Segment and Related Information (Inter-segment Billing for Goods and Services) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Operating revenues	$ (5,141)	$ (4,440)
Inter-segment billing relating to Non-utility operations	(2,518)	(2,133)
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating revenues	113	109
Inter-segment billing relating to Non-utility operations	87	86
Reclassifications and Eliminations | Electric segment
Segment Reporting Information [Line Items]
Operating revenues	19	19
Inter-segment billing relating to Non-utility operations	1	1
Reclassifications and Eliminations | Gas segment
Segment Reporting Information [Line Items]
Operating revenues	8	4
Reclassifications and Eliminations | DTE Vantage segment
Segment Reporting Information [Line Items]
Operating revenues	36	40
Reclassifications and Eliminations | Energy Trading segment
Segment Reporting Information [Line Items]
Operating revenues	$ 50	$ 46