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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | $ 8 | $ 6 | $ 26 | $ 20
Contract services | 5 | 7 | 18 | 21
Investment income | 0 | 0 | 9 | 0
Equity earnings (losses) of equity method investees | 3 | 0 | 7 | (15)
Other | (3) | 3 | 10 | 9
Total other income | 13 | 16 | 70 | 35
DTE Electric |  |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | 8 | 6 | 25 | 18
Contract services | 6 | 7 | 18 | 21
Investment income | 0 | 0 | 6 | 0
Other | 2 | 2 | 7 | 7
Total other income | $ 16 | $ 15 | $ 56 | $ 46

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