Income Taxes (Reconciliation of Income Tax Expense to the Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Entity Information [Line Items]
Income Before Income Taxes	$ 1,566	$ 1,112	$ 656
Income tax expense at 21% statutory rate	329	234	138
Production tax credits	(91)	(91)	(138)
TCJA regulatory liability amortization	(63)	(155)	(103)
Investment tax credits	(44)	(1)	(3)
Enactment of state income tax legislation, net of federal benefit	(1)	0	8
State deferred tax remeasurement due to separation of DT Midstream, net of federal benefit	0	0	(85)
Valuation allowance on charitable contribution carryforwards	0	9	18
State and local income taxes, excluding items above, net of federal benefit	59	42	30
Other, net	(20)	(9)	5
Income Tax Expense (Benefit)	$ 169	$ 29	$ (130)
Effective income tax rate	10.80%	2.60%	(19.90%)
DTE Electric
Entity Information [Line Items]
Income Before Income Taxes	$ 850	$ 981	$ 970
Income tax expense at 21% statutory rate	179	206	204
Production tax credits	(79)	(83)	(70)
TCJA regulatory liability amortization	(53)	(145)	(73)
State and local income taxes, excluding items above, net of federal benefit	45	56	54
Other, net	(14)	(8)	(11)
Income Tax Expense (Benefit)	$ 78	$ 26	$ 104
Effective income tax rate	9.20%	2.70%	10.70%