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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | $ 26 | $ 24 | $ 72 | $ 62
Contract services | 11 | 8 | 31 | 21
Equity earnings of equity method investees | 5 | 12 | 16 | 36
Investment income | 8 | 7 | 16 | 16
Other | 4 | 3 | 12 | 11
Total other income | 54 | 54 | 147 | 146
DTE Electric |  |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | 25 | 23 | 71 | 60
Contract services | 11 | 8 | 31 | 21
Investment income | 5 | 6 | 12 | 13
Other | 4 | 4 | 9 | 11
Total other income | $ 45 | $ 41 | $ 123 | $ 105

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