Segment and Related Information (Inter-segment Billing for Goods and Services) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating revenues	$ (15,814)	$ (12,457)	$ (12,745)
Inter-segment billing relating to Non-utility operations	(6,965)	(4,467)	(5,279)
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating revenues	346	230	242
Inter-segment billing relating to Non-utility operations	258	145	156
Reclassifications and Eliminations | Electric segment
Segment Reporting Information [Line Items]
Operating revenues	71	71	72
Inter-segment billing relating to Non-utility operations	4	3	3
Reclassifications and Eliminations | Gas segment
Segment Reporting Information [Line Items]
Operating revenues	22	16	17
Reclassifications and Eliminations | DTE Vantage segment
Segment Reporting Information [Line Items]
Operating revenues	77	43	68
Reclassifications and Eliminations | Energy Trading segment
Segment Reporting Information [Line Items]
Operating revenues	$ 176	$ 100	$ 85