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Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions | 9 Months Ended
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Sep. 30, 2023 USD ($) site | Sep. 30, 2022 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |
Recorded estimated minimum liability | $ 254 |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent |
Environmental remediation regulatory assets | $ 233 |
Expected recovery from incentive mechanism | $ 36 |
Expected recovery from incentive mechanism (percent) | 90.00% |
Recovery through customer rates | $ 197 |
Recovery through customer rates (percent) | 100.00% |
Environmental remediation expense | $ 9 | $ 5
Clean up (period) | 40 years |
Expected remediation costs, low end of range | $ 9 |
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 | 251 |
Cost may exceed liability | 120 |
Material sites | San Onofre |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Recorded estimated minimum liability | $ 159 |
Immaterial sites |  |
Jointly Owned Utility Plant Interests [Line Items] |  |
Identified remediation sites (number) | site | 12 |
Recorded estimated minimum liability | $ 3 |
Cost may exceed liability | $ 5 |

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