Income Taxes (Reconciliation of Income Tax Expense to the Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 656	$ 1,082	$ 1,013
Income tax expense at 21% statutory rate	138	227	213
Production tax credits	(138)	(121)	(128)
TCJA regulatory liability amortization	(103)	(76)	(38)
State deferred tax remeasurement due to separation of DT Midstream, net of federal benefit	(85)	0	0
Investment tax credits	(3)	(4)	(4)
Net operating loss carryback	0	(34)	0
Enactment of West Virginia income tax legislation, net of federal benefit	8	0	0
Deferred intercompany gain	9	0	0
Valuation allowance on charitable contribution carryforwards	18	3	6
State and local income taxes, excluding items above, net of federal benefit	30	47	29
Other, net	(4)	(5)	(7)
Income Tax Expense (Benefit)	$ (130)	$ 37	$ 71
Effective income tax rate	(19.90%)	3.40%	7.00%
DTE Electric
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income Before Income Taxes	$ 970	$ 887	$ 854
Income tax expense at 21% statutory rate	204	186	179
Production tax credits	(70)	(55)	(45)
TCJA regulatory liability amortization	(73)	(62)	(35)
Investment tax credits	(3)	(4)	(4)
State and local income taxes, excluding items above, net of federal benefit	54	50	49
Other, net	(8)	(6)	(6)
Income Tax Expense (Benefit)	$ 104	$ 109	$ 138
Effective income tax rate	10.70%	12.30%	16.20%