Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 3,527	$ 2,906	$ 11,386	$ 9,021
Operating segments | Electric
Disaggregation of Revenue [Line Items]
Revenues	2,051	1,697	5,196	4,783
Operating segments | Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	968	946	2,421	2,390
Operating segments | Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	606	632	1,671	1,759
Operating segments | Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	169	189	493	559
Operating segments | Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	308	(70)	611	75
Operating segments | Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	14	2	23	11
Operating segments | Gas
Disaggregation of Revenue [Line Items]
Revenues	209	230	1,401	1,230
Operating segments | Gas | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	112	125	1,033	891
Operating segments | Gas | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	44	45	186	180
Operating segments | Gas | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	15	15	62	60
Operating segments | Gas | Other
Disaggregation of Revenue [Line Items]
Revenues	38	45	120	99
Operating segments | DTE Vantage
Disaggregation of Revenue [Line Items]
Revenues	163	190	520	555
Operating segments | Energy Trading
Disaggregation of Revenue [Line Items]
Revenues	$ 1,179	$ 840	$ 4,529	$ 2,610