Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 3,727	$ 3,527	$ 12,237	$ 11,386
Operating segments | Electric
Disaggregation of Revenue [Line Items]
Revenues	2,103	2,051	5,622	5,196
Operating segments | Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	1,146	968	2,743	2,421
Operating segments | Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	714	606	1,915	1,671
Operating segments | Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	209	169	576	493
Operating segments | Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	34	308	388	611
Operating segments | Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	22	14	73	23
Operating segments | Gas segment
Disaggregation of Revenue [Line Items]
Revenues	214	209	1,461	1,401
Operating segments | Gas segment | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	138	112	1,058	1,033
Operating segments | Gas segment | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	48	44	192	186
Operating segments | Gas segment | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	16	15	71	62
Operating segments | Gas segment | Other
Disaggregation of Revenue [Line Items]
Revenues	12	38	140	120
Operating segments | DTE Vantage segment
Disaggregation of Revenue [Line Items]
Revenues	201	163	628	520
Operating segments | Energy Trading segment
Disaggregation of Revenue [Line Items]
Revenues	$ 1,292	$ 1,179	$ 4,796	$ 4,529