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Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Jul. 31, 2019 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire insurance expense |  |  |  | $ 450,000,000 | $ 400,000,000 |
SCE |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire insurance coverage |  |  |  |  | 1,000,000,000.0 | $ 1,200,000,000
Co-insurance |  |  |  |  |  | 115,000,000
Self insurance |  |  |  |  | $ 10,000,000 | 50,000,000
Coverage net |  |  |  |  |  | $ 1,000,000,000.0
SCE | CPUC |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Requested increase rate amount | $ 214,000,000 | $ 505,000,000 |  |  |  |
Authorized recovery |  | $ 505,000,000 |  |  |  |
Collection period |  | 2 years |  |  |  |
SCE | CPUC | 2018 GRC |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Requested increase rate amount | $ 204,000,000 | $ 478,000,000 |  |  |  |
SCE | Forecast |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire insurance coverage |  |  | $ 1,000,000,000.0 |  |  |
Co-insurance |  |  | 80,000,000 |  |  |
Self insurance |  |  | 50,000,000 |  |  |
Coverage net |  |  | $ 870,000,000 |  |  |

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