Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 3,369	$ 3,419	$ 8,510	$ 7,859
Operating segments \| Electric
Disaggregation of Revenue [Line Items]
Revenues	1,775	1,686	3,519	3,145
Operating segments \| Electric \| Residential
Disaggregation of Revenue [Line Items]
Revenues	817	733	1,597	1,453
Operating segments \| Electric \| Commercial
Disaggregation of Revenue [Line Items]
Revenues	629	536	1,201	1,065
Operating segments \| Electric \| Industrial
Disaggregation of Revenue [Line Items]
Revenues	200	164	367	324
Operating segments \| Electric \| Other
Disaggregation of Revenue [Line Items]
Revenues	129	253	354	303
Operating segments \| Electric \| Other \| DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	24	4	51	9
Operating segments \| Gas segment
Disaggregation of Revenue [Line Items]
Revenues	315	316	1,247	1,192
Operating segments \| Gas segment \| Gas sales
Disaggregation of Revenue [Line Items]
Revenues	225	229	920	921
Operating segments \| Gas segment \| End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	53	51	144	142
Operating segments \| Gas segment \| Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	16	55	47
Operating segments \| Gas segment \| Other
Disaggregation of Revenue [Line Items]
Revenues	21	20	128	82
Operating segments \| DTE Vantage segment
Disaggregation of Revenue [Line Items]
Revenues	200	169	427	357
Operating segments \| Energy Trading segment
Disaggregation of Revenue [Line Items]
Revenues	$ 1,153	$ 1,324	$ 3,504	$ 3,350