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Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Jun. 30, 2020 | Feb. 28, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  | $ 6,088,000,000 | $ 5,380,000,000 |  |  |
SCE |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire insurance coverage |  |  | 1,000,000,000.0 | $ 300,000,000 |  |
Self insurance |  |  | 10,000,000 |  |  |
Wildfire insurance expense |  | 400,000,000 |  |  |  |
Regulatory assets |  | 6,088,000,000 | $ 5,380,000,000 |  |  |
SCE | Wildfire insurance costs |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory assets |  | $ 341,000,000 |  |  |  |
SCE | California Public Utilities Commission |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Requested rate amount | $ 478,000,000 |  |  |  |  |
SCE | Revenue subject to refund | Wildfire liability insurance recovery |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Net regulatory assets (liabilities) pertaining to balancing accounts |  |  |  |  |  | $ 107,000,000
SCE | Forecast |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Wildfire insurance coverage |  |  |  |  | $ 1,200,000,000 |
Co-insurance |  |  |  |  | 115,000,000 |
Self insurance |  |  |  |  | 50,000,000 |
Coverage net |  |  |  |  | $ 1,000,000,000.0 |

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