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Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) site | Dec. 31, 2020 USD ($) site | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Recorded estimated minimum liability | $ 259,000 | $ 259,000 |  |
Environmental remediation regulatory assets | 247,000 | 247,000 |  |
Expected recovery from incentive mechanism |  | $ 40,000 |  |
Expected recovery from incentive mechanism (as a percent) |  | 90.00% |  |
Recovery through customer rates | 207,000 | $ 207,000 |  |
Recovery through customer rates (as a percent) |  | 100.00% |  |
Alleged criminal and civil violations fine | 10 |  |  |
Civil violations penalty | $ 3,500 |  |  |
Injunction period | 5 years |  |  |
Environmental remediation expense |  | $ 7,000 | $ 9,000 | $ 8,000
Cost may exceed recorded liability, material sites (up to) |  | 122,000 |  |
Cost may exceed recorded liability, immaterial sites |  | $ 8,000 |  |
Clean up (period) |  | 30 years |  |
Expected remediation costs for each of the next four years, low end of range |  | $ 9,000 |  |
Expected remediation costs for each of the next four years, high end of range |  | $ 20,000 |  |
Material sites |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Identified material sites (number) | site | 25 | 25 |  |
Minimum estimated liability |  | $ 1,000 |  |
Recorded estimated minimum liability | $ 255,000 | 255,000 |  |
Material sites | San Onofre |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Recorded estimated minimum liability | 173,000 | $ 173,000 |  |
Immaterial sites |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Immaterial sites (number) | site |  | 15 |  |
Immaterial sites | Minimum |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Recorded estimated minimum liability | 4,000 | $ 4,000 |  |
Mission Canyon Incident |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |
Recorded estimated minimum liability | $ 8,000 | 8,000 |  |
Environmental remediation expense |  | $ 7,000 |  |

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- Definition The potential estimated cleanup costs for immaterial sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
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