Segment and Related Information (Inter-segment Billing for Goods and Services) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ (3,527)	$ (2,906)	$ (11,386)	$ (9,021)
Inter-segment billing relating to Non-utility operations	(1,304)	(1,003)	(4,877)	(3,083)
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating revenues	75	51	260	157
Inter-segment billing relating to Non-utility operations	52	29	195	93
Reclassifications and Eliminations | Electric segment
Segment Reporting Information [Line Items]
Operating revenues	17	18	53	54
Reclassifications and Eliminations | Gas segment
Segment Reporting Information [Line Items]
Operating revenues	7	5	15	12
Reclassifications and Eliminations | DTE Vantage segment
Segment Reporting Information [Line Items]
Operating revenues	7	7	58	25
Reclassifications and Eliminations | Energy Trading segment
Segment Reporting Information [Line Items]
Operating revenues	$ 44	$ 21	$ 134	$ 66