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Significant Accounting Policies (Cloud Computing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | $ 10 | $ 4 | $ 1
Gross value of capitalized cloud computing costs | 56 | 42 |
Accumulated amortization of capitalized cloud computing costs | 15 | 5 |
DTE Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | 8 | 3 | $ 1
Gross value of capitalized cloud computing costs | 44 | 33 |
Accumulated amortization of capitalized cloud computing costs | $ 12 | $ 4 |

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