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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Schedule of Other Nonoperating Income, by Component [Line Items] |  |
Allowance for equity funds used during construction | $ 18 | $ 9
Contract services | 7 | 6
Investment income | 6 | 5
Equity earnings (losses) of equity method investees | (8) | 4
Other | 4 | 2
Total other income | 27 | 26
DTE Electric |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |
Allowance for equity funds used during construction | 18 | 9
Contract services | 6 | 6
Investment income | 5 | 3
Other | 3 | 2
Total other income | $ 32 | $ 20

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