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Significant Accounting Policies (Cloud Computing Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | $ 4 | $ 1 | $ 0
Gross value of capitalized cloud computing costs | 42 | 16 |
Accumulated amortization of capitalized cloud computing costs | 5 | 1 |
DTE Electric |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortization expense of capitalized cloud computing costs | 3 | 1 | $ 0
Gross value of capitalized cloud computing costs | 33 | 12 |
Accumulated amortization of capitalized cloud computing costs | $ 4 | $ 1 |

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