Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax benefit
Federal	$ (10)	$ (13)	$ (33)
State and other income tax	(2)	(2)	(12)
Total current income taxes	(12)	(15)	(45)
Deferred income tax expense (benefit)
Federal	103	(13)	(42)
State and other income tax	78	57	(43)
Total deferred income taxes	181	44	(85)
Income Tax Expense (Benefit)	169	29	(130)
DTE Electric
Current income tax benefit
Federal	1	1	(11)
State and other income tax	(5)	0	(7)
Total current income taxes	(4)	1	(18)
Deferred income tax expense (benefit)
Federal	19	(46)	47
State and other income tax	63	71	75
Total deferred income taxes	82	25	122
Income Tax Expense (Benefit)	$ 78	$ 26	$ 104