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Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) site | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Recorded estimated minimum liability | $ 260 |  |
Environmental remediation regulatory assets | 242 |  |
Expected recovery from incentive mechanism | $ 39 |  |
Expected recovery from incentive mechanism (percent) | 90.00% |  |
Recovery through customer rates | $ 203 |  |
Recovery through customer rates (percent) | 100.00% |  |
Environmental remediation expense | $ 9 | $ 7 | $ 9
Clean up (period) | 40 years |  |
Expected remediation costs, low end of range | $ 7 |  |
Expected remediation costs, high end of range | $ 26 |  |
Material sites |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Identified remediation sites (number) | site | 26 |  |
Minimum estimated liability | $ 1 |  |
Recorded estimated minimum liability | 257 |  |
Cost may exceed liability | 114 |  |
Material sites | San Onofre |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Recorded estimated minimum liability | $ 169 |  |
Immaterial sites |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |
Identified remediation sites (number) | site | 14 |  |
Recorded estimated minimum liability | $ 3 |  |
Cost may exceed liability | $ 9 |  |

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