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Summary of Significant Accounting Policies (PPE) (Details) - SCE - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 2,000 | $ 1,800 | $ 1,700
Depreciation expense based on cost (as a percent) | 3.70% | 3.60% | 3.60%
AFUDC equity capitalized during construction | $ 118 | $ 121 | $ 101
Potential impairment | 186 |  |
Other income |  |  |
Property, Plant and Equipment [Line Items] |  |  |
AFUDC equity capitalized during construction | 118 | 121 | 101
Interest expense |  |  |
Property, Plant and Equipment [Line Items] |  |  |
AFUDC debt capitalized during construction | 50 | $ 53 | $ 63
2021 General Rate Case |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Asset impairment | 79 |  |
Asset impairment, net of tax | $ 47 |  |
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 | 36 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 | 45 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 | 54 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 | 26 years |  |

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