabilities are principally related to customer prepayments. 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, 2022 that are expected to be recognized as revenue in future periods: (millions) 2023 $ 4 2024 4 2025 4 2026 4 2027 5 2028 and thereafter 11 Total $ 32 Transaction Price Allocated to the Remaining Performance Obligations In accordance with optional exemptions available under Topic 606, DT Midstream does 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 DT Midstream's invoices for actual volumes transported, gathered 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, 2022 that are expected to be recognized as revenue in future periods: (millions) 2023 $ 102 2024 88 2025 77 2026 50 2027 33 2028 and thereafter 50 Total $ 400 Costs to Obtain or Fulfill a Contract DTM recognizes an asset from the costs incurred to obtain a contract only if it expects to recover those costs. In addition, the costs to fulfill a contract are capitalized if the costs are specifically identifiable to a 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 as a reduction of revenue on a systematic basis consistent with the pattern of transfer of the services to which such costs relate. As of both December 31, 2022 and 2021, the Company had capitalized costs to obtain or fulfill a contract of $19 million, which are included in other current assets and other noncurrent assets in the accompanying Consolidated Statements of Financial Position. During the year ended December 31, 2022, 2021, and 2020, we recognized $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, 2022, 2021 and 2020. Both Pipeline and Gathering segments provide services to these customers. 2022 2021 2020 Customer Percentage Customer Percentage Customer Percentage Revenue of Total Revenue of Total Revenue of Total Customers: (millions, except percentages) Customer A $ 596 65 % $ 563 67 % $ 227 31 % Customer B * * 84 10 % 84 11 % Customer C * * * * $ 278 37 % *Represents less than 10%

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	GOODWILL DT Midstream has 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, 2022 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, 2022 and 2021. The following is the summary of the carrying amount of goodwill: Year Ended December 31, 2022 2021 (millions) Goodwill $ 473 $ 473

Property, Plant, and Equipment

Property, Plant, and Equipment and Intangible Assets	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 (years) (millions) Property, plant, and equipment Land and other non-depreciable assets N/A $ 97 $ 97 Rights of way and easements 25 to 40 103 103 Pipelines and interconnects 25 to 40 2,845 2,816 Facilities and processing plants 7 to 40 998 976 Wells and well equipment 40 to 70 70 71 General plant 3 to 30 32 23 Construction in progress N/A 389 23 Total Property, plant, and equipment $ 4,534 $ 4,109 Less accumulated depreciation (728) (619) Net Property, plant, and equipment $ 3,806 $ 3,490 Intangible Assets DT Midstream has intangible assets as shown below: December 31, 2022 December 31, 2021 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 $ (233) $ 2,019 $ 2,252 $ (177) $ 2,075 Contract intangibles 14 - 26 years 18 (12) 6 18 (11) 7 Total $ 2,270 $ (245) $ 2,025 $ 2,270 $ (188) $ 2,082 _____________________________________ (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 gas resources in the region. The following table summarizes DT Midstream’s estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2027: 2023 2024 2025 2026 2027 (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, 2022 2021 2020 (millions) Property, plant, and equipment $ 113 $ 108 $ 97 Customer relationships and other intangible assets, net 57 58 55 Total Depreciation and amortization $ 170 $ 166 $ 152

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Significant Accounting Policy – Accounting for Income Taxes The Company records 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 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 it 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 periods 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 DT Midstream 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. As a corporate taxpayer in Pennsylvania and in accordance with tax accounting guidance, DT Midstream recorded a $25 million impact of remeasuring our deferred tax balances to continuing operations (tax expense) in the year ended December 31, 2022. On August 16, 2022, President Biden signed H.R. 5374 ("Inflation Reduction Act" or "IRA") into law. The IRA includes a number of tax, health care, and energy-related provisions, which largely go into effect in tax years after December 31, 2022, and do not have a material impact on our consolidated financial statements for the year ended December 31, 2022. DT Midstream’s total Income Tax Expense varied from the statutory federal income tax rate for the following reasons: Year Ended December 31, 2022 2021 2020 (millions) Income Before Income Taxes $ 482 $ 422 $ 440 Income tax expense at statutory rate 101 89 92 State and local income taxes, net of federal benefit 24 17 25 State legislative rate change (25) (3) — Other, net — 1 (1) Income Tax Expense $ 100 $ 104 $ 116 Effective income tax rate 20.7 % 24.7 % 26.5 % DT Midstream's effective tax rate is lower than 2021 primarily due to the remeasurement of deferred taxes related to state rate changes (discussed above at Tax Legislation ). Components of DT Midstream’s Income Tax Expense were as follows: Year Ended December 31, 2022 2021 2020 (millions) Current income tax expense Federal $ 16 $ 1 $ — State and other income tax 14 (1) 5 Total current income taxes 30 — 5 Deferred income tax expense Federal 86 85 84 State and other income tax (16) 19 27 Total deferred income tax 70 104 111 $ 100 $ 104 $ 116 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 DT Midstream's 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. DT Midstream’s deferred tax assets (liabilities) were comprised of the following: December 31, 2022 2021 (millions) Deferred income tax balance components Property, plant, and equipment $ (336) $ (363) Federal net operating loss carry-forward 129 175 State and local net operating loss carry-forward, net of federal 79 97 Investment in equity method investees and partnerships (811) (774) Other 16 9 Net deferred income tax asset / (liability) $ (923) $ (856) Total deferred income tax assets and liabilities Deferred income tax assets $ 234 $ 288 Deferred income tax liabilities (1,157) (1,144) $ (923) $ (856) DT Midstream has recorded a deferred tax asset related to a federal net operating loss carry-forward of $129 million as of December 31, 2022. 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. DT Midstream has recorded state and local deferred tax assets related to net operating loss carry-forwards of $79 million at December 31, 2022. The state and local net operating loss carry-forwards expire from 2033 through 2040. Uncertain Tax Positions As of December 31, 2022 and 2021, DT Midstream does not have any unrecognized tax benefits. For periods prior to the Separation, DT Midstream was a member of the consolidated tax return of DTE Energy. As of the balance sheet date, DTE Energy’s federal income tax returns for 2021 and subsequent years remains subject to examination by the Internal Revenue Service (IRS). 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
	Dec. 31, 2022
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. Restricted stock units and performance shares, 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 shares do not receive cash dividends, as such, these awards are not considered participating securities. DT Midstream issued 1,000 shares of common stock at $0.01 par value to its parent, a subsidiary of DTE Energy, in January 2021. The DT Midstream 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 DT Midstream's basic and diluted earnings per share calculation: Year Ended December 31, 2022 2021 2020 (millions, except per share amounts) Basic and Diluted Earnings per Common Share Net Income Attributable to DT Midstream $ 370 $ 307 $ 312 Average number of common shares outstanding — basic 96.7 96.7 96.7 Incremental shares attributable to: Average dilutive restricted stock units and performance share awards 0.5 0.2 — Average number of common shares outstanding — diluted 97.2 96.9 96.7 Basic Earnings per Common Share $ 3.83 $ 3.17 $ 3.23 Diluted Earnings per Common Share $ 3.81 $ 3.16 $ 3.23 DT Midstream 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

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2022
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. DT Midstream makes certain assumptions it believes that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. DT Midstream believes it 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. DT Midstream classifies 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 DT Midstream has 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, 2022 December 31, 2021 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Cash equivalents (a) $ — $ — $ — $ — $ 50 $ — $ 50 $ — Short-term notes receivable Third party — — — — 5 — — 5 Related party — — — — 4 — — 4 Long-term notes receivable Third party — — — — 2 — — 2 Related party 4 — — 4 — — — — Long-term debt (b) $ 3,059 $ — $ 2,701 $ — $ 3,046 $ — $ 3,163 $ — ______________________________________ (a) Money market cash equivalents are measured and recorded at fair value on a recurring basis. (b) Includes debt due within one year. Carrying value represents principal of $3,099 million, net of unamortized debt discounts and issuance costs.

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	DEBT Amendment to Credit Agreement On October 19, 2022, DT Midstream 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 SOFR, and incorporated various amendments, including amendments to pricing, guarantee and collateral provisions, that will become effective if DT Midstream receives an investment-grade rating from two of the three credit rating agencies. Debt Issuances On June 9, 2021, DT Midstream issued the senior unsecured notes of $1.1 billion in aggregate principal amount due June 15, 2029 (the "2029 Notes") and $1.0 billion in aggregate principal amount due June 15, 2031 (the "2031 Notes"). In April 2022, DT Midstream issued $600 million in aggregate principal amount of 4.300% senior secured notes due April 2032 (the "2032 Notes"). The 2032 Notes are guaranteed by certain of DT Midstream's subsidiaries and secured by a first priority lien on certain assets of DT Midstream and its subsidiary guarantors that secure DT Midstream's existing credit facilities. The 2032 Notes have a security fall away provision where the collateral securing the notes will be released if DT Midstream receives an investment-grade rating from two of the three credit rating agencies. As part of the issuance of the 2032 Notes, DT Midstream's capitalized debt issuance and discount costs are approximately $4 million and $1 million, respectively. Debt Redemptions DT Midstream 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 on DT Midstream’s Consolidated Statements of Operations for the year ended December 31, 2022. Long-Term Debt DT Midstream's long-term debt outstanding included: Maturity December 31, December 31, Title Type Interest Rate Date 2022 2021 (millions) 2029 Notes Senior Notes (b) 4.125% 2029 $ 1,100 $ 1,100 2031 Notes Senior Notes (b) 4.375% 2031 1,000 1,000 2032 Notes Senior Secured Notes (c) 4.300% 2032 600 — Term Loan Facility Term Loan Facility Variable (a) 2028 399 995 Long-term debt principal 3,099 3,095 Unamortized debt discount (3) (4) Unamortized debt issuance costs (37) (45) Long-term debt due within one year — (10) Long-term debt (net of current portion) $ 3,059 $ 3,036 ______________________________ (a) Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The Term Loan Facility includes $399 million with a one-month LIBOR interest period which ended January 31, 2023. (b) Interest payable semi-annually in arrears each June 15 and December 15. (c) Interest payable semi-annually in arrears each April 15 and October 15. The following table presents the scheduled debt maturities, excluding any unamortized discount on debt: 2023 2024 2025 2026 2027 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, 2022 (millions) Total availability Revolving Credit Facility, expiring October 2027 $ 1,000 Amounts outstanding Revolving Credit Facility borrowings 330 Letters of credit 39 369 Net availability $ 631 Borrowings under the Revolving Credit Facility are used for general corporate purposes, acquisitions including our Millennium Pipeline acquisition, and letter of credit issuances to support DT Midstream's operations and liquidity. The Revolving Credit Facility incurred initial issuance costs of $7 million in 2021 and Credit Agreement amendment costs of $3 million in 2022, which are included net of amortization in Other noncurrent assets on DT Midstream's Consolidated Statements of Financial Position as of December 31, 2022. These costs are being amortized over the extended term of the Revolving Credit Facility. The Credit Agreement covering the Term Loan Facility and Revolving Credit Facility includes financial covenants that DT Midstream must maintain. These covenants restrict the ability of DT Midstream and its 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 its 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. At December 31, 2022, the debt service coverage ratio, the consolidated net leverage ratio and the interest coverage ratio was 6.9 to 1, 3.8 to 1 and 6.3 to 1, respectively, and DT Midstream was 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 2022, the dividend capacity remaining at year end was $200 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, DT Midstream maintains a first lien net leverage ratio that does not exceed 3.25 to 1. DT Midstream maintained such first lien net leverage ratio at December 31, 2022.

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leases	LEASES Lessee Leases at DT Midstream are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease is deemed to exist when DT Midstream has 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 DT Midstream has 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 determined utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease when 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. DT Midstream has leases with non-index-based escalation clauses for fixed dollar or percentage increases. DT Midstream has certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, DT Midstream has 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. DT Midstream has 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. DT Midstream has 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, 2022 2021 2020 (millions) Operating lease cost $ 20 $ 19 $ 18 Short-term lease cost — — 1 $ 20 $ 19 $ 19 DT Midstream has elected not to apply the lease recognition requirements to leases with a term of 12 months or less. Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. Operating and short-term lease costs are recorded to Operation and Maintenance within Operating Expenses in the Consolidated Statement of Operations. Other relevant information related to leases for the following years includes: Year Ended December 31, 2022 2021 2020 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 $ 18 $ 19 $ 18 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 14 $ 9 $ 16 Weighted Average Remaining Lease Term Operating leases 4.0 years 4.4 years 3.2 years Weighted Average Discount Rate Operating leases 3.5 % 2.6 % 2.8 % DT Midstream's future minimum lease payments under leases for remaining periods as of December 31, 2022 are as follows: Operating Leases (millions) 2023 $ 16 2024 9 2025 3 2026 1 2027 1 2028 and thereafter 7 Total future minimum lease payments 37 Imputed interest (2) Lease liabilities $ 35 Lessor DT Midstream leases 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 16 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 is deemed to exist when DT Midstream has 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 DT Midstream has 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. DT Midstream's fixed lease income associated with the operating lease was $10 million for the year ended December 31, 2022 and $9 million for each of the years ended December 31, 2021 and 2020. Fixed lease income is reported in Operating Revenues on DT Midstream's Consolidated Statement of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2022, 2021 and 2020. DT Midstream's future minimum rental revenues for remaining periods as of December 31, 2022 are as follows: Operating Lease (millions) 2023 $ 9 2024 9 2025 9 2026 9 2027 9 2028 and thereafter 96 $ 141 Property under the operating lease for DT Midstream is as follows: December 31, 2022 2021 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 12 $ 9
Leases	LEASES Lessee Leases at DT Midstream are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease is deemed to exist when DT Midstream has 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 DT Midstream has 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 determined utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease when 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. DT Midstream has leases with non-index-based escalation clauses for fixed dollar or percentage increases. DT Midstream has certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, DT Midstream has 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. DT Midstream has 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. DT Midstream has 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, 2022 2021 2020 (millions) Operating lease cost $ 20 $ 19 $ 18 Short-term lease cost — — 1 $ 20 $ 19 $ 19 DT Midstream has elected not to apply the lease recognition requirements to leases with a term of 12 months or less. Operating lease cost includes amortization of operating lease right-of-use assets and other related costs. Operating and short-term lease costs are recorded to Operation and Maintenance within Operating Expenses in the Consolidated Statement of Operations. Other relevant information related to leases for the following years includes: Year Ended December 31, 2022 2021 2020 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 $ 18 $ 19 $ 18 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 14 $ 9 $ 16 Weighted Average Remaining Lease Term Operating leases 4.0 years 4.4 years 3.2 years Weighted Average Discount Rate Operating leases 3.5 % 2.6 % 2.8 % DT Midstream's future minimum lease payments under leases for remaining periods as of December 31, 2022 are as follows: Operating Leases (millions) 2023 $ 16 2024 9 2025 3 2026 1 2027 1 2028 and thereafter 7 Total future minimum lease payments 37 Imputed interest (2) Lease liabilities $ 35 Lessor DT Midstream leases 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 16 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 is deemed to exist when DT Midstream has 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 DT Midstream has 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. DT Midstream's fixed lease income associated with the operating lease was $10 million for the year ended December 31, 2022 and $9 million for each of the years ended December 31, 2021 and 2020. Fixed lease income is reported in Operating Revenues on DT Midstream's Consolidated Statement of Operations. Depreciation expense associated with the property under the operating lease was $3 million for each of the years ended December 31, 2022, 2021 and 2020. DT Midstream's future minimum rental revenues for remaining periods as of December 31, 2022 are as follows: Operating Lease (millions) 2023 $ 9 2024 9 2025 9 2026 9 2027 9 2028 and thereafter 96 $ 141 Property under the operating lease for DT Midstream is as follows: December 31, 2022 2021 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 12 $ 9

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES From time to time, DT Midstream is 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. DT Midstream cannot predict the final disposition of such proceedings. DT Midstream regularly reviews 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 DT Midstream’s business, financial condition and results of operations. Guarantees In certain limited circumstances, DT Midstream enters into contractual guarantees. DT Midstream may guarantee another entity's obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. DT Midstream did not have any guarantees of other parties' obligations as of December 31, 2022. Purchase Commitments As of December 31, 2022, DT Midstream was party to long-term purchase commitments relating to a variety of goods and services required for their business. DT Midstream estimates lifetime purchase commitments of approximately $103 million. (millions) 2023 $ 11 2024 13 2025 12 2026 11 2027 10 2028 and thereafter 46 Total $ 103 Vector Pipeline Line of Credit DT Midstream is the lender under a revolving term credit facility to Vector Pipeline, 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 Pipeline may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payout at December 31, 2022 is USD $52 million. The funding of a loan under the terms of the credit facility is considered remote. Environmental Contingencies In order to comply with certain state environmental regulations, DT Midstream has 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. Slope restoration expenditures are typically capital in nature. As of December 31, 2022 and 2021, DT Midstream had accrued contingent liabilities of $19 million and $20 million, respectively, for future slope restoration expenditures. The accrual is included in Other current liabilities and Other liabilities in the Consolidated Statements of Financial Position. DT Midstream believes the accrued amounts are sufficient to cover estimated future expenditures. Bankruptcies

Stock-based Compensation and De

Stock-based Compensation and Defined Contribution Plans	12 Months Ended
	Dec. 31, 2022
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 and restricted stock units, performance shares, 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 settlement, or by exercise of a stock option, DT Midstream may issue common stock from its 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, 2022 was 4,750,000 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, DT Midstream 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; • DTE Energy settled two-thirds of the 2019 performance share awards and one-third of the 2020 performance share awards; and • Remaining 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, DT Midstream received an allocation of costs from DTE Energy associated with stock-based compensation. Allocated costs for the year ended December 31, 2020 and the first six months of 2021 are included in the table below. No costs were allocated after July 1, 2021. The following table summarizes the components of stock-based compensation for DT Midstream. Year Ended December 31, 2022 2021 2020 (millions) Stock-based compensation expense $ 17 $ 12 $ 6 Tax benefit $ 4 $ 3 $ 2 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 period beginning on the grant date of restricted stock units and ending on the vesting date, the number of restricted stock units granted will increase, assuming full dividend reinvestment on the dividend payment date. The recipient of the 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 DT Midstream's restricted stock unit activity for the year ended December 31, 2022: Restricted Weighted Average (thousands) (per share) Nonvested at December 31, 2021 466 $ 41.60 Granted (a) 91 49.73 Forfeited (20) 43.73 Vested (b) (69) 40.23 Nonvested at December 31, 2022 468 $ 43.28 _____________________________________ (a) Includes initial grants and reinvested dividends. (b) Includes vested, not issued shares of 24 thousand at December 31, 2022. Shares will be issued in first quarter 2023. The weighted-average grant date fair value of restricted stock units granted, excluding reinvested dividends, during 2022 was $52.25. The intrinsic value of restricted stock units vested and issued during the years ended December 31, 2022 and 2021 was $3 million and $0.1 million, respectively. No restricted stock units were granted by DT Midstream during the years ended December 31, 2021 or 2020. Performance Shares 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. DT Midstream accrues performance share compensation expense 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 shares 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 the achievement of certain DT Midstream performance objectives and market conditions. The performance share awards are settled with DT Midstream common stock. Fractional shares are settled in cash. During the period beginning on the grant date of performance share awards and ending on the certification date of the DT Midstream performance objectives, the number of performance shares granted will increase, assuming full dividend reinvestment on the 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 DT Midstream's performance share activity for the year ended December 31, 2022: Performance Shares Weighted Average (thousands) (per share) Nonvested at December 31, 2021 290 $ 40.63 Granted (a) 240 65.64 Forfeited (42) 57.93 Settled (79) 34.89 Nonvested at December 31, 2022 409 $ 56.55 _____________________________________ (a) Includes initial grants, reinvested dividends and shares added for final performance metrics on settled awards. The weighted-average grant date fair value of performance shares granted, excluding reinvested dividends, during 2022 was $72.97. The intrinsic value of performance shares settled during the year ended December 31, 2022 was $4 million. No performance share awards were granted or settled by DT Midstream during the years ended December 31, 2021 or 2020. Unrecognized Compensation Costs As of December 31, 2022, DT Midstream had $21 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 1.85 years. Defined Contribution Plans DT Midstream sponsors defined contribution retirement savings plans, and participation in one of these plans is available to substantially all employees. DT Midstream matches employee contributions up to certain predefined and Internal Revenue Service limits based on eligible compensation and the employee's contribution rate, and contributes additional amounts in lieu of traditional pension and post-employment healthcare benefits. Prior to the Separation, DT Midstream participated in the defined contribution retirement savings plans of DTE Energy. DT Midstream's cost for these plans was $5 million, $3 million and $2 million for the years ended December 31, 2022, 2021 and 2020, respectively.

Segment and Related Information

Segment and Related Information	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Segment and Related Information	SEGMENT AND RELATED INFORMATION DT Midstream sets strategic goals, allocates resources, and evaluates 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 segment also has interests in equity method investees that own and operate interstate natural gas pipelines. The Pipeline segment is engaged in the transportation and storage of natural gas for intermediate and end user customers. 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, 2022, 2021 and 2020. Financial data for DT Midstream's business segments follows: 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 and acquisitions $ 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 Year Ended December 31, 2020 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 266 $ 489 $ (1) $ 754 Operation and maintenance 53 123 (1) 175 Depreciation and amortization 52 100 — 152 Taxes other than income 7 8 — 15 Asset (gains) losses and impairments, net — (2) — (2) Operating Income 154 260 — 414 Interest expense 43 70 — 113 Interest income (4) (5) — (9) Earnings from equity method investees (108) — — (108) Other (income) and expense (2) (20) — (22) Income Tax Expense 58 58 — 116 Net Income 167 157 — 324 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 155 $ 157 $ — $ 312 Capital expenditures and acquisitions $ 350 $ 168 $ — $ 518 December 31, 2020 Investments in equity method investees $ 1,691 $ — $ — $ 1,691 Goodwill 53 420 — 473 Total Assets $ 4,343 $ 3,999 $ — $ 8,342

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2022
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 its 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 DT Midstream’s facilities. DT Midstream 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 interest rates of 3.3% for 2021 and 3.9% for 2020 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, DT Midstream 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 DT Midstream's balances with related parties: December 31, 2022 2021 (millions) Notes receivable from Vector — current $ — $ 4 Notes receivable from Vector — long-term 4 — Current Liabilities — Other 3 3 The following is a summary of DT Midstream’s transactions with related parties: Year Ended December 31, 2022 2021 2020 (millions) Revenues Pipeline $ — $ 5 $ 16 Gathering — 10 10 Other Costs Interest income — (5) (6) Interest expense — 43 110 Operation and maintenance and Other expense (1) 43 54 Other Notes receivable (due from) repaid by DTE Energy — 263 (146) Short-term borrowings (repayment of borrowings) from DTE Energy — (3,175) 253 Dividend to DTE Energy — (501) — Contributions from DTE Energy — 110 252 Non-cash distributions to DTE Energy — (10) (62)

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2022
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENT Dividend Declaration On February 16, 2023, DT Midstream announced that DT Midstream's Board of Directors declared a quarterly dividend of $0.69 per share of common stock. The dividend is payable to DT Midstream's stockholders of record as of March 20, 2023 and is expected to be paid on April 15, 2023.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Consolidated Financial Statements and Notes to Consolidated Financial Statements as of and for periods 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, DT Midstream 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 the historical financial position, results of operations, and cash flows of DT Midstream 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 DT Midstream existed as a standalone entity. Certain prior-period amounts have been reclassified to conform to current-year presentation. 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 DT Midstream’s estimates. DT Midstream believes the assumptions underlying these financial statements are reasonable.
Principles of Consolidation	Principles of Consolidation DT Midstream consolidates all majority-owned subsidiaries and investments in entities in which we have a controlling influence. Non-majority owned investments are accounted for using the equity method of accounting when DT Midstream is able to significantly influence the operating policies of the investee. When DT Midstream does 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. DT Midstream eliminates all intercompany balances and transactions. DT Midstream evaluates whether an entity is a VIE whenever reconsideration events occur. DT Midstream consolidates VIEs for which we are the primary beneficiary. If DT Midstream is 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, DT Midstream considers 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. DT Midstream performs ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed. The maximum risk exposure for consolidated VIEs is reflected on DT Midstream’s Consolidated Statements of Financial Position. DT Midstream owns an 85% interest in the Stonewall Gas Gathering VIE and is the primary beneficiary, therefore Stonewall Gas Gathering is consolidated. DT Midstream owns a 50% interest in the South Romeo VIE and is the primary beneficiary, therefore South Romeo is consolidated.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash 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 Financing receivables are primarily composed of trade accounts receivable and notes receivable, which are stated at net realizable value. DT Midstream regularly monitors the credit quality of its financing receivables by reviewing counterparty credit quality indicators and monitoring for triggering events, such as a credit rating downgrade or bankruptcy. DT Midstream has 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, 2022. As of December 31, 2022, the Notes receivable — related party of $4 million, which originated prior to 2021, was classified as internal grade 1. Notes receivable are typically considered delinquent (past due) when payment is not received for periods ranging from 60 to 120 days. DT Midstream ceases 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 principal or interest amounts due will not be collected in accordance with the note's contractual terms. In determining an allowance for expected credit losses for or the write off of notes receivable, DT Midstream considers 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. DT Midstream 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, DT Midstream 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. DT Midstream maintains no continuing involvement with the note receivable. There are no notes receivable on nonaccrual status and no past due financing receivables as of December 31, 2022.
Recently Issued Pronouncements	Recently Adopted Pronouncements In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting , as amended. Subsequently, in January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848) - Scope , as amended. The amendments in these updates provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. Subsequently, in December 2022, the FASB issued ASU No. 2022-06, Deferral of the Sunset Date of Topic 848, which further deferred the sunset date to December 31, 2024. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2024. DT Midstream adopted this standard which did not have a material impact on our Consolidated Financial Statements.
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. DT Midstream's 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 DT Midstream sells 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. DT Midstream's 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. DT Midstream has 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. Certain of our Gathering contracts allow for the recovery of production-related operating expenses, which are recorded as revenue and operating expense.
Income Taxes	Significant Accounting Policy – Accounting for Income Taxes The Company records 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 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.
Lessor	Lessor DT Midstream leases 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 16 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 is deemed to exist when DT Midstream has 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 DT Midstream has 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.
Lessee	Lessee Leases at DT Midstream are primarily comprised of equipment and buildings with terms ranging from approximately 3 to 11 years. A lease is deemed to exist when DT Midstream has 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 DT Midstream has 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 determined utilizing a discount rate to determine the present values of lease payments. GAAP requires the use of the rate implicit in the lease when 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. DT Midstream has leases with non-index-based escalation clauses for fixed dollar or percentage increases. DT Midstream has certain leases which contain purchase options. Based upon the nature of the leased property and terms of the purchase options, DT Midstream has 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. DT Midstream has 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. DT Midstream has 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.
Property, Plant, and Equipment	Property, Plant, and EquipmentProperty is stated at cost and includes construction-related labor, materials, and overhead. Expenditures for maintenance and repairs are charged to expense when incurred. DT Midstream's property, plant and equipment is depreciated over its estimated useful life using the straight-line method.
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.
Depreciation and Amortization	Depreciation and AmortizationDepreciation 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.

Description of the Business a_2

Description of the Business and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Corporate Allocations	Corporate allocation amounts from DTE Energy were as follows: Year Ended December 31, 2021 2020 (millions) Operation and maintenance $ 32 $ 29 Other expense — 1 Total DTE Energy corporate allocations $ 32 $ 30 The following is a summary of DT Midstream's balances with related parties: December 31, 2022 2021 (millions) Notes receivable from Vector — current $ — $ 4 Notes receivable from Vector — long-term 4 — Current Liabilities — Other 3 3 The following is a summary of DT Midstream’s transactions with related parties: Year Ended December 31, 2022 2021 2020 (millions) Revenues Pipeline $ — $ 5 $ 16 Gathering — 10 10 Other Costs Interest income — (5) (6) Interest expense — 43 110 Operation and maintenance and Other expense (1) 43 54 Other Notes receivable (due from) repaid by DTE Energy — 263 (146) Short-term borrowings (repayment of borrowings) from DTE Energy — (3,175) 253 Dividend to DTE Energy — (501) — Contributions from DTE Energy — 110 252 Non-cash distributions to DTE Energy — (10) (62)
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, 2022 and 2021. All assets and liabilities of a consolidated VIE are presented where 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. Amounts for consolidated VIEs are as follows: December 31, 2022 2021 (millions) ASSETS (a) Cash $ 27 $ 23 Accounts receivable — third party 9 8 Other current assets 3 3 Intangible assets, net 498 513 Property, plant and equipment, net 403 408 Goodwill 25 25 $ 965 $ 980 LIABILITIES (a) Accounts payable and other current liabilities $ 4 $ 5 Other noncurrent liabilities 4 4 $ 8 $ 9 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities. Amounts for the non-consolidated VIE were as follows: December 31, 2022 2021 (millions) Notes receivable — current $ — $ 5 Notes receivable — noncurrent — 2
Schedule of Equity Method Investments	Equity method investees are described below: Investments As of % Owned As of December 31, December 31, Equity Method Investee 2022 2021 2022 2021 (millions) NEXUS $ 1,313 $ 1,348 50% 50% Vector Pipeline 135 136 40% 40% Millennium Pipeline 752 207 52.5% 26.25% Total investments in equity method investees $ 2,200 $ 1,691 The following tables present summarized financial information of DT Midstream's 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, 2022 2021 (millions) Current assets $ 198 $ 201 Non-current assets 4,160 4,300 Current liabilities 206 225 Non-current liabilities $ 476 $ 521 Summarized income statement data is as follows: Year Ended December 31, 2022 2021 2020 (millions) Operating revenues $ 800 $ 738 $ 708 Operating expenses 396 371 381 Net Income $ 372 $ 333 $ 294

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Schedule of Roll-Forward of Activity for Financing Receivables Allowance for Expected Credit Loss	The following table presents a roll-forward of the activity for DT Midstream's financing receivables' (accounts receivable and notes receivable) 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, 2022. The balance is shown as a deduction from the respective financing receivable's balance in the Consolidated Statements of Financial Position. 2022 2021 2020 Allowance for expected credit loss- Accounts Receivable (millions) Balance at January 1 $ — $ — $ 8 Additions: Charged to costs, expenses, and other accounts — — — Deductions: Current period provision and write-offs charged against allowance — — (8) Balance at December 31 $ — $ — $ — Allowance for expected credit loss- Notes Receivable Balance at January 1 $ — $ — $ — Additions: Charged to costs, expenses, and other accounts — 19 — Deductions: Current period provision and write-offs charged against allowance — (19) — Balance at December 31 $ — $ — $ —
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
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following is a summary of revenues disaggregated by segment: Year Ended December 31, 2022 2021 2020 (millions) Pipeline (a) $ 339 $ 307 $ 266 Gathering 581 534 489 Elimination of Inter-segment Revenue — (1) (1) Total operating revenues $ 920 $ 840 $ 754 __________________________________ (a) Includes revenues outside the scope of Topic 606 primarily related to contracts accounted for as leases of $10 million for the year ended December 31, 2022, and $9 million for the years ended December 31, 2021, and 2020.
Summary of Contact Liability Activity	The following is a summary of contract liability activity: 2022 2021 (millions) Balance at January 1 $ 28 $ 23 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 13 8 Revenue recognized that was included in the balance at the beginning of the period (9) (3) Balance at December 31 $ 32 $ 28
Revenue Expected to be Recognized in Future Periods	The following table presents contract liability amounts as of December 31, 2022 that are expected to be recognized as revenue in future periods: (millions) 2023 $ 4 2024 4 2025 4 2026 4 2027 5 2028 and thereafter 11 Total $ 32 The following table presents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of December 31, 2022 that are expected to be recognized as revenue in future periods: (millions) 2023 $ 102 2024 88 2025 77 2026 50 2027 33 2028 and thereafter 50 Total $ 400
Schedule of Revenue by Major Customers	The following table summarizes customers which represent 10% or more of our total revenue for the years ended December 31, 2022, 2021 and 2020. Both Pipeline and Gathering segments provide services to these customers. 2022 2021 2020 Customer Percentage Customer Percentage Customer Percentage Revenue of Total Revenue of Total Revenue of Total Customers: (millions, except percentages) Customer A $ 596 65 % $ 563 67 % $ 227 31 % Customer B * * 84 10 % 84 11 % Customer C * * * * $ 278 37 % *Represents less than 10%

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following is the summary of the carrying amount of goodwill: Year Ended December 31, 2022 2021 (millions) Goodwill $ 473 $ 473

Property, Plant, and Equipmen_2

Property, Plant, and Equipment and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 2021 (years) (millions) Property, plant, and equipment Land and other non-depreciable assets N/A $ 97 $ 97 Rights of way and easements 25 to 40 103 103 Pipelines and interconnects 25 to 40 2,845 2,816 Facilities and processing plants 7 to 40 998 976 Wells and well equipment 40 to 70 70 71 General plant 3 to 30 32 23 Construction in progress N/A 389 23 Total Property, plant, and equipment $ 4,534 $ 4,109 Less accumulated depreciation (728) (619) Net Property, plant, and equipment $ 3,806 $ 3,490
Schedule of Intangible Assets	DT Midstream has intangible assets as shown below: December 31, 2022 December 31, 2021 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 $ (233) $ 2,019 $ 2,252 $ (177) $ 2,075 Contract intangibles 14 - 26 years 18 (12) 6 18 (11) 7 Total $ 2,270 $ (245) $ 2,025 $ 2,270 $ (188) $ 2,082 _____________________________________
Schedule of Estimated Intangibles Assets Amortization Expense	The following table summarizes DT Midstream’s estimated customer relationships and contract intangibles amortization expense to be recognized during each year through 2027: 2023 2024 2025 2026 2027 (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, 2022 2021 2020 (millions) Property, plant, and equipment $ 113 $ 108 $ 97 Customer relationships and other intangible assets, net 57 58 55 Total Depreciation and amortization $ 170 $ 166 $ 152

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rate Reconciliation	DT Midstream’s total Income Tax Expense varied from the statutory federal income tax rate for the following reasons: Year Ended December 31, 2022 2021 2020 (millions) Income Before Income Taxes $ 482 $ 422 $ 440 Income tax expense at statutory rate 101 89 92 State and local income taxes, net of federal benefit 24 17 25 State legislative rate change (25) (3) — Other, net — 1 (1) Income Tax Expense $ 100 $ 104 $ 116 Effective income tax rate 20.7 % 24.7 % 26.5 %
Schedule of Income Tax Expense	Components of DT Midstream’s Income Tax Expense were as follows: Year Ended December 31, 2022 2021 2020 (millions) Current income tax expense Federal $ 16 $ 1 $ — State and other income tax 14 (1) 5 Total current income taxes 30 — 5 Deferred income tax expense Federal 86 85 84 State and other income tax (16) 19 27 Total deferred income tax 70 104 111 $ 100 $ 104 $ 116
Schedule of Deferred Tax Assets (Liabilities)	DT Midstream’s deferred tax assets (liabilities) were comprised of the following: December 31, 2022 2021 (millions) Deferred income tax balance components Property, plant, and equipment $ (336) $ (363) Federal net operating loss carry-forward 129 175 State and local net operating loss carry-forward, net of federal 79 97 Investment in equity method investees and partnerships (811) (774) Other 16 9 Net deferred income tax asset / (liability) $ (923) $ (856) Total deferred income tax assets and liabilities Deferred income tax assets $ 234 $ 288 Deferred income tax liabilities (1,157) (1,144) $ (923) $ (856)

Earnings Per Share and Divide_2

Earnings Per Share and Dividends (Tables)	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share	The following is a reconciliation of DT Midstream's basic and diluted earnings per share calculation: Year Ended December 31, 2022 2021 2020 (millions, except per share amounts) Basic and Diluted Earnings per Common Share Net Income Attributable to DT Midstream $ 370 $ 307 $ 312 Average number of common shares outstanding — basic 96.7 96.7 96.7 Incremental shares attributable to: Average dilutive restricted stock units and performance share awards 0.5 0.2 — Average number of common shares outstanding — diluted 97.2 96.9 96.7 Basic Earnings per Common Share $ 3.83 $ 3.17 $ 3.23 Diluted Earnings per Common Share $ 3.81 $ 3.16 $ 3.23
Schedule of Cash Dividends Declared	DT Midstream 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

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 December 31, 2021 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Cash equivalents (a) $ — $ — $ — $ — $ 50 $ — $ 50 $ — Short-term notes receivable Third party — — — — 5 — — 5 Related party — — — — 4 — — 4 Long-term notes receivable Third party — — — — 2 — — 2 Related party 4 — — 4 — — — — Long-term debt (b) $ 3,059 $ — $ 2,701 $ — $ 3,046 $ — $ 3,163 $ — ______________________________________ (a) Money market cash equivalents are measured and recorded at fair value on a recurring basis. (b) Includes debt due within one year. Carrying value represents principal of $3,099 million, net of unamortized debt discounts and issuance costs.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt Outstanding	DT Midstream's long-term debt outstanding included: Maturity December 31, December 31, Title Type Interest Rate Date 2022 2021 (millions) 2029 Notes Senior Notes (b) 4.125% 2029 $ 1,100 $ 1,100 2031 Notes Senior Notes (b) 4.375% 2031 1,000 1,000 2032 Notes Senior Secured Notes (c) 4.300% 2032 600 — Term Loan Facility Term Loan Facility Variable (a) 2028 399 995 Long-term debt principal 3,099 3,095 Unamortized debt discount (3) (4) Unamortized debt issuance costs (37) (45) Long-term debt due within one year — (10) Long-term debt (net of current portion) $ 3,059 $ 3,036 ______________________________ (a) Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The Term Loan Facility includes $399 million with a one-month LIBOR interest period which ended January 31, 2023. (b) Interest payable semi-annually in arrears each June 15 and December 15. (c) Interest payable semi-annually in arrears each April 15 and October 15.
Schedule of Availability Under the Revolving Credit Facility	The following table presents the availability under the Revolving Credit Facility: December 31, 2022 (millions) Total availability Revolving Credit Facility, expiring October 2027 $ 1,000 Amounts outstanding Revolving Credit Facility borrowings 330 Letters of credit 39 369 Net availability $ 631

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Schedule of Components of Lease Cost and Other Relevant Information Related to Leases	The components of lease cost for the following years includes: Year Ended December 31, 2022 2021 2020 (millions) Operating lease cost $ 20 $ 19 $ 18 Short-term lease cost — — 1 $ 20 $ 19 $ 19 Other relevant information related to leases for the following years includes: Year Ended December 31, 2022 2021 2020 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 $ 18 $ 19 $ 18 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 14 $ 9 $ 16 Weighted Average Remaining Lease Term Operating leases 4.0 years 4.4 years 3.2 years Weighted Average Discount Rate Operating leases 3.5 % 2.6 % 2.8 %
Schedule of Future Minimum Lease Payments Under Leases	DT Midstream's future minimum lease payments under leases for remaining periods as of December 31, 2022 are as follows: Operating Leases (millions) 2023 $ 16 2024 9 2025 3 2026 1 2027 1 2028 and thereafter 7 Total future minimum lease payments 37 Imputed interest (2) Lease liabilities $ 35
Schedule of Future Minimum Rental Revenues	DT Midstream's future minimum rental revenues for remaining periods as of December 31, 2022 are as follows: Operating Lease (millions) 2023 $ 9 2024 9 2025 9 2026 9 2027 9 2028 and thereafter 96 $ 141
Schedule of Property Under Operating Leases	Property under the operating lease for DT Midstream is as follows: December 31, 2022 2021 (millions) Gross property under operating leases $ 58 $ 58 Accumulated amortization of property under operating leases $ 12 $ 9

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Schedule of Purchase Commitments	(millions) 2023 $ 11 2024 13 2025 12 2026 11 2027 10 2028 and thereafter 46 Total $ 103

Stock-based Compensation and _2

Stock-based Compensation and Defined Contribution Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Stock-based Compensation Expense	The following table summarizes the components of stock-based compensation for DT Midstream. Year Ended December 31, 2022 2021 2020 (millions) Stock-based compensation expense $ 17 $ 12 $ 6 Tax benefit $ 4 $ 3 $ 2
Summary of Restricted Stock Unit Activity	The following table summarizes DT Midstream's restricted stock unit activity for the year ended December 31, 2022: Restricted Weighted Average (thousands) (per share) Nonvested at December 31, 2021 466 $ 41.60 Granted (a) 91 49.73 Forfeited (20) 43.73 Vested (b) (69) 40.23 Nonvested at December 31, 2022 468 $ 43.28 _____________________________________ (a) Includes initial grants and reinvested dividends. (b) Includes vested, not issued shares of 24 thousand at December 31, 2022. Shares will be issued in first quarter 2023.
Summary of Performance Shares Activity	The following table summarizes DT Midstream's performance share activity for the year ended December 31, 2022: Performance Shares Weighted Average (thousands) (per share) Nonvested at December 31, 2021 290 $ 40.63 Granted (a) 240 65.64 Forfeited (42) 57.93 Settled (79) 34.89 Nonvested at December 31, 2022 409 $ 56.55 _____________________________________ (a) Includes initial grants, reinvested dividends and shares added for final performance metrics on settled awards.

Segment and Related Informati_2

Segment and Related Information (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of Inter-segment Billing and Financial Data by Business Segment	Financial data for DT Midstream's business segments follows: 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 and acquisitions $ 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 Year Ended December 31, 2020 Pipeline Gathering Eliminations Total (millions) Operating revenues $ 266 $ 489 $ (1) $ 754 Operation and maintenance 53 123 (1) 175 Depreciation and amortization 52 100 — 152 Taxes other than income 7 8 — 15 Asset (gains) losses and impairments, net — (2) — (2) Operating Income 154 260 — 414 Interest expense 43 70 — 113 Interest income (4) (5) — (9) Earnings from equity method investees (108) — — (108) Other (income) and expense (2) (20) — (22) Income Tax Expense 58 58 — 116 Net Income 167 157 — 324 Less: Net Income Attributable to Noncontrolling Interests 12 — — 12 Net Income Attributable to DT Midstream $ 155 $ 157 $ — $ 312 Capital expenditures and acquisitions $ 350 $ 168 $ — $ 518 December 31, 2020 Investments in equity method investees $ 1,691 $ — $ — $ 1,691 Goodwill 53 420 — 473 Total Assets $ 4,343 $ 3,999 $ — $ 8,342

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2022
Related Party Transactions [Abstract]
Schedule of Transactions with Related Parties	Corporate allocation amounts from DTE Energy were as follows: Year Ended December 31, 2021 2020 (millions) Operation and maintenance $ 32 $ 29 Other expense — 1 Total DTE Energy corporate allocations $ 32 $ 30 The following is a summary of DT Midstream's balances with related parties: December 31, 2022 2021 (millions) Notes receivable from Vector — current $ — $ 4 Notes receivable from Vector — long-term 4 — Current Liabilities — Other 3 3 The following is a summary of DT Midstream’s transactions with related parties: Year Ended December 31, 2022 2021 2020 (millions) Revenues Pipeline $ — $ 5 $ 16 Gathering — 10 10 Other Costs Interest income — (5) (6) Interest expense — 43 110 Operation and maintenance and Other expense (1) 43 54 Other Notes receivable (due from) repaid by DTE Energy — 263 (146) Short-term borrowings (repayment of borrowings) from DTE Energy — (3,175) 253 Dividend to DTE Energy — (501) — Contributions from DTE Energy — 110 252 Non-cash distributions to DTE Energy — (10) (62)

Description of the Business a_3

Description of the Business and Basis of Presentation (Details Textuals) $ / shares in Units, $ in Millions					1 Months Ended	12 Months Ended
	Oct. 07, 2022 USD ($)	Jul. 01, 2021 shares	Jun. 30, 2021 shares	Jan. 13, 2021 $ / shares shares	Jun. 30, 2021 shares	Dec. 31, 2022 USD ($) segment $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares		Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 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
Common stock, shares issued (in shares)			96,732,466		96,732,466	96,754,549	96,734,010
Common stock, shares outstanding (in shares)			96,732,466		96,732,466	96,754,549	96,734,010
Preferred stock, shares authorized (in shares)						50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)						0	0
Preferred stock, shares outstanding (in shares)						0	0
Separation related transaction costs | $							$ 20
Amount by which the share of the underlying equity in the net assets exceeds the carrying amount | $						$ 368	32
Undistributed earnings from equity method investments | $						43	84
Payments to acquire equity method investments | $						$ 5	$ 11		$ 35
Millennium Pipeline
Related Party Transaction [Line Items]
Amount by which the share of the underlying equity in the net assets exceeds the carrying amount | $	$ 343
Payments to acquire equity method investments | $	$ 552
Additional ownership interest acquired	0.2625
Ownership percentage	52.50%					52.50%	26.25%
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%
Common Stock
Related Party Transaction [Line Items]
Common stock, shares issued (in shares)				1,000			1,000	[1]
Issuance of common shares to DTE Energy (in shares)			96,731,466		96,731,466		96,731,000	[2]
Common stock, shares outstanding (in shares)						96,755,000	96,734,000		0	0
Distribution of shares (in shares)		96,732,466
[1]Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.[2]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 (Cost Allocations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Operation and maintenance	$ 267	$ 231	$ 175
Affiliated entity
Related Party Transaction [Line Items]
Operation and maintenance		32	29
Other expense		0	1
Total DTE Energy corporate allocations		$ 32	$ 30

Description of the Business a_5

Description of the Business and Basis of Presentation (Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash	$ 61	$ 132
Accounts receivable — third party	161	169
Other current assets	18	25
Intangible assets, net	2,025	2,082
Property, plant and equipment, net	3,806	3,490
Goodwill	473	473	$ 473
Total Assets	8,833	8,166	$ 8,342
LIABILITIES
Other noncurrent liabilities	1,006	932
Total liabilities	4,679	4,145
Variable interest entity, primary beneficiary
ASSETS
Cash	27	23
Accounts receivable — third party	9	8
Other current assets	3	3
Intangible assets, net	498	513
Property, plant and equipment, net	403	408
Goodwill	25	25
Total Assets	965	980
LIABILITIES
Accounts payable and other current liabilities	4	5
Other noncurrent liabilities	4	4
Total liabilities	$ 8	$ 9

Description of the Business a_6

Description of the Business and Basis of Presentation (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Notes receivable — current	$ 0	$ 5
Notes receivable — noncurrent	0	2
Variable interest entity, non-consolidated
Variable Interest Entity [Line Items]
Notes receivable — current	0	5
Notes receivable — noncurrent	$ 0	$ 2

Description of the Business a_7

Description of the Business and Basis of Presentation (Equity Method Investees) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Oct. 07, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 2,200		$ 1,691	$ 1,691
NEXUS
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 1,313		$ 1,348
% Owned As of	50%		50%
Vector Pipeline
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 135		$ 136
% Owned As of	40%		40%
Millennium Pipeline
Schedule of Equity Method Investments [Line Items]
Investments As of	$ 752		$ 207
% Owned As of	52.50%	52.50%	26.25%

Description of the Business a_8

Description of the Business and Basis of Presentation (Financial Information of Non-Consolidated Subsidiaries) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Summarized income statement data
Current assets	$ 262	$ 360
Current liabilities	614	177
Equity method investment, non-consolidated investees
Summarized income statement data
Current assets	198	201
Non-current assets	4,160	4,300
Current liabilities	206	225
Non-current liabilities	$ 476	$ 521

Description of the Business a_9

Description of the Business and Basis of Presentation (Summarized Income Statement Data) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 920	$ 840	$ 754
Net Income	382	318	324
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	800	738	708
Operating expenses	396	371	381
Net Income	$ 372	$ 333	$ 294

Significant Accounting Polici_4

Significant Accounting Policies (Details Textuals)		3 Months Ended		12 Months Ended
	Jul. 08, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) internal_grade	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items]
Number of internal grades of credit quality | internal_grade				3
Asset (gains) losses and impairments, net				$ 23,000,000	$ (17,000,000)	$ 2,000,000
Proceeds from sale of notes receivable				$ 22,000,000	0	0
Specific review of probable future collections based on receivable balances, threshold duration				30 days
Uncollectible expense (recovery)				$ 0	0	(2,000,000)
Allowance for expected credit loss related to accounts receivable				0
Settlement proceeds				1,000,000	2,000,000	22,000,000
State legislative rate change				(25,000,000)	$ (3,000,000)	0
Pennsylvania Department Of Revenue
Financing Receivable, Past Due [Line Items]
State legislative rate change	$ 25,000,000
M5 Louisiana Holdings, LLC
Financing Receivable, Past Due [Line Items]
Settlement proceeds						$ 20,000,000
Past due
Financing Receivable, Past Due [Line Items]
Financing receivables				0
Notes receivable - related party | Internal grade 1
Financing Receivable, Past Due [Line Items]
Financing receivable originated prior to 2021				4,000,000
Notes receivable
Financing Receivable, Past Due [Line Items]
Asset (gains) losses and impairments, net		$ 17,000,000	$ (19,000,000)
Proceeds from sale of notes receivable		$ 22,000,000
Financing receivables on nonaccrual status				$ 0
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

Significant Accounting Polici_5

Significant Accounting Policies (Activity for Financing Receivables Allowance for Expected Credit Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	$ 0	$ 0	$ 8
Additions: Charged to costs, expenses, and other accounts	0	0	0
Deductions: Current period provision and write-offs charged against allowance	0	0	(8)
Ending balance	0	0	0
Notes Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance	0	0	0
Additions: Charged to costs, expenses, and other accounts	0	19	0
Deductions: Current period provision and write-offs charged against allowance	0	(19)	0
Ending balance	$ 0	$ 0	$ 0

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 920	$ 840	$ 754
Lease revenue outside scope of Topic 606	10	9	9
Inter-segment eliminations
Disaggregation of Revenue [Line Items]
Total operating revenues	0	(1)	(1)
Pipeline | Operating segments
Disaggregation of Revenue [Line Items]
Total operating revenues	339	307	266
Gathering | Operating segments
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 581	$ 534	$ 489

Revenue (Contract Liabilities)

Revenue (Contract Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Change In Contract With Customer, Liability [Roll Forward]
Beginning Balance	$ 28	$ 23
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	13	8
Revenue recognized that was included in the balance at the beginning of the period	(9)	(3)
Ending Balance	$ 32	$ 28

Revenue (Expected Recognition o

Revenue (Expected Recognition of Contract Liabilities) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 32
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 4
Remaining performance obligation, expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 102
Remaining performance obligation, expected timing of satisfaction	3 months
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	$ 4
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	$ 88
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	$ 4
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	$ 77
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	$ 4
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	$ 50
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	$ 5
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	$ 33
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	$ 11
Remaining performance obligation, expected timing of satisfaction
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	$ 50
Remaining performance obligation, expected timing of satisfaction

Revenue (Expected Timing of Per

Revenue (Expected Timing of Performance Obligation Satisfaction Related to Fixed Consideration) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 32
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 4
Remaining performance obligation, expected timing of satisfaction	3 months
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	$ 4
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	$ 4
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	$ 4
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	$ 5
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	$ 11
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 400
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 102
Remaining performance obligation, expected timing of satisfaction	3 months
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	$ 88
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 77
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 50
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 33
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 50
Remaining performance obligation, expected timing of satisfaction

Revenue (Narrative) (Details)

Revenue (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Capitalized contract cost, net	$ 19	$ 19
Capitalized contract cost, amortization expense	$ 1	$ 1	$ 1

Revenue (Revenue by Major Custo

Revenue (Revenue by Major Customers) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Operating revenues	$ 920	$ 840	$ 754
Customer A | Revenue | Customer
Revenue, Major Customer [Line Items]
Operating revenues	$ 596	$ 563	$ 227
Percentage of total	65%	67%	31%
Customer B | Revenue | Customer
Revenue, Major Customer [Line Items]
Operating revenues		$ 84	$ 84
Percentage of total		10%	11%
Customer C | Revenue | Customer
Revenue, Major Customer [Line Items]
Operating revenues			$ 278
Percentage of total			37%

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill	$ 473	$ 473	$ 473

Property, Plant, and Equipmen_3

Property, Plant, and Equipment and Intangible Assets (Summary of Property, Plant and Equipment by Classification) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 4,534	$ 4,109
Accumulated depreciation	(728)	(619)
Net Property, plant, and equipment	3,806	3,490
Land and other non-depreciable assets
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	97	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 (in years)	25 years
Rights of way and easements | Maximum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	40 years
Pipelines and interconnects
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 2,845	2,816
Pipelines and interconnects | Minimum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	25 years
Pipelines and interconnects | Maximum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	40 years
Facilities and processing plants
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 998	976
Facilities and processing plants | Minimum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	7 years
Facilities and processing plants | Maximum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	40 years
Wells and well equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 70	71
Wells and well equipment | Minimum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	40 years
Wells and well equipment | Maximum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	70 years
General plant
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 32	23
General plant | Minimum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	3 years
General plant | Maximum
Property, Plant and Equipment [Line Items]
Average estimated useful life (in years)	30 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 389	$ 23

Property, Plant, and Equipmen_4

Property, Plant, and Equipment and Intangible Assets (Details Textuals) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 4,534	$ 4,109
Base natural gas
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$ 50	$ 50

Property, Plant, and Equipmen_5

Property, Plant, and Equipment and Intangible Assets (Summary of Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 2,270	$ 2,270
Accumulated Amortization	(245)	(188)
Net Carrying Value	2,025	2,082
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,252	2,252
Accumulated Amortization	(233)	(177)
Net Carrying Value	2,019	2,075
Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	18	18
Accumulated Amortization	(12)	(11)
Net Carrying Value	$ 6	$ 7
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_6

Property, Plant, and Equipment and Intangible Assets (Estimated Intangibles Amortization Expense) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Abstract]
2023	$ 57
2024	57
2025	57
2026	57
2027	$ 57

Property, Plant, and Equipmen_7

Property, Plant, and Equipment and Intangible Assets (Depreciation and Amortization Expense by Asset Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, plant, and equipment	$ 113	$ 108	$ 97
Customer relationships and other intangible assets, net	57	58	55
Depreciation and amortization	$ 170	$ 166	$ 152

Income Taxes (Effective Income

Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Before Income Taxes	$ 482	$ 422	$ 440
Income tax expense at statutory rate	101	89	92
State and local income taxes, net of federal benefit	24	17	25
State legislative rate change	(25)	(3)	0
Other, net	0	1	(1)
Income Tax Expense	$ 100	$ 104	$ 116
Effective income tax rate	20.70%	24.70%	26.50%

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current income tax expense
Federal	$ 16	$ 1	$ 0
State and other income tax	14	(1)	5
Total current income taxes	30	0	5
Deferred income tax expense
Federal	86	85	84
State and other income tax	(16)	19	27
Total deferred income tax	70	104	111
Income Tax Expense	$ 100	$ 104	$ 116

Income Taxes (Components of Def

Income Taxes (Components of Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax balance components
Property, plant, and equipment	$ (336)	$ (363)
Federal net operating loss carry-forward	129	175
State and local net operating loss carry-forward, net of federal	79	97
Investment in equity method investees and partnerships	(811)	(774)
Other	16	9
Net deferred income tax asset / (liability)	(923)	(856)
Total deferred income tax assets and liabilities
Deferred income tax assets	234	288
Deferred income tax liabilities	(1,157)	(1,144)
Net deferred income tax asset / (liability)	$ (923)	$ (856)

Income Taxes (Details Textuals)

Income Taxes (Details Textuals) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Deferred tax asset related to federal net operating loss carry-forwards	$ 129,000,000	$ 175,000,000
State and local deferred tax assets related to net operating loss carry-forwards	79,000,000	97,000,000
Unrecognized tax benefits	$ 0	$ 0

Earnings Per Share and Divide_3

Earnings Per Share and Dividends (Details Textuals) - $ / shares			1 Months Ended	12 Months Ended
	Jun. 30, 2021	Jan. 13, 2021	Jun. 30, 2021	Dec. 31, 2021		Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
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
Common stock, shares issued (in shares)	96,732,466		96,732,466	96,734,010		96,754,549
Common stock, shares outstanding (in shares)	96,732,466		96,732,466	96,734,010		96,754,549
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common stock, shares issued (in shares)		1,000		1,000	[1]
Issuance of common shares to DTE Energy (in shares)	96,731,466		96,731,466	96,731,000	[2]
Common stock, shares outstanding (in shares)				96,734,000		96,755,000	0	0
[1]Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.[2]Issuance of common shares to DTE Energy in anticipation of the Separation.

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic and Diluted Earnings per Common Share
Net Income Attributable to DT Midstream	$ 370	$ 307	$ 312
Average number of common shares outstanding — basic (in shares)	96.7	96.7	96.7
Incremental shares attributable to:
Average dilutive restricted stock units and performance share awards (in shares)	0.5	0.2	0
Average number of common shares outstanding — diluted (in shares)	97.2	96.9	96.7
Basic earnings per common share (in dollars per share)	$ 3.83	$ 3.17	$ 3.23
Diluted earnings per common share (in dollars per share)	$ 3.81	$ 3.16	$ 3.23

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, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Quarterly Dividend (in dollars per share)	$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 0.60	$ 0.60	$ 2.56	$ 1.20
Dividend Amount	$ 62	$ 62	$ 62	$ 62	$ 58	$ 58	$ 248	$ 116

Fair Value (Details)

Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt principal	$ 3,099	$ 3,095
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - third party	0	5
Short-term notes receivable - related party	0	4
Long-term notes receivable - third party	0	2
Long-term notes receivable - related party	4	0
Long-term debt	3,059	3,046
Carrying Amount | Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	50
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - third party	0	0
Short-term notes receivable - related party	0	0
Long-term notes receivable - third party	0	0
Long-term notes receivable - related party	0	0
Long-term debt	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 notes receivable - third party	0	0
Short-term notes receivable - related party	0	0
Long-term notes receivable - third party	0	0
Long-term notes receivable - related party	0	0
Long-term debt	2,701	3,163
Fair Value | Level 2 | Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	0	50
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - third party	0	5
Short-term notes receivable - related party	0	4
Long-term notes receivable - third party	0	2
Long-term notes receivable - related party	4	0
Long-term debt	0	0
Fair Value | Level 3 | Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 0	$ 0

Debt (Details Textuals)

Debt (Details Textuals)		1 Months Ended	12 Months Ended
	Oct. 19, 2022 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 09, 2021 USD ($)
Line Of Credit Facility [Line Items]
Proceeds from issuance of long-term debt			$ 591,000,000	$ 3,047,000,000	$ 0
Repayment of long-term debt			596,000,000	5,000,000	$ 0
Debt amendment cost			$ 3,000,000
Debt service coverage ratio			6.9
Consolidated net leverage ratio			3.8
Interest coverage ratio			6.3
Senior Notes
Line Of Credit Facility [Line Items]
Dividend capacity remaining				200,000,000
Variable rate Term Loan Facility due 2028
Line Of Credit Facility [Line Items]
Repayment of long-term debt		$ 593,000,000
Prepayment cost		0
Loss on early extinguishment of debt			$ 9,000,000
Write-off of unamortized discount and issuance costs			$ 4,000,000
Minimum debt service coverage ratio			1.1
Secured Revolving Credit Facility expiring June 2026 | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Increase in commitments	$ 250,000,000
Maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000
Fees incurred				$ 7,000,000
Maximum consolidated net leverage ratio			5
Minimum interest coverage ratio			2.5
4.300% Senior Secured Notes due 2032 | Senior Notes
Line Of Credit Facility [Line Items]
Face amount of debt		$ 600,000,000
Interest rate		4.30%	4.30%
Debt issuance costs capitalized		$ 4,000,000
Discount costs capitalized		1,000,000
Proceeds from issuance of long-term debt		$ 593,000,000
4.125% Senior Notes due 2029 | Senior Notes
Line Of Credit Facility [Line Items]
Face amount of debt						$ 1,100,000,000
Interest rate			4.125%
4.375% Senior Notes due 2031 | Senior Notes
Line Of Credit Facility [Line Items]
Face amount of debt						$ 1,000,000,000
Interest rate			4.375%

Debt (Long-term Debt Outstandin

Debt (Long-term Debt Outstanding) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Apr. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt principal	$ 3,099		$ 3,095
Unamortized debt discount	(3)		(4)
Unamortized debt issuance costs	(37)		(45)
Long-term debt due within one year	0		(10)
Long-term debt (net of current portion)	$ 3,059		3,036
4.125% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.125%
Long-term debt principal	$ 1,100		1,100
4.375% Senior Notes due 2031 | Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.375%
Long-term debt principal	$ 1,000		1,000
4.300% Senior Secured Notes due 2032 | Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.30%	4.30%
Long-term debt principal	$ 600		0
Variable rate Term Loan Facility due 2028
Debt Instrument [Line Items]
Long-term debt principal	399		$ 995
Variable rate Term Loan Facility due 2028 | LIBOR
Debt Instrument [Line Items]
Long-term debt principal	$ 399
Basis spread on variable rate	2%
Variable rate Term Loan Facility due 2028 | LIBOR | Minimum
Debt Instrument [Line Items]
Variable rate	0.50%

Debt (Availability Under the Re

Debt (Availability Under the Revolving Credit Facility) (Details) - Revolving Credit Facility, expiring October 2027 - USD ($) $ in Millions	Dec. 31, 2022	Oct. 19, 2022
Line Of Credit Facility [Line Items]
Amounts outstanding	$ 369
Net availability	631
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Total availability	1,000	$ 1,000
Amounts outstanding	330
Letter of credit
Line Of Credit Facility [Line Items]
Amounts outstanding	$ 39

Debt (Debt Maturities) (Details

Debt (Debt Maturities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Long-Term Debt, Maturity, Year One	$ 0
Long-Term Debt, Maturity, Year Two	0
Long-Term Debt, Maturity, Year Three	0
Long-Term Debt, Maturity, Year Four	0
Long-Term Debt, Maturity, After Year Four	3,099
Long-term Debt, Gross	$ 3,099	$ 3,095

Leases (Details Textuals)

Leases (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Lessor, operating lease term	16 years
Fixed lease income	$ 10	$ 9	$ 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 Cos

Leases (Components of Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 20	$ 19	$ 18
Short-term lease cost	0	0	1
Lease cost	$ 20	$ 19	$ 19

Leases (Other Relevant Informat

Leases (Other Relevant Information Related to Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of these liabilities:
Operating cash flows for operating leases	$ 18	$ 19	$ 18
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 14	$ 9	$ 16
Weighted Average Remaining Lease Term
Operating leases	4 years	4 years 4 months 24 days	3 years 2 months 12 days
Weighted Average Discount Rate
Operating leases	3.50%	2.60%	2.80%

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments Under Leases) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 16
2024	9
2025	3
2026	1
2027	1
2028 and thereafter	7
Total future minimum lease payments	37
Imputed interest	(2)
Lease liabilities	$ 35

Leases (Future Minimum Rental R

Leases (Future Minimum Rental Revenues) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Leases [Abstract]
2023	$ 9
2024	9
2025	9
2026	9
2027	9
2028 and thereafter	96
Total	$ 141

Leases (Property Under Operatin

Leases (Property Under Operating Leases) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Gross property under operating leases	$ 58	$ 58
Accumulated amortization of property under operating leases	$ 12	$ 9

Commitments and Contingencies_2

Commitments and Contingencies (Details Textuals) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Accrued contingent liabilities		$ 19,000,000		$ 20,000,000
Allowance for expected credit loss related to accounts receivable		0
Arsenal Resources
Loss Contingencies [Line Items]
Allowance for expected credit loss related to accounts receivable		0		$ 0
Payments received under terms of cure agreement	$ 4,000,000
Revolving Term Credit Facility | Vector Pipeline
Loss Contingencies [Line Items]
Financing receivables			$ 70
Maximum potential payout under line of credit		$ 52,000,000

Commitments and Contingencies_3

Commitments and Contingencies (Purchase Commitments) (Details) $ in Millions	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Obligation, to be Paid, Year One	$ 11
Purchase Obligation, to be Paid, Year Two	13
Purchase Obligation, to be Paid, Year Three	12
Purchase Obligation, to be Paid, Year Four	11
Purchase Obligation, to be Paid, Year Five	10
Purchase Obligation, to be Paid, after Year Five	46
Purchase Obligation, Total	$ 103

Stock-based Compensation and _3

Stock-based Compensation and Defined Contribution Plans (Details Textuals) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jul. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized limit of common stock (in shares)		4,750,000
Maximum annual increase for authorized common stock (in shares)		1,750,000
Unrecognized compensation cost related to non-vested stock incentive plan arrangements		$ 21
Unrecognized compensation cost related to non-vested stock incentive plan arrangements, period for recognition		1 year 10 months 6 days
Defined contribution plan cost		$ 5	$ 3	$ 2
Performance Shares
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)		$ 72.97
Grants (in shares)		240,000	0	0
Settled (in shares)		(79,000)	0	0
Intrinsic value settled stock		$ 4
Performance Shares | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Plan modification, incremental cost	$ 1
Performance Shares | 2019 | DTE Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of award settled	66.67%
Performance Shares | 2020 | DTE Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of award settled	33.33%
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)		$ 52.25
Intrinsic value vested stock		$ 3	$ 0.1
Grants (in shares)		91,000	0	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, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 17	$ 12	$ 6
Tax benefit	$ 4	$ 3	$ 2

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted Average Grant Date Fair Value
Settled (in dollars per share)	$ 34.89
Vested, not issued (in shares)	24,000
Restricted Stock Units
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	466,000
Grants (in shares)	91,000	0	0
Forfeitures (in shares)	(20,000)
Vested (in shares)	(69,000)
Ending balance (in shares)	468,000	466,000
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 41.60
Grants (in dollars per share)	49.73
Forfeitures (in dollars per share)	43.73
Vested and issued (in dollars per share)	40.23
Ending balance (in dollars per share)	$ 43.28	$ 41.60
Intrinsic value vested stock	$ 3	$ 0.1
Performance Shares
Restricted Stock Units/Performance Shares
Beginning balance (in shares)	290,000
Grants (in shares)	240,000	0	0
Forfeitures (in shares)	(42,000)
Settled (in shares)	(79,000)	0	0
Ending balance (in shares)	409,000	290,000
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 40.63
Grants (in dollars per share)	65.64
Forfeitures (in dollars per share)	57.93
Ending balance (in dollars per share)	$ 56.55	$ 40.63

Segment and Related Informati_3

Segment and Related Information (Inter-segment Billing) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Inter-segment billing	$ (920)	$ (840)	$ (754)
Inter-segment eliminations
Segment Reporting Information [Line Items]
Inter-segment billing	$ 0	$ 1	$ 1

Segment and Related Informati_4

Segment and Related Information (Financial Data for Business Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues	$ 920	$ 840	$ 754
Operation and maintenance	267	231	175
Depreciation and amortization	170	166	152
Taxes other than income	28	24	15
Asset (gains) losses and impairments, net	(23)	17	(2)
Operating Income	478	402	414
Interest expense	137	112	113
Interest income	(3)	(4)	(9)
Earnings from equity method investees	(150)	(126)	(108)
Loss from financing activities	13	0	0
Other (income) and expense	(1)	(2)	(22)
Income Tax Expense	100	104	116
Net Income	382	318	324
Less: Net Income Attributable to Noncontrolling Interests	12	11	12
Net Income Attributable to DT Midstream	370	307	312
Capital expenditures and acquisitions	890	140	518
Investments in equity method investees	2,200	1,691	1,691
Goodwill	473	473	473
Total Assets	8,833	8,166	8,342
Pipeline
Segment Reporting Information [Line Items]
Loss from financing activities	6
Gathering
Segment Reporting Information [Line Items]
Loss from financing activities	7
Operating segments | Pipeline
Segment Reporting Information [Line Items]
Operating revenues	339	307	266
Operation and maintenance	54	59	53
Depreciation and amortization	63	63	52
Taxes other than income	14	13	7
Asset (gains) losses and impairments, net	(6)	0	0
Operating Income	214	172	154
Interest expense	57	51	43
Interest income	(1)	(1)	(4)
Earnings from equity method investees	(150)	(126)	(108)
Other (income) and expense	0	(3)	(2)
Income Tax Expense	62	62	58
Net Income	240	189	167
Less: Net Income Attributable to Noncontrolling Interests	12	11	12
Net Income Attributable to DT Midstream	228	178	155
Capital expenditures and acquisitions	638	20	350
Investments in equity method investees	2,200	1,691	1,691
Goodwill	53	53	53
Total Assets	4,625	4,165	4,343
Operating segments | Gathering
Segment Reporting Information [Line Items]
Operating revenues	581	534	489
Operation and maintenance	213	173	123
Depreciation and amortization	107	103	100
Taxes other than income	14	11	8
Asset (gains) losses and impairments, net	(17)	17	(2)
Operating Income	264	230	260
Interest expense	80	61	70
Interest income	(2)	(3)	(5)
Earnings from equity method investees	0	0	0
Other (income) and expense	(1)	1	(20)
Income Tax Expense	38	42	58
Net Income	142	129	157
Less: Net Income Attributable to Noncontrolling Interests	0	0	0
Net Income Attributable to DT Midstream	142	129	157
Capital expenditures and acquisitions	252	120	168
Investments in equity method investees	0	0	0
Goodwill	420	420	420
Total Assets	4,208	4,001	3,999
Inter-segment eliminations
Segment Reporting Information [Line Items]
Operating revenues	0	(1)	(1)
Operation and maintenance	0	(1)	(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 and acquisitions	0	0	0
Investments in equity method investees	0	0	0
Goodwill	0	0	0
Total Assets	$ 0	$ 0	$ 0

Related Party Transactions (Det

Related Party Transactions (Details Textuals) - USD ($) $ in Millions		1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 01, 2021	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Cash payment to settle short-term borrowings due to DTE Energy		$ 2,537
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy		$ 9
Common Stock
Related Party Transaction [Line Items]
Distribution of shares (in shares)	96,732,466
Affiliated entity
Related Party Transaction [Line Items]
Related party interest rate				3.30%	3.90%
Term of related party agreement			1 year

Related Party Transactions (Sum

Related Party Transactions (Summary of Related Party Balances) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Notes receivable from DTE Energy/Vector	$ 0	$ 4
Notes receivable from Vector — long-term	4	0
Current Liabilities — Other	3	3
Equity Method Investee
Related Party Transaction [Line Items]
Notes receivable from DTE Energy/Vector	0	4
Notes receivable from Vector — long-term	$ 4	$ 0

Related Party Transactions (S_2

Related Party Transactions (Summary of Related Party Transactions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Interest income	$ 0	$ (5)	$ (6)
Interest expense	0	43	110
Operation and maintenance and Other expense	(1)	43	54
Notes receivable repaid by DTE Energy	0	263	(146)
Repayment of borrowings from DTE Energy	0	(3,175)	253
Dividend to DTE Energy	0	(501)	0
Contributions from DTE Energy	0	110	252
Non-cash distributions to DTE Energy	0	(10)	(62)
Pipeline
Related Party Transaction [Line Items]
Revenues	0	5	16
Gathering
Related Party Transaction [Line Items]
Revenues	$ 0	$ 10	$ 10

Subsequent Event (Details)

Subsequent Event (Details) - $ / shares		3 Months Ended						12 Months Ended
	Feb. 16, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Subsequent Event [Line Items]
Dividends declared on common stock (in dollars per share)		$ 0.64	$ 0.64	$ 0.64	$ 0.64	$ 0.60	$ 0.60	$ 2.56	$ 1.20
Subsequent Event
Subsequent Event [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.69