Revenue (Revenues Outside the Scope of Topic 606) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Leases	$ 14	$ 12	$ 29	$ 26
Operating segments \| Electric
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	0	0	1	0
Other revenues	5	5	10	9
Operating segments \| Gas
Disaggregation of Revenue [Line Items]
Alternative Revenue Program	0	2	0	8
Other revenues	4	4	7	6
Operating segments \| DTE Vantage
Disaggregation of Revenue [Line Items]
Leases	14	12	29	26
Operating segments \| Energy Trading
Disaggregation of Revenue [Line Items]
Derivatives	$ 966	$ 586	$ 2,465	$ 1,245

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

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