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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | $ 22 | $ 20 | $ 46 | $ 38
Contract services | 11 | 6 | 20 | 13
Equity earnings of equity method investees | 4 | 32 | 11 | 24
Investment income | 7 | 3 | 8 | 9
Other | 5 | 4 | 8 | 8
Total other income | 49 | 65 | 93 | 92
DTE Electric |  |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | 22 | 19 | 46 | 37
Contract services | 11 | 7 | 20 | 13
Investment income | 6 | 2 | 7 | 7
Other | 3 | 4 | 5 | 7
Total other income | $ 42 | $ 32 | $ 78 | $ 64

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