Revenue (Disaggregation of Revenue By Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Revenues	$ 5,141	$ 4,440
Operating segments | Electric
Disaggregation of Revenue [Line Items]
Revenues	1,744	1,459
Operating segments | Electric | Residential
Disaggregation of Revenue [Line Items]
Revenues	780	720
Operating segments | Electric | Commercial
Disaggregation of Revenue [Line Items]
Revenues	572	529
Operating segments | Electric | Industrial
Disaggregation of Revenue [Line Items]
Revenues	167	160
Operating segments | Electric | Other
Disaggregation of Revenue [Line Items]
Revenues	225	50
Operating segments | Electric | Other | DTE Sustainable Generation
Disaggregation of Revenue [Line Items]
Revenues	27	5
Operating segments | Gas segment
Disaggregation of Revenue [Line Items]
Revenues	932	876
Operating segments | Gas segment | Gas sales
Disaggregation of Revenue [Line Items]
Revenues	695	692
Operating segments | Gas segment | End User Transportation
Disaggregation of Revenue [Line Items]
Revenues	91	91
Operating segments | Gas segment | Intermediate Transportation
Disaggregation of Revenue [Line Items]
Revenues	39	31
Operating segments | Gas segment | Other
Disaggregation of Revenue [Line Items]
Revenues	107	62
Operating segments | DTE Vantage segment
Disaggregation of Revenue [Line Items]
Revenues	227	188
Operating segments | Energy Trading segment
Disaggregation of Revenue [Line Items]
Revenues	$ 2,351	$ 2,026