Segment and Related Information (Inter-segment Billing for Goods and Services) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ (3,419)	$ (2,875)	$ (7,859)	$ (6,115)
Inter-segment billing relating to Non-utility operations	(1,440)	(996)	(3,573)	(2,080)
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating revenues	76	48	185	106
Inter-segment billing relating to Non-utility operations	57	27	143	64
Reclassifications and Eliminations \| Electric segment
Segment Reporting Information [Line Items]
Operating revenues	17	18	36	36
Reclassifications and Eliminations \| Gas segment
Segment Reporting Information [Line Items]
Operating revenues	4	3	8	7
Reclassifications and Eliminations \| DTE Vantage segment
Segment Reporting Information [Line Items]
Operating revenues	11	7	51	18
Reclassifications and Eliminations \| Energy Trading segment
Segment Reporting Information [Line Items]
Operating revenues	$ 44	$ 20	$ 90	$ 45