Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income (loss) from continuing operations before income tax expense (benefit)
US	$ 1,543	$ 1,357	$ 1,559
Foreign	7	13	7
Income Before Income Taxes	1,550	1,370	1,566
Current tax expense (benefit)
US federal	(269)	(229)	(10)
US state and local	(3)	(2)	(2)
Foreign	2	3	0
Total current tax expense (benefit)	(270)	(228)	(12)
Deferred tax expense (benefit)
US federal	253	116	103
US state and local	105	77	76
Foreign	0	1	2
Total deferred tax expense (benefit)	358	194	181
Total tax expense (benefit)
US federal	(16)	(113)	93
US state and local	102	75	74
Foreign	2	4	2
Income Tax Expense (Benefit) at Effective Tax Rate	88	(34)	169
DTE Electric
Income (loss) from continuing operations before income tax expense (benefit)
US	1,223	1,040	850
Income Before Income Taxes	1,223	1,040	850
Current tax expense (benefit)
US federal	(268)	(228)	1
US state and local	0	0	(5)
Total current tax expense (benefit)	(268)	(228)	(4)
Deferred tax expense (benefit)
US federal	256	124	19
US state and local	83	72	63
Total deferred tax expense (benefit)	339	196	82
Total tax expense (benefit)
US federal	(12)	(104)	20
US state and local	83	72	58
Income Tax Expense (Benefit) at Effective Tax Rate	$ 71	$ (32)	$ 78