DT Midstream (DTM) 10-Q 6 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2021shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	1-40392
Entity Registrant Name	DT Midstream, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-2663964
Entity Address, Address Line One	One Energy Plaza
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	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	96,732,466
Entity Central Index Key	0001842022
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Operating revenues	$ 208	$ 174	$ 405	$ 343
Operating Expenses
Operation and maintenance	57	33	107	66
Depreciation and amortization	41	37	82	73
Taxes other than income	6	4	13	8
Asset (gains) losses and impairments, net	18	0	17	0
Operating Income	86	100	186	196
Other (Income) and Deductions
Interest expense	24	26	50	53
Interest income	(1)	(1)	(4)	(2)
Earnings from equity method investees	(28)	(24)	(60)	(54)
Other (income) and expense	(1)	0	(2)	0
Income Before Income Taxes	92	99	202	199
Income Tax Expense	21	26	50	52
Net Income	71	73	152	147
Less: Net Income Attributable to Noncontrolling Interests	3	2	6	5
Net Income Attributable to DT Midstream	$ 68	$ 71	$ 146	$ 142
Basic Earnings per Common Share (in dollars per share)	$ 0.70	$ 0.73	$ 1.51	$ 1.47
Diluted Earnings per Common Share (in dollars per share)	$ 0.70	$ 0.73	$ 1.51	$ 1.47
Weighted Average Common Shares Outstanding
Basic (in shares)	96,732,466	96,732,466	96,732,466	96,732,466
Diluted (in shares)	96,732,466	96,732,466	96,732,466	96,732,466

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 71	$ 73	$ 152	$ 147
Foreign currency translation and unrealized gain on derivatives, net of tax	0	1	1	0
Other Comprehensive Income	0	1	1	0
Comprehensive Income	71	74	153	147
Less: Comprehensive Income Attributable to Noncontrolling Interests	3	2	6	5
Comprehensive Income Attributable to DT Midstream	$ 68	$ 72	$ 147	$ 142

Consolidated Statements of Fina

Consolidated Statements of Financial Position - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Cash	$ 37	$ 42
Accounts receivable (net of no allowance for doubtful accounts for each period end)
Third party	108	123
Related party	0	3
Notes receivable
Due from DTE Energy/Related party	4	263
Third party	6	11
Deferred property taxes	12	24
Other	13	17
Total Current Assets	180	483
Investments
Investments in equity method investees	1,686	1,691
Property
Property, plant, and equipment	4,035	3,981
Accumulated depreciation	(565)	(511)
Property, Plant and Equipment, Net	3,470	3,470
Other Assets
Goodwill	473	473
Long-term notes receivable
Third party	5	15
Related party	0	4
Operating lease right-of-use assets	36	45
Customer relationships and other intangible assets, net	2,111	2,140
Other	29	21
Total Other Assets	2,654	2,698
Total Assets	7,990	8,342
Accounts payable
Third party	26	29
Related party	0	10
Current portion of long-term debt	10	0
Operating lease liabilities	17	17
Short-term borrowings due to DTE Energy		3,175
Interest payable	6	0
Property taxes payable	21	24
Other	27	33
Total Current Liabilities	107	3,288
Long-term Debt (net of current portion)	3,037	0
Other Liabilities
Deferred income taxes	791	743
Operating lease liabilities	20	28
Other	54	55
Total Other Liabilities	865	826
Total liabilities	4,009	4,114
Commitments and Contingencies (Note 7)
Stockholder's Equity/Member's Equity
Common stock ($0.01 par value, 550,000,000 shares authorized and 96,732,466 shares issued and outstanding at June 30, 2021, and no shares authorized, issued or outstanding at December 31, 2020)	1
Additional paid in capital	3,453
Additional paid in capital		3,333
Retained earnings	386	751
Accumulated other comprehensive income (loss)	(10)	(11)
Total DT Midstream Equity	3,830
Total DT Midstream Equity		4,073
Noncontrolling interests	151
Noncontrolling interests		155
Total Equity	3,981
Total Equity		4,228
Total Liabilities and Equity	$ 7,990	$ 8,342

Consolidated Statements of Fi_2

Consolidated Statements of Financial Position (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Allowance for doubtful accounts	$ 0	$ 0
Shareholder’s Equity
Par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	550,000,000
Common stock, shares issued (in shares)	96,732,466
Common stock, shares outstanding (in shares)	96,732,466

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Operating Activities
Net Income		$ 152	$ 147
Adjustments to reconcile Net Income to Net cash from operating activities:
Depreciation and amortization		82	73
Deferred income taxes		48	50
Earnings from equity method investees		(60)	(54)
Dividends from equity method investees		65	70
Asset (gains) losses and impairments, net		17	0
Changes in assets and liabilities:
Accounts receivable, net		18	14
Accounts payable — Third party		3	(6)
Accounts payable — Related party		(10)	(3)
Other current and noncurrent assets and liabilities		13	6
Net cash from operating activities		328	297
Investing Activities
Plant and equipment expenditures		(60)	(346)
Proceeds from sale of assets		2	0
Distributions from equity method investees		4	2
Contributions to equity method investees		(4)	(16)
Notes receivable due from DTE Energy		263	(134)
Notes receivable — Third party and Related party		(4)	(5)
Net cash from (used for) investing activities		201	(499)
Financing Activities
Issuance of long-term debt, net of discount and issuance costs		3,047	0
Repayment of Short-term borrowings due to DTE Energy		(3,175)	(29)
Payment of Revolving Credit Facility fees		(7)	0
Issuance of common shares to DTE Energy		1	0
Distributions to noncontrolling interests		(9)	(6)
Dividend to DTE Energy		(501)	0
Contributions from DTE Energy		110	262
Net cash from (used for) financing activities		(534)	227
Net Increase (Decrease) in Cash		(5)	25
Cash at Beginning of Period		42	46
Cash and Restricted Cash at End of Period	[1]	37	71
Supplemental disclosure of cash information
Interest, net of interest capitalized		43	50
Income taxes		2	0
Supplemental disclosure of non-cash investing and financing activities
Plant and equipment expenditures in accounts payable and other accruals		$ 15	$ 101
[1]	(a) Includes no Restricted cash at June 30, 2021 and $40 million in Restricted cash at June 30, 2020.

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity/Member's Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid In Capital	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning Balance at Dec. 31, 2019		$ 3,724		$ 3,081		$ 501	$ (13)	$ 155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		74				71		3
Distributions to noncontrolling interests		(3)						(3)
Taxes and other adjustments		(1)		(1)
Other comprehensive income (loss), net of tax		(1)					(1)
Ending Balance at Mar. 31, 2020		3,793		3,080		572	(14)	155
Beginning Balance at Dec. 31, 2019		3,724		3,081		501	(13)	155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		147
Other comprehensive income (loss), net of tax		0
Ending Balance at Jun. 30, 2020		4,127		3,342		644	(13)	154
Beginning Balance at Mar. 31, 2020		3,793		3,080		572	(14)	155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		73				71		2
Distributions to noncontrolling interests		(3)						(3)
Taxes and other adjustments		263		262		1
Other comprehensive income (loss), net of tax		1					1
Ending Balance at Jun. 30, 2020		4,127		3,342		644	(13)	154
Beginning Balance at Dec. 31, 2020		4,228		3,333		751	(11)	155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		81				78		3
Reorganization to C Corporation/ Issuance of common shares to DTE Energy (in shares)	[1]		1,000
Distributions to noncontrolling interests		(6)						(6)
Taxes and other adjustments		0			$ (1)	2		(1)
Other comprehensive income (loss), net of tax		1					1
Ending Balance (in shares) at Mar. 31, 2021			1,000
Ending Balance at Mar. 31, 2021		4,304	$ 0		3,332	831	(10)	151
Beginning Balance at Dec. 31, 2020		4,228		$ 3,333		751	(11)	155
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		152
Reorganization to C Corporation/ Issuance of common shares to DTE Energy (in shares)			96,732,466
Other comprehensive income (loss), net of tax		$ 1
Ending Balance (in shares) at Jun. 30, 2021		96,732,466	96,732,466
Ending Balance at Jun. 30, 2021		$ 3,981	$ 1		3,453	386	(10)	151
Beginning Balance (in shares) at Mar. 31, 2021			1,000
Beginning Balance at Mar. 31, 2021		4,304	$ 0		3,332	831	(10)	151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		71				68		3
Reorganization to C Corporation/ Issuance of common shares to DTE Energy (in shares)	[2]		96,731,466
Issuance of common shares to DTE Energy	[2]	1	$ 1
Distributions to noncontrolling interests		(3)						(3)
Dividend to DTE Energy		(501)				(501)
Taxes and other adjustments		109			121	(12)
Other comprehensive income (loss), net of tax		$ 0
Ending Balance (in shares) at Jun. 30, 2021		96,732,466	96,732,466
Ending Balance at Jun. 30, 2021		$ 3,981	$ 1		$ 3,453	$ 386	$ (10)	$ 151
[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	Jun. 30, 2021	Mar. 31, 2021	Jan. 13, 2021
Statement of Stockholders' Equity [Abstract]
Par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($)	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Restricted cash	$ 0	$ 40,000,000

Separation, Description of the

Separation, Description of the Business, and Basis of Presentation	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Separation, Description of the Business, and Basis of Presentation	SEPARATION, DESCRIPTION OF THE BUSINESS, AND BASIS OF PRESENTATION The Separation On October 27, 2020, DTE Energy announced that its Board of Directors had authorized the separation of the DTE midstream business, formerly known as DTE Gas Enterprises, LLC, and its consolidated subsidiaries ("DT Midstream") from DTE Energy. In connection with the Separation, on January 13, 2021, DTE Gas Enterprises, LLC converted into a Delaware corporation pursuant to a statutory conversion and changed its name to DT Midstream, Inc. 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 June 30, 2020 and a corporation with stockholder’s equity as of June 30, 2021, Consolidated Statements of Changes in Stockholder’s Equity/Member’s Equity are presented as of June 30, 2021 and June 30, 2020. In June 2021, the DT Midstream Board of Directors authorized the issuance of an additional 96,731,466 common shares to DTE Energy in anticipation of the Separation, for a total of 96,732,466 common shares issued and outstanding. In June 2021, in order to facilitate the Separation and settle short-term borrowings due to DTE Energy, DT Midstream issued long-term debt in the form of $2.1 billion senior notes and a $1.0 billion term loan facility. Using the debt proceeds, net of discount and issuance costs of $53 million, 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 of $501 million 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 of record as of 5:00 p.m. ET on June 18, 2021 (the "record date"). DTE Energy shareholders received one share of DT Midstream common stock for every two shares of DTE Energy common stock held at the close of business on the record date, with certain shareholders receiving cash in lieu of fractional shares of DT Midstream common stock. Following the Separation on July 1, 2021, DT Midstream became an independent public company listed under the symbol "DTM" on the NYSE and DTE Energy no longer retains any ownership in DT Midstream. In order to govern the ongoing relationships between DT Midstream and DTE Energy after the Separation and to facilitate an orderly transition, the parties entered into a series of agreements including the following: • Separation and Distribution Agreement – sets forth the principal actions to be taken in connection with the Separation, including the transfer of assets and assumption of liabilities, among others, and sets forth other agreements governing aspects of the relationship between DTE Energy and DT Midstream. • Transition Services Agreement ("TSA") – allows for DTE Energy to provide DT Midstream with specified services for a limited time and no longer than 24 months following the Separation, including support for accounting, tax, legal, human resources, informational technology, and various other administrative and operational services. Prior to the termination of the TSA, DT Midstream will establish standalone functions to provide services currently received from DTE Energy, or will obtain such services from unaffiliated third parties. • Tax Matters Agreement – governs the respective rights, responsibilities and obligations of DTE Energy and DT Midstream after the Separation with respect to all tax matters. • Employee Matters Agreement – addresses certain employment, compensation and benefits matters, including the allocation and treatment of certain assets and liabilities relating to DT Midstream employees. In addition, DT Midstream has various commercial agreements with DTE Energy and its subsidiaries that will continue after the Separation. These agreements include certain pipeline, gathering, and storage services and operating and maintenance agreements. 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 primary segments: (i) Pipeline, which includes interstate pipelines, intrastate pipelines, storage systems, lateral pipelines and related treatment plants and compression and surface facilities, and (ii) Gathering, which includes gathering systems and related treatment plants and compression and surface facilities. DT Midstream also has interests in equity method investees which own and operate interstate pipelines, many of which have connectivity to DT Midstream’s assets. DT Midstream’s core assets connect demand centers in the Midwestern U.S., Eastern Canada, Northeastern U.S. and Gulf Coast regions to production areas of the Marcellus/Utica and Haynesville dry natural gas formations in the Appalachian and Gulf Coast Basins, respectively. Basis of Presentation DT Midstream has historically operated as a consolidated entity of DTE Energy and not as a standalone company. The Consolidated Financial Statements and Notes to Consolidated Financial Statements included herein are prior to the Separation and thus are 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 financial statements may not include all expenses that would have been incurred had DT Midstream existed as a standalone entity. DT Midstream is the parent holding company for the legal entities included in the Separation; therefore, these financial statements are presented on a consolidated basis. 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. In DT Midstream's opinion, the accompanying unaudited Consolidated Financial Statements include all adjustments, consisting of only normal recurring adjustments, necessary to present a fair statement of our financial position as of June 30, 2021, results of operations for the three and six months ended June 30, 2021 and 2020, statement of changes in stockholder's equity/member's equity for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. The balance sheet as of December 31, 2020 was derived from audited annual financial statements, but does not contain all of the footnote disclosures from the annual financial statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the year ending December 31, 2021. The Consolidated Financial Statements should be read in conjunction with the DT Midstream Consolidated Financial Statements and the Notes to Consolidated Financial Statements included in the Registration Statement on Form 10 (File No. 001-40392) as filed with the SEC on May 26, 2021. Cost Allocations The Consolidated Financial Statements of DT Midstream include general corporate expenses of DTE Energy that have historically been allocated monthly to DT Midstream and classified within the appropriate Statement of Operations line item. Corporate allocations include expenses related to labor and benefits, professional fees, shared assets and other expenses related to DTE Energy's corporate functions that provided support to DT Midstream. The allocation methodology utilized for purposes of this carve-out is consistent with the legacy allocation process, which allocates costs based on cost drivers. Cost drivers represent units of work that best reflect the consumption of resources within a specific corporate support function for a business group, and include time studies, activity-based metrics, headcount, and other allocation methods. DT Midstream believes this combination of cost drivers appropriately allocates costs attributable to our business. Effective July 1, 2021, with the completion of the Separation, DT Midstream no longer receives corporate allocations from DTE Energy. DTE Energy support services are provided through the TSA. Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operation and maintenance $ 16 $ 6 $ 32 $ 12 Total corporate allocations $ 16 $ 6 $ 32 $ 12 Corporate allocations for the three and six months ended June 30, 2021 include approximately $9 million and $19 million, respectively, of Separation related transaction costs for legal, accounting, auditing and other professional services DTE Energy incurred for the benefit of DT Midstream. DT Midstream expects to directly incur additional transaction costs in the third quarter in conjunction with the completed Separation. Cash Management Historically, DT Midstream’s sources of liquidity included cash generated from operations and, prior to the Separation, loans obtained through DTE Energy’s corporate-wide cash management program ("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. As a subsidiary of DTE Energy, DT Midstream’s bank accounts were set up as zero balance accounts held by DTE Energy. Cash was swept in and out of the bank’s accounts daily in order to achieve a zero balance at the close of each workday. Net DT Midstream cash inflows or outflows were settled daily against the notes receivable or borrowings, as applicable, with DTE Energy. After the Separation, our sources of liquidity include cash generated from operations and available borrowings under our Revolving Credit Facility. The cash and cash equivalents held by DTE Energy at the corporate level were not attributed to DT Midstream for any of the periods presented. Only cash amounts specifically attributable to DT Midstream are reflected in the accompanying Consolidated Statements of Financial Position. For the periods presented, these amounts included cash held by consolidated entities with noncontrolling interests, which were not managed as part of the cash management program. Notes receivable and borrowings with DTE Energy arising from the working capital loan agreement have been presented as assets and liabilities, respectively, on the Consolidated Statements of Financial Position. DTE Energy receivables and payables are classified as "related party" on the Consolidated Statements of Financial Position, given that their historical method of settlement is cash. The classification of these items as current or noncurrent is dependent on the due date of the asset or obligation. DT Midstream had $3,175 million in Short-term borrowings due to DTE Energy and $263 million in Notes receivable due from DTE Energy at December 31, 2020. In the second quarter 2021, DTE Energy and DT Midstream amended the working capital loan agreements to combine all outstanding notes receivables and borrowings with DTE Energy into a single agreement with a net Short-term borrowing due to DTE Energy. Upon issuance of the senior notes and Term Loan Facility in June 2021, DT Midstream repaid the Short-term borrowing due to DTE Energy, and had $3,047 million in external debt at June 30, 2021. See Note 6, "Debt" for further information regarding the external debt issuances. Prior to June 2021, interest expense recorded in the Consolidated Statements of Operations is primarily related to interest on the Short- term borrowings due to DTE Energy. DT Midstream incurred interest expense on Short-term borrowings due to DTE Energy of $17 million and $29 million for the three months ended June 30, 2021 and 2020, respectively and $43 million and $58 million for the six months ended June 30, 2021 and 2020, respectively. The working capital loan agreement had interest rates of 3.3% and 3.9% for 2021 and 2020, respectively, and a term of one year. Effective July 1, 2021, DT Midstream no longer participates in the cash management program and the working capital loan agreement was terminated. Income Taxes During the periods presented in the Consolidated Financial Statements, the results of DT Midstream’s operations were included in the consolidated federal income tax return and in a number of consolidated state income tax returns filed (and to be filed) by DTE Energy. After DTE Energy files its consolidated income tax returns for 2021, we anticipate there will be a settlement between DT Midstream and DTE Energy under the Tax Matters Agreement related to income taxes for the first half of 2021 prior to the Separation. The income tax provision included in these Consolidated Financial Statements has been computed on a stand-alone basis as if DT Midstream filed separate federal, state, local, and foreign income tax returns for the periods presented, which is referred to as the separate return method. Use of the separate return method may result in differences in the DT Midstream standalone tax provisions and related deferred tax assets and liabilities as compared to the corresponding amounts for DT Midstream as presented in the DTE Energy Consolidated Financial Statements. Consequently, certain income taxes currently payable or receivable are deemed to have been contributed to or distributed from DT Midstream, through Stockholder's Equity/Member's Equity, in the period that the liability or asset arose. DT Midstream’s income taxes, as presented in the carve-out financial statements, may not be indicative of the income taxes that DT Midstream will generate in the future. 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. A VIE refers to entities in which DT Midstream has a controlling influence regardless of the amount of ownership interests. 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. For non-consolidated VIEs, the maximum risk exposure of DT Midstream is generally limited to its investment, notes receivable, future funding commitments, and amounts which it has guaranteed. DT Midstream owns an 85% interest in the SGG VIE, which owns and operates midstream natural gas assets. SGG has contracts in which certain construction risk was designed to pass-through to customers, with DT Midstream retaining operational and customer default risk. DT Midstream is the primary beneficiary of SGG, therefore SGG 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 items in the Consolidated Statements of Financial Position for consolidated VIEs as of June 30, 2021 and December 31, 2020. 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. VIEs, in which DT Midstream holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below. Amounts for consolidated VIEs are as follows: June 30, December 31, 2020 (millions) ASSETS (a) Cash $ 27 $ 34 Accounts receivable — third party 9 8 Other current assets 1 2 Intangible assets, net 520 527 Property, plant and equipment, net 407 411 Goodwill 25 25 $ 989 $ 1,007 LIABILITIES (a) Accounts payable and other current liabilities $ 3 $ 2 Other noncurrent liabilities 4 5 $ 7 $ 7 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities. DT Midstream has a variable interest in NEXUS. NEXUS is a VIE as it has insufficient equity at risk to finance its activities. DT Midstream is not the primary beneficiary, as the power to direct significant activities is shared between the owners of the equity interests. DT Midstream accounts for its ownership interest in NEXUS under the equity method of accounting. DT Midstream has a variable interest in an investment in certain assets in the Utica shale region. DT Midstream does not have an ownership interest in the entity and is not the primary beneficiary. The maximum risk exposure is limited to amounts DT Midstream has funded, which are accounted for as a note receivable, or committed to fund for joint development activities. See Note 2, "Significant Accounting Policies – Financing Receivables " for additional discussion. Amounts for non-consolidated VIEs are as follows: June 30, December 31, 2020 (millions) Investments in equity method investees $ 1,345 $ 1,349 Notes receivable — current 6 11 Notes receivable — noncurrent 5 15 Future funding commitments $ 17 $ 21 Related Parties Transactions between DT Midstream and DTE Energy, as well as transactions between DT Midstream and its equity method investees, have been presented as related party transactions in the accompanying 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. As of June 30, 2021 and December 31, 2020, DT Midstream’s share of the underlying equity in the net assets of the investees exceeded the carrying amounts of Investments in equity method investees by $11 million and $13 million, respectively. The difference will be amortized over the life of the underlying assets. As of June 30, 2021 and December 31, 2020, DT Midstream's consolidated retained earnings balance includes undistributed earnings from equity method investments of $88 million and $94 million, respectively. Equity method investees are described below: Investments As of % Owned As of June 30, December 31, 2020 June 30, December 31, 2020 Equity Method Investee (millions) NEXUS $ 1,345 $ 1,349 50% 50% Vector Pipeline 135 134 40% 40% Millennium Pipeline 206 208 26% 26% Total investments in equity method investees $ 1,686 $ 1,691 For further information by segment, see Note 8, "Segment and Related Information." The following table presents summarized financial information of non-consolidated equity method investees in which DT Midstream owns 50 percent or less. The amounts included below represent 100% of the results of continuing operations of such entities. Summarized income statement data is as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operating revenues $ 179 $ 168 $ 366 $ 352 Operating expenses 95 98 189 193 Net Income $ 75 $ 62 $ 159 $ 142

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES Changes in Accumulated Other Comprehensive Income (Loss) Comprehensive income (loss) is the change in common stockholders' equity/member's equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DT Midstream consist of foreign currency translation adjustments and unrealized losses from derivatives accounted for as cash flow hedges. DT Midstream releases income tax effects from Accumulated other comprehensive income (loss) when the circumstances upon which they are premised cease to exist. Changes in Accumulated other comprehensive income (loss) are presented in DT Midstream's Consolidated Statements of Changes in Stockholder's Equity/Member's Equity (Unaudited). For the three and six months ended months ended June 30, 2021 and 2020, reclassifications out of Accumulated other comprehensive income (loss) were not material. Financing Receivables Financing receivables are primarily composed of trade accounts receivable, notes receivable, and unbilled revenue. DT Midstream's financing receivables are stated at net realizable value. DT Midstream regularly monitors the credit quality of its financing receivables by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, credit agency ratings where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, DT Midstream has determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have rated the counterparty as investment grade. If credit ratings are not available, DT Midstream utilizes other credit quality indicators to determine the risk level associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have rated the counterparty as below investment grade if, due to favorable information on other credit quality indicators, DT Midstream has determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status. The following represents DT Midstream's third party and related party notes receivable by year of origination, classified by internal grade of credit quality. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021. Year of Origination 2021 2020 2019 and prior Total (millions) Notes receivable Internal grade 1 (a) $ — $ — $ 4 $ 4 Internal grade 2 — — — — Internal grade 3 — — 11 11 Total Notes receivable — Third party and Related party $ — $ — $ 15 $ 15 __________________________________ (a) Related party 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 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 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 from the counterparty, including existing and future economic conditions. Cash payments received 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. Accrual of interest is generally resumed when the note receivable becomes contractually current. DT Midstream has an investment in certain assets in the Utica shale region which are accounted for as a Note receivable — Third party. In the second quarter of 2021, we assessed the note receivable for expected loss due to lower than expected actual volumes and proceeds received, and reduced forecasted volumes based on data made available in the second quarter 2021. As a result of the discounted cash flow analysis, we 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 and reclassified the note to an Internal grade 3 receivable. It is possible that significant decreases in forecasted production volumes or commodity prices could result in additional losses on the Note receivable – Third party. There are no other notes receivable on nonaccrual status as of June 30, 2021. There are no past due financing receivables for DT Midstream as of June 30, 2021. For trade accounts receivable, the customer allowance for doubtful accounts is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based on the specific circumstances of the associated receivable. Uncollectible expense was zero for the three and six months ended June 30, 2021, and $2 million for the three and six months ended 2020. DT Midstream has been monitoring the impacts from the COVID-19 pandemic on our customers and various counterparties. As of June 30, 2021, the impact on collectability of DT Midstream’s receivables has not been material. Operations and maintenance Operations and maintenance is primarily comprised of costs for labor, outside services, materials, compression, purchased natural gas and other operating and maintenance costs. Corporate allocations from DTE Energy, including of Separation related transaction costs for legal, accounting, auditing and other professional services DTE Energy incurred for the benefit of DT Midstream, are also included in Operations and maintenance. 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. Income taxes In accordance with GAAP, DT Midstream records income taxes during the interim period using an estimated annual effective tax rate ("ETR") and recognizes specific events discretely as they occur. The interim effective tax rates of DT Midstream are 23% and 26% for the three months ended June 30, 2021 and 2020, respectively, and 25% and 26% for the six months ended June 30, 2021 and 2020, respectively. The difference between the interim effective tax rate and federal statutory rate of 21% is primarily related to state income taxes included in the ETR. The 3% and 1% decreases in DT Midstream's effective tax rate for the three and six months ended June 30, 2021, respectively, were primarily due to West Virginia tax law changes and non-deductible transaction costs incurred during 2021. Earnings per share The DT Midstream Board of Directors authorized the issuance of an additional 96,731,466 common shares to DTE Energy on June 30, 2021 in anticipation of the Separation, for a total of 96,732,466 common shares issued and outstanding. This share amount is utilized for the calculation of basic and diluted earnings per share for all periods presented based on net income attributable to DT Midstream. For the three and six months ended June 30, 2021 and 2020, these shares are treated as issued and outstanding for purposes of calculating historical earnings per share. There were no potentially dilutive instruments outstanding for the three and six months ended June 30, 2021 and June 30, 2020.

New Accounting Pronouncements

New Accounting Pronouncements	6 Months Ended
	Jun. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements	NEW ACCOUNTING PRONOUNCEMENTS Recently Adopted Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes . The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. DT Midstream adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Consolidated Financial Statements. In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity . The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. DT Midstream adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Consolidated Financial Statements. Recently Issued 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. The amendments in this update 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. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. DT Midstream presently has various contracts that reference LIBOR and is assessing how this standard may be applied to specific contract modifications. In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue	REVENUE Significant Accounting Policy Revenue is measured based upon the consideration specified in a contract with a customer at the time when performance obligations are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service or a series of distinct goods or services to the customer. DT Midstream's revenues generally consist of services related to the gathering, transportation, and storage of natural gas. Revenue is recognized when performance obligations are satisfied by transferring control over a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the product or 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. Disaggregation of Revenue The following is a summary of revenues disaggregated by segment: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Pipeline (a) $ 75 $ 57 $ 150 $ 113 Gathering 133 117 255 230 Total operating revenues $ 208 $ 174 $ 405 $ 343 ______________________________________ (a) Includes revenues outside the scope of Topic 606 primarily related to contracts accounted for as leases of $2 million for both the three months ended June 30, 2021 and 2020, and $4 million for both the six months ended June 30, 2021 and 2020. Deferred Revenue The following is a summary of deferred revenue activity: (millions) Balance at January 1, 2021 $ 22 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 2 Revenue recognized that was included in the deferred revenue balance at the beginning of the period (2) Balance at June 30, 2021 $ 22 The deferred revenues at DT Midstream generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied. Performance obligations associated with deferred revenues include providing services related to customer prepayments. Deferred revenues associated with these services are recognized when control has transferred to the customer. The following table represents deferred revenue amounts as of June 30, 2021 that are expected to be recognized as revenue in future periods: (millions) Remainder of 2021 $ 2 2022 3 2023 3 2024 3 2025 3 2026 and thereafter 8 Total $ 22 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 goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation. Such contracts consist of various types of performance obligations, including the delivery of 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 consideration under the contract is variable at the contract inception. Contract lengths vary from cancellable to multi-year. The following table represents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of June 30, 2021 that are expected to be recognized as revenue in future periods: (millions) Remainder of 2021 $ 43 2022 85 2023 77 2024 68 2025 63 2026 and thereafter 126 Total $ 462

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2021
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 asset or liability 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: June 30, 2021 December 31, 2020 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Short-term notes receivable Due from DTE Energy $ — $ — $ — $ — $ 263 $ — $ — $ 292 Third party 6 — — 6 11 — — 11 Related party 4 — — 4 — — — — Long-term notes receivable Third party 5 — — 5 15 — — 15 Related party — — — — 4 — — 4 Short-term borrowings due to DTE Energy — — — — 3,175 — — 3,517 Long-term debt (a) $ 3,047 $ — $ 3,134 $ — $ — $ — $ — $ — _______________________________________ (a) Includes debt due within one year. Carrying value represents principal of $3.1 billion, net of unamortized debt discounts and issuance costs. The fair values of DT Midstream’s non-publicly traded notes receivables due from DTE Energy and short-term borrowings due to DTE Energy were based on an internally developed model and are classified as Level 3 within the fair value hierarchy.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	DEBT Debt Issuances On June 9, 2021, DT Midstream issued 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"). On June 10, 2021, DT Midstream entered into a Credit Agreement ("Credit Agreement") that provides for a $1.0 billion 7-year term loan facility (the "Term Loan Facility") and a $750 million 5-year revolving credit facility (the "Revolving Credit Facility"). Long-Term Debt DT Midstream's long-term debt outstanding included: June 30, Title Type Interest Rate Maturity Date 2021 (millions) 2029 Notes Senior Notes (a) (c) 4.125% 2029 $ 1,100 2031 Notes Senior Notes (a) (c) 4.375% 2031 1,000 Term Loan Facility Term Loan Facility (a) Variable (b) 2028 1,000 3,100 Unamortized debt discount (5) Unamortized debt issuance costs (48) Long-term debt due within one year (10) Total Long-term debt $ 3,037 ______________________________ (a) Debt proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the Separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. See Note 1, "Separation, Description of the Business, and Basis of Presentation" to the Consolidated Financial Statements for additional information. (b) Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The Term Loan Facility includes $900 million with a six-month LIBOR interest period and $100 million with a three month LIBOR interest period. (c) Interest payable semi-annually in arrears each June 15 and December 15, commencing December 15, 2021. The following table shows the scheduled debt maturities, excluding any unamortized discount on debt: Remainder of 2021 2022 2023 2024 2025 2026 and Thereafter Total (millions) Debt maturities $ 5 10 10 10 10 3,055 $ 3,100 Short-Term Credit Arrangements and Borrowings The Revolving Credit Facility was fully available on July 1, 2021 and expires in June 2026. As of June 30, 2021, the availability under the Revolving Credit Facility was limited to $33 million including an $8 million letter of credit issuance in June 2021 and additional credit up to $25 million, of which no amounts were drawn. On July 1, 2021, DT Midstream borrowed $25 million under the Revolving Credit Facility which was repaid on August 2, 2021. Borrowings under the Revolving Credit Facility are for general corporate purposes and letter of credit issuances to support DT Midstream's future operations and liquidity. The Revolving Credit Facility incurred fees of $7 million that are included in Other noncurrent assets on DT Midstream's Consolidated Statements of Financial Position as of June 30, 2021. These fees will be amortized over the term of the Revolving Credit Facility. The Credit Agreement covering the Term Loan Facility and Revolving Credit Facility includes financial covenants that will be effective for DT Midstream beginning in the third quarter 2021. The Term Loan Facility will require the maintenance of a minimum debt service coverage ratio of 1.1 to 1, and the Revolving Credit Facility will require maintenance of (i) maximum consolidated net leverage ratio of 5 to 1, and (ii) a minimum interest coverage ratio of no less than 2.5 to 1.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
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. Finally, DT Midstream may provide indirect guarantees for the indebtedness of others. In connection with the Separation, DT Midstream assumed guarantees of $10 million from DTE Energy. Payments under these guarantees are considered remote. DT Midstream did not have any guarantees of other parties' obligations as of December 31, 2020. Vector Line of Credit In July 2021 and in conjunction with the Separation, DT Midstream assumed the Vector line of credit from DTE Energy. DT Midstream became the lender under the revolving term credit facility to Vector, the borrower, in the amount of Canadian $70 million. The credit facility was initially executed in response to the passage of Canadian regulations requiring oil and gas pipelines to demonstrate their financial ability to respond to a catastrophic event and exists for the sole purpose of satisfying these regulations. Vector may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payout at July 1, 2021 is USD $56 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 shale region. Slope restoration expenditures are typically capital in nature. As of June 30, 2021 and December 31, 2020, DT Midstream had accrued contingent liabilities of $21 million and $23 million, respectively, for future slope restoration expenditures. DT Midstream believes the accrued amounts are sufficient to cover estimated future expenditures. COVID-19 Pandemic DT Midstream is actively monitoring the impact of the COVID-19 pandemic on supply chains, markets, counterparties, and customers, and any related impacts on operating costs, customer demand, and recoverability of assets that could materially impact DT Midstream’s financial results. There have been no material adjustments or reserves deemed necessary to the financial statements as of June 30, 2021 as a result of COVID-19. DT Midstream cannot predict the future impacts of the COVID-19 pandemic on the Consolidated Financial Statements, as developments involving COVID-19 and its related effects on economic and operating conditions remain highly uncertain.

Segment and Related Information

Segment and Related Information	6 Months Ended
	Jun. 30, 2021
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: Pipeline segment, formerly titled Pipeline and Other, 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 segment is engaged in the transportation and storage of natural gas for intermediate and end user customers. The definition and composition of the segment was not impacted by the segment title change and remains consistent with prior periods. 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 processing, to gathering pipelines for further gathering, or to pipelines for transportation, as well as associated ancillary services, including water impoundment, water storage, water transportation 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 three and six months ended June 30, 2021 and 2020. The following table presents financial data by business segment: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operating Revenues: Pipeline $ 75 $ 57 $ 150 $ 113 Gathering 133 117 255 230 Total $ 208 $ 174 $ 405 $ 343 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Net Income Attributable to DT Midstream by Segment: Pipeline $ 44 $ 37 $ 86 $ 72 Gathering 24 34 60 70 Total $ 68 $ 71 $ 146 $ 142

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Event	SUBSEQUENT EVENTOn August 5, 2021, DT Midstream's Board of Directors declared a quarterly dividend to shareholders of $0.60 per share payable on October 15, 2021.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation DT Midstream has historically operated as a consolidated entity of DTE Energy and not as a standalone company. The Consolidated Financial Statements and Notes to Consolidated Financial Statements included herein are prior to the Separation and thus are 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 financial statements may not include all expenses that would have been incurred had DT Midstream existed as a standalone entity. DT Midstream is the parent holding company for the legal entities included in the Separation; therefore, these financial statements are presented on a consolidated basis. 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. In DT Midstream's opinion, the accompanying unaudited Consolidated Financial Statements include all adjustments, consisting of only normal recurring adjustments, necessary to present a fair statement of our financial position as of June 30, 2021, results of operations for the three and six months ended June 30, 2021 and 2020, statement of changes in stockholder's equity/member's equity for the three and six months ended June 30, 2021 and 2020 and cash flows for the six months ended June 30, 2021 and 2020. The balance sheet as of December 31, 2020 was derived from audited annual financial statements, but does not contain all of the footnote disclosures from the annual financial statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the year ending December 31, 2021. The Consolidated Financial Statements should be read in conjunction with the DT Midstream Consolidated Financial Statements and the Notes to Consolidated Financial Statements included in the Registration Statement on Form 10 (File No. 001-40392) as filed with the SEC on May 26, 2021.
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. A VIE refers to entities in which DT Midstream has a controlling influence regardless of the amount of ownership interests. 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. For non-consolidated VIEs, the maximum risk exposure of DT Midstream is generally limited to its investment, notes receivable, future funding commitments, and amounts which it has guaranteed. DT Midstream owns an 85% interest in the SGG VIE, which owns and operates midstream natural gas assets. SGG has contracts in which certain construction risk was designed to pass-through to customers, with DT Midstream retaining operational and customer default risk. DT Midstream is the primary beneficiary of SGG, therefore SGG is consolidated. DT Midstream owns a 50% interest in the South Romeo VIE and is the primary beneficiary, therefore South Romeo is consolidated.
Changes in Accumulated Other Comprehensive Income (Loss)	Changes in Accumulated Other Comprehensive Income (Loss) Comprehensive income (loss) is the change in common stockholders' equity/member's equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DT Midstream consist of foreign currency translation adjustments and unrealized losses from derivatives accounted for as cash flow hedges. DT Midstream releases income tax effects from Accumulated other comprehensive income (loss) when the circumstances upon which they are premised cease to exist.
Financing Receivables	Financing Receivables Financing receivables are primarily composed of trade accounts receivable, notes receivable, and unbilled revenue. DT Midstream's financing receivables are stated at net realizable value. DT Midstream regularly monitors the credit quality of its financing receivables by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, credit agency ratings where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, DT Midstream has determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have rated the counterparty as investment grade. If credit ratings are not available, DT Midstream utilizes other credit quality indicators to determine the risk level associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have rated the counterparty as below investment grade if, due to favorable information on other credit quality indicators, DT Midstream has determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status. The following represents DT Midstream's third party and related party notes receivable by year of origination, classified by internal grade of credit quality. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021. Year of Origination 2021 2020 2019 and prior Total (millions) Notes receivable Internal grade 1 (a) $ — $ — $ 4 $ 4 Internal grade 2 — — — — Internal grade 3 — — 11 11 Total Notes receivable — Third party and Related party $ — $ — $ 15 $ 15 __________________________________ (a) Related party 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 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 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 from the counterparty, including existing and future economic conditions. Cash payments received 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. Accrual of interest is generally resumed when the note receivable becomes contractually current. DT Midstream has an investment in certain assets in the Utica shale region which are accounted for as a Note receivable — Third party. In the second quarter of 2021, we assessed the note receivable for expected loss due to lower than expected actual volumes and proceeds received, and reduced forecasted volumes based on data made available in the second quarter 2021. As a result of the discounted cash flow analysis, we 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 and reclassified the note to an Internal grade 3 receivable. It is possible that significant decreases in forecasted production volumes or commodity prices could result in additional losses on the Note receivable – Third party. There are no other notes receivable on nonaccrual status as of June 30, 2021. There are no past due financing receivables for DT Midstream as of June 30, 2021. For trade accounts receivable, the customer allowance for doubtful accounts is calculated based on specific review of future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based on the specific circumstances of the associated receivable. Uncollectible expense was zero for the three and six months ended June 30, 2021, and $2 million for the three and six months ended 2020. DT Midstream has been monitoring the impacts from the COVID-19 pandemic on our customers and various counterparties. As of June 30, 2021, the impact on collectability of DT Midstream’s receivables has not been material.
Operations and Maintenance	Operations and maintenance Operations and maintenance is primarily comprised of costs for labor, outside services, materials, compression, purchased natural gas and other operating and maintenance costs. Corporate allocations from DTE Energy, including of Separation related transaction costs for legal, accounting, auditing and other professional services DTE Energy incurred for the benefit of DT Midstream, are also included in Operations and maintenance.
Depreciation and Amortization	Depreciation and amortization Depreciation and amortization is related to Property, plant and equipment and Customer relationships and other intangible assets, net, used in our transportation, storage and gathering businesses.
Income Taxes	Income Taxes During the periods presented in the Consolidated Financial Statements, the results of DT Midstream’s operations were included in the consolidated federal income tax return and in a number of consolidated state income tax returns filed (and to be filed) by DTE Energy. After DTE Energy files its consolidated income tax returns for 2021, we anticipate there will be a settlement between DT Midstream and DTE Energy under the Tax Matters Agreement related to income taxes for the first half of 2021 prior to the Separation. The income tax provision included in these Consolidated Financial Statements has been computed on a stand-alone basis as if DT Midstream filed separate federal, state, local, and foreign income tax returns for the periods presented, which is referred to as the separate return method. Use of the separate return method may result in differences in the DT Midstream standalone tax provisions and related deferred tax assets and liabilities as compared to the corresponding amounts for DT Midstream as presented in the DTE Energy Consolidated Financial Statements. Consequently, certain income taxes currently payable or receivable are deemed to have been contributed to or distributed from DT Midstream, through Stockholder's Equity/Member's Equity, in the period that the liability or asset arose. DT Midstream’s income taxes, as presented in the carve-out financial statements, may not be indicative of the income taxes that DT Midstream will generate in the future. Income taxes In accordance with GAAP, DT Midstream records income taxes during the interim period using an estimated annual effective tax rate ("ETR") and recognizes specific events discretely as they occur.
Recently Adopted and Recently Issued Pronouncements	Recently Adopted Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes . The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. DT Midstream adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Consolidated Financial Statements. In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity . The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. DT Midstream adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Consolidated Financial Statements. Recently Issued 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. The amendments in this update 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. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. DT Midstream presently has various contracts that reference LIBOR and is assessing how this standard may be applied to specific contract modifications. In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments
Revenue	Revenue is measured based upon the consideration specified in a contract with a customer at the time when performance obligations are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service or a series of distinct goods or services to the customer. DT Midstream's revenues generally consist of services related to the gathering, transportation, and storage of natural gas. Revenue is recognized when performance obligations are satisfied by transferring control over a service to a customer, which occurs when the service is provided to the customer. When a customer simultaneously receives and consumes the product or 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.

Separation, Description of th_2

Separation, Description of the Business, and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Corporate Allocations	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operation and maintenance $ 16 $ 6 $ 32 $ 12 Total corporate allocations $ 16 $ 6 $ 32 $ 12
Schedule of Variable Interest Entities	The following table summarizes the major items in the Consolidated Statements of Financial Position for consolidated VIEs as of June 30, 2021 and December 31, 2020. 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. VIEs, in which DT Midstream holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below. Amounts for consolidated VIEs are as follows: June 30, December 31, 2020 (millions) ASSETS (a) Cash $ 27 $ 34 Accounts receivable — third party 9 8 Other current assets 1 2 Intangible assets, net 520 527 Property, plant and equipment, net 407 411 Goodwill 25 25 $ 989 $ 1,007 LIABILITIES (a) Accounts payable and other current liabilities $ 3 $ 2 Other noncurrent liabilities 4 5 $ 7 $ 7 _____________________________________ (a) Amounts shown are 100% of the consolidated VIEs' assets and liabilities. Amounts for non-consolidated VIEs are as follows: June 30, December 31, 2020 (millions) Investments in equity method investees $ 1,345 $ 1,349 Notes receivable — current 6 11 Notes receivable — noncurrent 5 15 Future funding commitments $ 17 $ 21
Schedule of Equity Method Investments	Equity method investees are described below: Investments As of % Owned As of June 30, December 31, 2020 June 30, December 31, 2020 Equity Method Investee (millions) NEXUS $ 1,345 $ 1,349 50% 50% Vector Pipeline 135 134 40% 40% Millennium Pipeline 206 208 26% 26% Total investments in equity method investees $ 1,686 $ 1,691 The following table presents summarized financial information of non-consolidated equity method investees in which DT Midstream owns 50 percent or less. The amounts included below represent 100% of the results of continuing operations of such entities. Summarized income statement data is as follows: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operating revenues $ 179 $ 168 $ 366 $ 352 Operating expenses 95 98 189 193 Net Income $ 75 $ 62 $ 159 $ 142

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Schedule of Financing Receivables Classified by Internal Grade of Credit Risk	The following represents DT Midstream's third party and related party notes receivable by year of origination, classified by internal grade of credit quality. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021. Year of Origination 2021 2020 2019 and prior Total (millions) Notes receivable Internal grade 1 (a) $ — $ — $ 4 $ 4 Internal grade 2 — — — — Internal grade 3 — — 11 11 Total Notes receivable — Third party and Related party $ — $ — $ 15 $ 15 __________________________________ (a) Related party

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following is a summary of revenues disaggregated by segment: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Pipeline (a) $ 75 $ 57 $ 150 $ 113 Gathering 133 117 255 230 Total operating revenues $ 208 $ 174 $ 405 $ 343 ______________________________________ (a) Includes revenues outside the scope of Topic 606 primarily related to contracts accounted for as leases of $2 million for both the three months ended June 30, 2021 and 2020, and $4 million for both the six months ended June 30, 2021 and 2020.
Summary of Deferred Revenue Activity	The following is a summary of deferred revenue activity: (millions) Balance at January 1, 2021 $ 22 Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 2 Revenue recognized that was included in the deferred revenue balance at the beginning of the period (2) Balance at June 30, 2021 $ 22
Revenue Expected to be Recognized in Future Periods	The following table represents deferred revenue amounts as of June 30, 2021 that are expected to be recognized as revenue in future periods: (millions) Remainder of 2021 $ 2 2022 3 2023 3 2024 3 2025 3 2026 and thereafter 8 Total $ 22 The following table represents revenue amounts related to fixed consideration associated with unsatisfied performance obligations as of June 30, 2021 that are expected to be recognized as revenue in future periods: (millions) Remainder of 2021 $ 43 2022 85 2023 77 2024 68 2025 63 2026 and thereafter 126 Total $ 462

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2021
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: June 30, 2021 December 31, 2020 Carrying Fair Value Carrying Fair Value Amount Level 1 Level 2 Level 3 Amount Level 1 Level 2 Level 3 (millions) Short-term notes receivable Due from DTE Energy $ — $ — $ — $ — $ 263 $ — $ — $ 292 Third party 6 — — 6 11 — — 11 Related party 4 — — 4 — — — — Long-term notes receivable Third party 5 — — 5 15 — — 15 Related party — — — — 4 — — 4 Short-term borrowings due to DTE Energy — — — — 3,175 — — 3,517 Long-term debt (a) $ 3,047 $ — $ 3,134 $ — $ — $ — $ — $ — _______________________________________ (a) Includes debt due within one year. Carrying value represents principal of $3.1 billion, net of unamortized debt discounts and issuance costs.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt Outstanding	DT Midstream's long-term debt outstanding included: June 30, Title Type Interest Rate Maturity Date 2021 (millions) 2029 Notes Senior Notes (a) (c) 4.125% 2029 $ 1,100 2031 Notes Senior Notes (a) (c) 4.375% 2031 1,000 Term Loan Facility Term Loan Facility (a) Variable (b) 2028 1,000 3,100 Unamortized debt discount (5) Unamortized debt issuance costs (48) Long-term debt due within one year (10) Total Long-term debt $ 3,037 ______________________________ (a) Debt proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the Separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. See Note 1, "Separation, Description of the Business, and Basis of Presentation" to the Consolidated Financial Statements for additional information. (b) Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The Term Loan Facility includes $900 million with a six-month LIBOR interest period and $100 million with a three month LIBOR interest period. (c) Interest payable semi-annually in arrears each June 15 and December 15, commencing December 15, 2021.
Schedule of Debt Maturities	The following table shows the scheduled debt maturities, excluding any unamortized discount on debt: Remainder of 2021 2022 2023 2024 2025 2026 and Thereafter Total (millions) Debt maturities $ 5 10 10 10 10 3,055 $ 3,100

Segment and Related Informati_2

Segment and Related Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Financial Data of Business Segments	The following table presents financial data by business segment: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Operating Revenues: Pipeline $ 75 $ 57 $ 150 $ 113 Gathering 133 117 255 230 Total $ 208 $ 174 $ 405 $ 343 Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 (millions) Net Income Attributable to DT Midstream by Segment: Pipeline $ 44 $ 37 $ 86 $ 72 Gathering 24 34 60 70 Total $ 68 $ 71 $ 146 $ 142

Separation, Description of th_3

Separation, Description of the Business, and Basis of Presentation (Details Textuals)	Jul. 01, 2021	Jun. 30, 2021USD ($)$ / sharesshares	Jan. 13, 2021$ / sharesshares	Jun. 30, 2021USD ($)$ / sharesshares	Jun. 30, 2021USD ($)$ / sharesshares		Mar. 31, 2021$ / sharesshares		Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)segment$ / sharesshares	Jun. 30, 2020USD ($)	Jun. 10, 2021USD ($)	Dec. 31, 2020USD ($)
Related Party Transaction [Line Items]
Par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01	$ 0.01		$ 0.01			$ 0.01
Common stock, shares issued (in shares) | shares		96,732,466		96,732,466	96,732,466					96,732,466
Common stock, shares outstanding (in shares) | shares		96,732,466		96,732,466	96,732,466					96,732,466
Discount and debt issuance costs		$ 53,000,000		$ 53,000,000	$ 53,000,000					$ 53,000,000
Cash payment to settle short-term borrowings due to DTE Energy										3,175,000,000	$ 29,000,000
Dividend to DTE Energy										$ 501,000,000	0
Share issuance ratio										0.5
Number of segments | segment										2
Short-term borrowings due to DTE Energy													$ 3,175,000,000
Notes receivable due from DTE Energy		4,000,000		4,000,000	4,000,000					$ 4,000,000			263,000,000
External debt		3,047,000,000		3,047,000,000	3,047,000,000					3,047,000,000
Amount by which the share of the underlying equity in the net assets exceeds the carrying amount		11,000,000		11,000,000	11,000,000					11,000,000			13,000,000
Undistributed earnings from equity method investments		88,000,000		88,000,000	88,000,000					$ 88,000,000			$ 94,000,000
Variable Interest Entity, Primary Beneficiary, SGG
Related Party Transaction [Line Items]
VIE ownership percentage										85.00%
Variable Interest Entity, Primary Beneficiary, South Romeo
Related Party Transaction [Line Items]
VIE ownership percentage										50.00%
DTE Energy | Maximum | Discontinued operations, spinoff | DT Midstream | Subsequent Event
Related Party Transaction [Line Items]
Transition Services Agreement period	24 years
Affiliated entity
Related Party Transaction [Line Items]
Cash payment to settle short-term borrowings due to DTE Energy				2,537,000,000
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy				9,000,000
Dividend to DTE Energy				501,000,000
Separation related transaction costs					9,000,000					$ 19,000,000
Interest expense on Short-term borrowings due to DTE Energy					17,000,000				$ 29,000,000	$ 43,000,000	$ 58,000,000
Related party interest rate										3.30%	3.90%
Term of related party agreement										1 year
Variable rate Term Loan Facility due 2028
Related Party Transaction [Line Items]
Long-term debt issued		1,000,000,000		1,000,000,000	1,000,000,000					$ 1,000,000,000		$ 1,000,000,000
Senior Notes
Related Party Transaction [Line Items]
Long-term debt issued		$ 2,100,000,000		$ 2,100,000,000	$ 2,100,000,000					$ 2,100,000,000
Common Stock
Related Party Transaction [Line Items]
Shares issued (in shares) | shares		96,731,466	1,000	96,731,466	96,731,466	[1]	1,000	[2]		96,732,466
Common stock, shares outstanding (in shares) | shares		96,732,466		96,732,466	96,732,466		1,000			96,732,466
[1]	Issuance of common shares to DTE Energy in anticipation of the Separation.
[2]	Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.

Separation, Description of th_4

Separation, Description of the Business, and Basis of Presentation (Cost Allocations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Operation and maintenance	$ 57	$ 33	$ 107	$ 66
Affiliated entity
Related Party Transaction [Line Items]
Operation and maintenance	16	6	32	12
Total corporate allocations	$ 16	$ 6	$ 32	$ 12

Separation, Description of th_5

Separation, Description of the Business, and Basis of Presentation (Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash	$ 37	$ 42
Accounts receivable — third party	108	123
Other current assets	13	17
Intangible assets, net	2,111	2,140
Property, plant and equipment, net	3,470	3,470
Goodwill	473	473
Total Assets	7,990	8,342
LIABILITIES
Other noncurrent liabilities	865	826
Total liabilities	4,009	4,114
Variable interest entity, primary beneficiary
ASSETS
Cash	27	34
Accounts receivable — third party	9	8
Other current assets	1	2
Intangible assets, net	520	527
Property, plant and equipment, net	407	411
Goodwill	25	25
Total Assets	989	1,007
LIABILITIES
Accounts payable and other current liabilities	3	2
Other noncurrent liabilities	4	5
Total liabilities	$ 7	$ 7

Separation, Description of th_6

Separation, Description of the Business, and Basis of Presentation (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Investments in equity method investees	$ 1,686	$ 1,691
Notes receivable — current	6	11
Notes receivable — noncurrent	5	15
Variable interest entity, non-consolidated
Variable Interest Entity [Line Items]
Investments in equity method investees	1,345	1,349
Notes receivable — current	6	11
Notes receivable — noncurrent	5	15
Future funding commitments	$ 17	$ 21

Separation, Description of th_7

Separation, Description of the Business, and Basis of Presentation (Equity Method Investees) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments	$ 1,686	$ 1,691
NEXUS
Schedule of Equity Method Investments [Line Items]
Investments	$ 1,345	$ 1,349
% Owned	50.00%	50.00%
Vector Pipeline
Schedule of Equity Method Investments [Line Items]
Investments	$ 135	$ 134
% Owned	40.00%	40.00%
Millennium Pipeline
Schedule of Equity Method Investments [Line Items]
Investments	$ 206	$ 208
% Owned	26.00%	26.00%

Separation, Description of th_8

Separation, Description of the Business, and Basis of Presentation (Financial Information of Non-Consolidated Subsidiaries) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 208		$ 174		$ 405	$ 343
Net Income	71	$ 81	73	$ 74	152	147
Equity method investment, non-consolidated investees
Schedule of Equity Method Investments [Line Items]
Operating revenues	179		168		366	352
Operating expenses	95		98		189	193
Net Income	$ 75		$ 62		$ 159	$ 142

Significant Accounting Polici_4

Significant Accounting Policies (Details Textuals) - USD ($)	Jun. 30, 2021	Jan. 13, 2021	Jun. 30, 2021	Jun. 30, 2021		Mar. 31, 2021		Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Past Due [Line Items]
Loss on note receivable				$ 18,000,000				$ 0	$ 17,000,000	$ 0
Specific review of probable future collections based on receivable balances, threshold duration									30 days
Uncollectible expense				$ 0				$ 2,000,000	$ 0	$ 2,000,000
Effective tax rate				23.00%				26.00%	25.00%	26.00%
Decrease in the effective tax rate				3.00%					1.00%
Common stock, shares issued (in shares)	96,732,466		96,732,466	96,732,466					96,732,466
Common stock, shares outstanding (in shares)	96,732,466		96,732,466	96,732,466					96,732,466
Common Stock
Financing Receivable, Past Due [Line Items]
Shares issued (in shares)	96,731,466	1,000	96,731,466	96,731,466	[1]	1,000	[2]		96,732,466
Common stock, shares outstanding (in shares)	96,732,466		96,732,466	96,732,466		1,000			96,732,466
Notes receivable
Financing Receivable, Past Due [Line Items]
Loss on note receivable				$ 19,000,000
Notes receivable | Minimum
Financing Receivable, Past Due [Line Items]
Period past due	60 days		60 days	60 days					60 days
Notes receivable | Maximum
Financing Receivable, Past Due [Line Items]
Period past due	120 days		120 days	120 days					120 days
Past due
Financing Receivable, Past Due [Line Items]
Financing receivables	$ 0		$ 0	$ 0					$ 0
[1]	Issuance of common shares to DTE Energy in anticipation of the Separation.
[2]	Issuance of common shares at $0.01 par value upon conversion to C Corporation from a single member LLC.

Significant Accounting Polici_5

Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details) - Notes receivable $ in Millions	Jun. 30, 2021USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 0
2020	0
2019 and prior	15
Total	15
Internal grade 1
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019 and prior	4
Total	4
Internal grade 2
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019 and prior	0
Total	0
Internal grade 3
Financing Receivable, Credit Quality Indicator [Line Items]
2021	0
2020	0
2019 and prior	11
Total	$ 11

Revenue (Disaggregation of Reve

Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Operating revenues	$ 208	$ 174	$ 405	$ 343
Lease revenue outside scope of Topic 606	2	2	4	4
Pipeline
Disaggregation of Revenue [Line Items]
Operating revenues	75	57	150	113
Gathering
Disaggregation of Revenue [Line Items]
Operating revenues	$ 133	$ 117	$ 255	$ 230

Revenue (Deferred Revenue) (Det

Revenue (Deferred Revenue) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)
Change In Contract With Customer, Liability, Rollforward [Roll Forward]
Beginning Balance	$ 22
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period	2
Revenue recognized that was included in the deferred revenue balance at the beginning of the period	(2)
Ending Balance	$ 22

Revenue (Expected Recognition o

Revenue (Expected Recognition of Deferred Revenue) (Details) $ in Millions	Jun. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 22
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 2
Remaining performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 3
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 3
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 3
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	$ 3
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	$ 8
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	Jun. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 22
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 2
Remaining performance obligation, expected timing of satisfaction	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 3
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 3
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 3
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	$ 3
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	$ 8
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 462
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 43
Remaining performance obligation, expected timing of satisfaction	6 months
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 85
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 77
Remaining performance obligation, expected timing of satisfaction	1 year
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	$ 68
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	$ 63
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	$ 126
Remaining performance obligation, expected timing of satisfaction

Fair Value (Details)

Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, gross	$ 3,100
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - Due from DTE Energy/Related party	4	$ 263
Short-term notes receivable - Third party	6	11
Long-term notes receivable - Third party	5	15
Long-term notes receivable - Related party	0	4
Short-term borrowings due to DTE Energy		3,175
Long-term debt	3,047	0
Fair value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - Due from DTE Energy/Related party	0	0
Short-term notes receivable - Third party	0	0
Long-term notes receivable - Third party	0	0
Long-term notes receivable - Related party	0	0
Short-term borrowings due to DTE Energy		0
Long-term debt	0	0
Fair value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - Due from DTE Energy/Related party	0	0
Short-term notes receivable - Third party	0	0
Long-term notes receivable - Third party	0	0
Long-term notes receivable - Related party	0	0
Short-term borrowings due to DTE Energy		0
Long-term debt	3,134	0
Fair value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term notes receivable - Due from DTE Energy/Related party	4	292
Short-term notes receivable - Third party	6	11
Long-term notes receivable - Third party	5	15
Long-term notes receivable - Related party	0	4
Short-term borrowings due to DTE Energy		3,517
Long-term debt	$ 0	$ 0

Debt (Details Textuals)

Debt (Details Textuals)	Jul. 01, 2021USD ($)	Jun. 10, 2021USD ($)	Sep. 30, 2021	Jun. 30, 2021USD ($)	Jun. 09, 2021USD ($)
Senior Notes
Line Of Credit Facility [Line Items]
Long-term debt issued				$ 2,100,000,000
4.125% Senior Notes due 2029 | Senior Notes
Line Of Credit Facility [Line Items]
Long-term debt issued					$ 1,100,000,000
4.375% Senior Notes due 2031 | Senior Notes
Line Of Credit Facility [Line Items]
Long-term debt issued					$ 1,000,000,000
Variable rate Term Loan Facility due 2028
Line Of Credit Facility [Line Items]
Long-term debt issued		$ 1,000,000,000		1,000,000,000
Debt instrument, term		7 years
Variable rate Term Loan Facility due 2028 | Forecast
Line Of Credit Facility [Line Items]
Minimum Debt Service Coverage Ratio			1.1
Revolving Credit Facility, expiring June 2026 | Forecast
Line Of Credit Facility [Line Items]
Maximum Consolidated Net Leverage Ratio			5
Minimum Interest Coverage ratio			2.5
Revolving Credit Facility, expiring June 2026 | Revolving credit facility
Line Of Credit Facility [Line Items]
Debt instrument, term		5 years
Maximum borrowing capacity		$ 750,000,000
Current borrowing capacity				33,000,000
Amount outstanding				0
Remaining borrowing capacity				25,000,000
Fees incurred				7,000,000
Revolving Credit Facility, expiring June 2026 | Revolving credit facility | Subsequent Event
Line Of Credit Facility [Line Items]
Proceeds from lines of credit	$ 25,000,000
Revolving Credit Facility, expiring June 2026 | Letter of credit
Line Of Credit Facility [Line Items]
Amount outstanding				$ 8,000,000

Debt (Long-term Debt Outstandin

Debt (Long-term Debt Outstanding) (Details) - USD ($) $ in Millions	Jun. 10, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 3,100
Unamortized debt discount		(5)
Unamortized debt issuance costs		(48)
Long-term debt due within one year		(10)	$ 0
Total Long-term debt		$ 3,037	$ 0
4.125% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest Rate		4.125%
Long-term debt, gross		$ 1,100
4.375% Senior Notes due 2031 | Senior Notes
Debt Instrument [Line Items]
Interest Rate		4.375%
Long-term debt, gross		$ 1,000
Variable rate Term Loan Facility due 2028
Debt Instrument [Line Items]
Long-term debt, gross		1,000
Variable rate Term Loan Facility due 2028 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Variable rate Term Loan Facility due 2028 | LIBOR | Minimum
Debt Instrument [Line Items]
Variable rate	0.50%
Variable rate Term Loan Facility due 2028 | Six-month LIBOR
Debt Instrument [Line Items]
Long-term debt, gross	$ 900
Variable rate Term Loan Facility due 2028 | Three-month LIBOR
Debt Instrument [Line Items]
Long-term debt, gross		$ 100

Debt (Debt Maturities) (Details

Debt (Debt Maturities) (Details) $ in Millions	Jun. 30, 2021USD ($)
Debt Disclosure [Abstract]
Remainder of 2021	$ 5
2022	10
2023	10
2024	10
2025	10
2026 and Thereafter	3,055
Total	$ 3,100

Commitments and Contingencies (

Commitments and Contingencies (Details)	Jul. 01, 2021USD ($)	Jul. 01, 2021CAD ($)	Jun. 30, 2021USD ($)	Dec. 31, 2020USD ($)
Loss Contingencies [Line Items]
Maximum guarantor obligation				$ 0
Accrued contingent liabilities			$ 21,000,000	$ 23,000,000
Subsequent Event
Loss Contingencies [Line Items]
Maximum guarantor obligation	$ 10,000,000
Subsequent Event | Revolving Term Credit Facility | Vector
Loss Contingencies [Line Items]
Financing receivables		$ 70,000,000
Maximum potential payout under line of credit	$ 56,000,000

Segment and Related Informati_3

Segment and Related Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	$ 208	$ 174	$ 405	$ 343
Net Income Attributable to DT Midstream	68	71	146	142
Pipeline
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	75	57	150	113
Net Income Attributable to DT Midstream	44	37	86	72
Gathering
Segment Reporting, Revenue Reconciling Item [Line Items]
Operating revenues	133	117	255	230
Net Income Attributable to DT Midstream	$ 24	$ 34	$ 60	$ 70

Subsequent Event (Details Textu

Subsequent Event (Details Textuals)	Aug. 05, 2021$ / shares
Subsequent Event
Subsequent Event [Line Items]
Quarterly dividend approved (in dollars per share)	$ 0.60