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Fair Value (Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Realized gains | $ 5 | $ 19 | $ 24 | $ 65
Realized losses | (6) | (19) | (32) | (42)
Proceeds from sale of securities | $ 104 | $ 194 | $ 527 | $ 707

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