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Financial and Other Derivative Instruments (Details Textuals) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, gross | $ 609 | $ 694
Letters of credit issued that could be used to offset net derivative liabilities | 1 | 1
Letters of credit received that could be used to offset net derivative assets | 9 | 0
Contractual obligation to post collateral in event of downgrade to below investment grade | 342 |
Derivative net liability position aggregate fair value | 416 |
Collateral already posted fair value | 0 |
Derivative net asset position, fair value | 380 |
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions | 36 |
Derivatives not designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, gross | 609 | 674
Other current assets | Derivative assets — FTRs | Derivatives not designated as hedging instruments | DTE Electric |  |
Derivatives, Fair Value [Line Items] |  |
Total derivative assets, gross | $ 18 | $ 9

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