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Significant Accounting Policies (Schedule of Other Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |
Allowance for equity funds used during construction | $ 42 | $ 29 | $ 27
Contract services | 26 | 28 | 27
Investment income | 17 | 3 | 14
Equity earnings (losses) of equity method investees | 3 | (14) | 38
Income from REF entities | 0 | 0 | 141
Other | 14 | 12 | 7
Other income | 102 | 58 | 254
DTE Electric |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |
Allowance for equity funds used during construction | 40 | 26 | 25
Contract services | 25 | 27 | 27
Investment income | 11 | 3 | 10
Other | 11 | 9 | 9
Other income | $ 87 | $ 65 | $ 71

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