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Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (88) | $ (98)
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 8 | 4
Long-term intangible assets |  |
Gross Carrying Value | 254 | 275
Accumulated Amortization | (88) | (98)
Net Carrying Value | 166 | 177
Renewable energy credits |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 2 | 2
Carbon offsets |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 6 | 2
Contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 246 | 271
Accumulated Amortization | (88) | (98)
Net Carrying Value | 158 | 173
Long-term intangible assets |  |
Accumulated Amortization | (88) | $ (98)
Contract intangibles | DTE Vantage |  |
Finite-Lived Intangible Assets [Line Items] |  |
Write-off of fully amortized assets, gross carrying value | 25 |
Write-off of fully amortized assets, accumulated amortization | $ 25 |
Contract intangibles | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives | 12 years |
Contract intangibles | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives | 26 years |

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