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Significant Accounting Policies (Cloud Computing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | $ 12 | $ 10 | $ 4
Gross value of capitalized cloud computing costs | 64 | 56 |
Accumulated amortization of capitalized cloud computing costs | 27 | 15 |
DTE Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | 10 | 8 | $ 3
Gross value of capitalized cloud computing costs | 51 | 44 |
Accumulated amortization of capitalized cloud computing costs | $ 22 | $ 12 |

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