Income Taxes (Reconciliation of Income Tax Expense to the Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Entity Information [Line Items]
Income Before Income Taxes	$ 1,370	$ 1,566	$ 1,112
Income tax expense at 21% statutory rate	288	329	234
Production tax credits	(169)	(91)	(91)
Investment tax credits	(128)	(44)	(1)
TCJA regulatory liability amortization	(66)	(63)	(155)
AFUDC equity	(17)	(7)	(5)
State and local income taxes, net of federal benefit	59	59	42
Other, net	(1)	(14)	5
Income Tax Expense (Benefit)	$ (34)	$ 169	$ 29
Effective income tax rate	(2.50%)	10.80%	2.60%
Inflation and Reduction Act of 2022, tax credit	$ 231
Nuclear tax credit	89
DTE Electric
Entity Information [Line Items]
Income Before Income Taxes	1,040	$ 850	$ 981
Income tax expense at 21% statutory rate	218	179	206
Production tax credits	(162)	(79)	(83)
Investment tax credits	(70)	(1)	(1)
TCJA regulatory liability amortization	(55)	(53)	(145)
AFUDC equity	(16)	(7)	(4)
State and local income taxes, net of federal benefit	57	45	56
Other, net	(4)	(6)	(3)
Income Tax Expense (Benefit)	$ (32)	$ 78	$ 26
Effective income tax rate	(3.10%)	9.20%	2.70%
Inflation and Reduction Act of 2022, tax credit	$ 231
Nuclear tax credit	$ 89