Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	$ (3,897)	$ (3,826)
Regulatory assets and liabilities	(493)	(124)
Tax credit carry-forwards	1,378	1,260
Pension and benefits	111	102
Federal net operating loss carry-forward	266	199
State and local net operating loss carry-forwards	97	73
Investments in equity method investees	65	59
Other	137	145
Deferred tax assets (liabilities)	(2,336)	(2,112)
Less: Valuation allowance	(58)	(51)
Long-term deferred income tax liabilities	(2,394)	(2,163)
Deferred income tax assets	2,317	2,224
Deferred income tax liabilities	(4,711)	(4,387)
DTE Electric
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	(3,188)	(3,164)
Regulatory assets and liabilities	(589)	(230)
Tax credit carry-forwards	487	379
Pension and benefits	103	127
Federal net operating loss carry-forward	58	5
State and local net operating loss carry-forwards	38	15
Investments in equity method investees	0	(1)
Other	145	128
Deferred tax assets (liabilities)	(2,946)	(2,741)
Less: Valuation allowance	0	0
Long-term deferred income tax liabilities	(2,946)	(2,741)
Deferred income tax assets	1,081	988
Deferred income tax liabilities	$ (4,027)	$ (3,729)