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Summary of Significant Accounting Policies (PPE) (Details) - SCE - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Aug. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Property, Plant and Equipment [Line Items] |  |  |  |  |
Depreciation |  |  | $ 2,500 | $ 2,000 | $ 1,800
Depreciation expense based on cost (as a percent) |  |  | 4.20% | 3.70% | 3.60%
AFUDC equity capitalized during construction |  |  | $ 137 | $ 118 | $ 121
Impairment and other expense | $ 47 | $ 79 |  |  |
Asset impairment, net of tax | $ 34 | $ 47 |  |  |
Potential impairment |  |  | 177 | 186 |
Other income. |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
AFUDC equity capitalized during construction |  |  | 137 | 118 | 121
Interest expense |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
AFUDC debt capitalized during construction |  |  | $ 53 | $ 50 | $ 53
Generation plant | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 10 years |  |
Generation plant | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 55 years |  |
Generation plant | Weighted Average |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 39 years |  |
Distribution plant | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 20 years |  |
Distribution plant | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 67 years |  |
Distribution plant | Weighted Average |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 50 years |  |
Transmission plant | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 30 years |  |
Transmission plant | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 65 years |  |
Transmission plant | Weighted Average |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 53 years |  |
General plant and other | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 5 years |  |
General plant and other | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 60 years |  |
General plant and other | Weighted Average |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated Useful Lives |  |  | 20 years |  |

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