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Fair Value (Realized Gains and Losses and Proceeds from Sale of Securities by Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Realized gains | $ 27 | $ 11 | $ 40 | $ 41
Realized losses | (9) | (6) | (26) | (22)
Proceeds from sale of securities | $ 221 | $ 91 | $ 592 | $ 438

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