Segment and Related Information (Inter-segment Billing for Goods and Services) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Segment Reporting [Line Items]
Operating revenues	$ (3,727)	$ (3,527)	$ (12,237)	$ (11,386)
Inter-segment billing relating to Non-utility operations	(1,457)	(1,304)	(5,300)	(4,877)
Reclassifications and Eliminations
Segment Reporting [Line Items]
Operating revenues	83	75	270	260
Inter-segment billing relating to Non-utility operations	58	52	197	195
Reclassifications and Eliminations | Electric segment
Segment Reporting [Line Items]
Operating revenues	18	17	53	53
Inter-segment billing relating to Non-utility operations	1	1	3	3
Reclassifications and Eliminations | Gas segment
Segment Reporting [Line Items]
Operating revenues	8	7	22	15
Reclassifications and Eliminations | DTE Vantage segment
Segment Reporting [Line Items]
Operating revenues	17	7	66	58
Reclassifications and Eliminations | Energy Trading segment
Segment Reporting [Line Items]
Operating revenues	$ 40	$ 44	$ 129	$ 134