Revenue (Revenues Outside the Scope of Topic 606) (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]
Leases	$ 16	$ 17	$ 42	$ 46
Operating segments | Electric
Disaggregation of Revenue [Line Items]
Other revenues	9	7	27	17
Operating segments | Gas segment
Disaggregation of Revenue [Line Items]
Other revenues	3	2	11	9
Operating segments | DTE Vantage segment
Disaggregation of Revenue [Line Items]
Leases	16	17	42	46
Operating segments | Energy Trading segment
Disaggregation of Revenue [Line Items]
Derivatives	$ 795	$ 778	$ 3,198	$ 3,243