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Revenue (Revenues Outside the Scope of Topic 606) (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]
Leases	$ 17	$ 19	$ 46	$ 45
Operating segments | Electric
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	0	0	1	0
Other revenues	7	11	17	20
Operating segments | Gas
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	0	1	0	9
Other revenues	2	3	9	9
Operating segments | DTE Vantage
Disaggregation of Revenue [Line Items]
Leases	17	19	46	45
Operating segments | Energy Trading
Disaggregation of Revenue [Line Items]
Derivatives	$ 778	$ 536	$ 3,243	$ 1,781

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