Income Taxes (Deferred Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	$ (3,695)	$ (3,423)
Regulatory assets and liabilities	(1,272)	(1,158)
Tax credit carryforwards	1,604	1,519
Pension and benefits	55	77
Federal net operating loss carryforward	190	202
State and local net operating loss carryforwards	68	76
Investments in equity method investees	(28)	(33)
Other	145	130
Deferred tax assets (liabilities)	(2,933)	(2,610)
Less: Valuation allowance	(25)	(39)
Long-term deferred income tax liabilities	(2,958)	(2,649)
Deferred income tax assets	2,508	2,415
Deferred income tax liabilities	(5,466)	(5,064)
DTE Electric
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant, and equipment	(2,788)	(2,693)
Regulatory assets and liabilities	(1,492)	(1,314)
Tax credit carryforwards	583	572
Pension and benefits	62	69
Federal net operating loss carryforward	30	71
State and local net operating loss carryforwards	42	49
Investments in equity method investees	(1)	0
Other	176	137
Deferred tax assets (liabilities)	(3,388)	(3,109)
Less: Valuation allowance	(5)	0
Long-term deferred income tax liabilities	(3,393)	(3,109)
Deferred income tax assets	1,209	1,202
Deferred income tax liabilities	$ (4,602)	$ (4,311)