Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 3,419	$ 2,875	$ 7,859	$ 6,115
Operating segments \| Electric
Disaggregation of Revenue [Line Items]
Revenues	1,686	1,616	3,145	3,086
Operating segments \| Electric \| Residential
Disaggregation of Revenue [Line Items]
Revenues	733	744	1,453	1,444
Operating segments \| Electric \| Commercial
Disaggregation of Revenue [Line Items]
Revenues	536	571	1,065	1,127
Operating segments \| Electric \| Industrial
Disaggregation of Revenue [Line Items]
Revenues	164	187	324	370
Operating segments \| Electric \| Other
Disaggregation of Revenue [Line Items]
Revenues	253	114	303	145
Operating segments \| Electric \| Other \| DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	4	5	9	9
Operating segments \| Gas
Disaggregation of Revenue [Line Items]
Revenues	316	289	1,192	1,000
Operating segments \| Gas \| Gas sales
Disaggregation of Revenue [Line Items]
Revenues	229	201	921	766
Operating segments \| Gas \| End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	51	53	142	135
Operating segments \| Gas \| Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	16	47	45
Operating segments \| Gas \| Other
Disaggregation of Revenue [Line Items]
Revenues	20	19	82	54
Operating segments \| DTE Vantage
Disaggregation of Revenue [Line Items]
Revenues	169	181	357	365
Operating segments \| Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	$ 1,324	$ 837	$ 3,350	$ 1,770