Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Operating Revenues	$ (2,875)	$ (2,684)	$ (6,115)	$ (6,463)
Reconciliation and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	48	49	106	108
Reconciliation and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues	18	18	36	35
Reconciliation and Eliminations | Gas
Segment Reporting Information [Line Items]
Operating Revenues	3	4	7	9
Reconciliation and Eliminations | DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues	7	9	18	19
Reconciliation and Eliminations | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues	20	18	45	45
Reconciliation and Eliminations | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues	$ 0	$ 0	$ 0	$ 0