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Significant Accounting Policies (Other Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | $ 9 | $ 6 | $ 18 | $ 14
Contract services | 7 | 7 | 13 | 14
Investment income | 4 | 0 | 9 | 0
Equity earnings (losses) of equity method investees | 0 | (4) | 4 | (15)
Other | 11 | 2 | 13 | 6
Total other income | 31 | 11 | 57 | 19
DTE Electric |  |  |  |
Schedule of Other Nonoperating Income, by Component [Line Items] |  |  |  |
Allowance for equity funds used during construction | 8 | 5 | 17 | 12
Contract services | 6 | 7 | 12 | 14
Investment income | 3 | 0 | 6 | 0
Other | 3 | 3 | 5 | 5
Total other income | $ 20 | $ 15 | $ 40 | $ 31

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