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Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Components of Deferred Tax Assets and Liabilities [Abstract]    
Property, plant, and equipment $ (3,970) $ (3,691)
Regulatory assets and liabilities (117) (102)
Tax credit carry-forwards 1,260 1,144
Pension and benefits 310 310
Federal net operating loss carry-forward 199 109
State and local net operating loss carry-forwards 73 36
Investments in equity method investees 58 51
Other 75 115
Deferred tax assets (liabilities) (2,112) (2,028)
Less: Valuation allowance (51) (41)
Long-term deferred income tax liabilities (2,163) (2,069)
Deferred income tax assets 2,224 2,050
Deferred income tax liabilities (4,387) (4,119)
DTE Electric    
Components of Deferred Tax Assets and Liabilities [Abstract]    
Property, plant, and equipment (3,428) (3,099)
Regulatory assets and liabilities (64) (53)
Tax credit carry-forwards 379 278
Pension and benefits 282 264
Federal net operating loss carry-forward 5 0
State and local net operating loss carry-forwards 15 0
Investments in equity method investees (1) 0
Other 71 85
Deferred tax assets (liabilities) (2,741) (2,525)
Less: Valuation allowance 0 0
Long-term deferred income tax liabilities (2,741) (2,525)
Deferred income tax assets 988 883
Deferred income tax liabilities $ (3,729) $ (3,408)