Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Operating Revenues	$ (2,906)	$ (2,888)	$ (9,021)	$ (9,351)
Reconciliation and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	51	57	157	165
Reconciliation and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues	18	20	54	55
Reconciliation and Eliminations | Gas
Segment Reporting Information [Line Items]
Operating Revenues	5	4	12	13
Reconciliation and Eliminations | DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	7	13	25	32
Reconciliation and Eliminations | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	21	20	66	65
Reconciliation and Eliminations | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	$ 0	$ 0	$ 0	$ 0