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Significant Accounting Policies (Schedule of Other Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |
Allowance for equity funds used during construction | $ 86 | $ 42 | $ 29
Contract services | 34 | 26 | 28
Investment income | 17 | 17 | 3
Equity earnings (losses) of equity method investees | 15 | 3 | (14)
Other | 15 | 14 | 12
Other income | 167 | 102 | 58
DTE Electric |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |
Allowance for equity funds used during construction | 84 | 40 | 26
Contract services | 33 | 25 | 27
Investment income | 13 | 11 | 3
Other | 14 | 11 | 9
Other income | $ 144 | $ 87 | $ 65

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