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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Realized gains | $ 5 | $ 23 | $ 13 | $ 30
Realized losses | (9) | (10) | (17) | (16)
Proceeds from sale of securities | $ 232 | $ 239 | $ 371 | $ 347

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