Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	$ (3,423)	$ (3,897)
Regulatory assets and liabilities	(1,158)	(493)
Tax credit carryforwards	1,519	1,378
Pension and benefits	77	111
Federal net operating loss carryforward	202	266
State and local net operating loss carryforwards	76	97
Investments in equity method investees	(33)
Investments in equity method investees		65
Other	130	137
Deferred tax assets (liabilities)	(2,610)	(2,336)
Less: Valuation allowance	(39)	(58)
Long-term deferred income tax liabilities	(2,649)	(2,394)
Deferred income tax assets	2,415	2,317
Deferred income tax liabilities	(5,064)	(4,711)
DTE Electric
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	(2,693)	(3,188)
Regulatory assets and liabilities	(1,314)	(589)
Tax credit carryforwards	572	487
Pension and benefits	69	103
Federal net operating loss carryforward	71	58
State and local net operating loss carryforwards	49	38
Investments in equity method investees	0
Investments in equity method investees		0
Other	137	145
Deferred tax assets (liabilities)	(3,109)	(2,946)
Less: Valuation allowance	0	0
Long-term deferred income tax liabilities	(3,109)	(2,946)
Deferred income tax assets	1,202	1,081
Deferred income tax liabilities	$ (4,311)	$ (4,027)