Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income tax expense (benefit)
Federal	$ (33)	$ (249)	$ (183)
State and other income tax	(12)	4	3
Total current income taxes	(45)	(245)	(180)
Deferred income tax expense (benefit)
Federal	(42)	227	218
State and other income tax	(43)	55	33
Total deferred income taxes	(85)	282	251
Income Tax Expense (Benefit)	(130)	37	71
DTE Electric
Current income tax expense (benefit)
Federal	(11)	15	25
State and other income tax	(7)	5	16
Total current income taxes	(18)	20	41
Deferred income tax expense (benefit)
Federal	47	30	51
State and other income tax	75	59	46
Total deferred income taxes	122	89	97
Income Tax Expense (Benefit)	$ 104	$ 109	$ 138