Dispositions and Impairments (Details)		1 Months Ended			3 Months Ended	6 Months Ended
	Jul. 01, 2021 shares	Aug. 31, 2021 USD ($)	Jul. 27, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued				$ 4,100,000,000	$ 4,100,000,000	$ 4,100,000,000
Redemption of long-term debt						583,000,000	$ 300,000,000
Cumulative transaction costs incurred				43,000,000	43,000,000	43,000,000
Transaction costs					24,000,000	34,000,000
Power and Industrial Projects
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge					27,000,000	27,000,000
Power and Industrial Projects | Property, plant and equipment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets held for use					18,000,000	18,000,000
Power and Industrial Projects | Other noncurrent assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of long-lived assets held for use					9,000,000	9,000,000
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Redemption of long-term debt			$ 2,247,000,000
Subsequent Event | Maximum | DT Midstream | Discontinued operations, spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transition Services Agreement period	24 months
Subsequent Event | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Redemption of long-term debt		$ 374,000,000
DT Midstream
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discount and debt issuance costs				53,000,000	53,000,000	53,000,000
Cash payment for dividend to DTE Energy				501,000,000
DT Midstream | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of shares (in shares) | shares	96,732,466
Share distribution ratio	0.5
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued				1,000,000,000	1,000,000,000	1,000,000,000
DT Midstream | Senior Notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term debt issued				2,100,000,000	$ 2,100,000,000	$ 2,100,000,000
DT Midstream | Affiliates
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash payment for 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