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Commitments and Contingencies (Current Wildfire Insurance Coverage) (Details) - USD ($) | 1 Months Ended | 4 Months Ended | 11 Months Ended | 12 Months Ended | 13 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2019 | May 31, 2019 | May 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Jun. 30, 2020 | Mar. 31, 2019 | Feb. 28, 2019
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | $ 5,380,000,000 |  |  | $ 5,268,000,000 |
Southern California Edison |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Wildfire-specific insurance coverage |  |  |  |  | 1,000,000,000 | $ 300,000,000 |  |  |
Self-insured retention |  |  |  |  | 10,000,000 |  |  |  |
Net Regulatory Assets |  |  |  |  |  |  |  | 107,000,000 |
Regulatory assets |  |  |  |  | $ 5,380,000,000 |  |  | 5,268,000,000 |
Southern California Edison | Wildfire insurance costs |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  | $ 148,000,000 |
Southern California Edison | Forecast |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Wildfire-specific insurance coverage |  | $ 735,000,000 | $ 1,000,000,000 |  |  |  | $ 1,200,000,000 |  |
Self-insured retention |  | 35,000,000 | 10,000,000 |  |  |  | 50,000,000 |  |
Co-Insurance per wildfire occurrence |  | 15,000,000 | $ 15,000,000 |  |  |  | 115,000,000 |  |
Wildfire-specific insurance coverage, net |  | $ 685,000,000 |  |  |  |  | 1,000,000,000 |  |
Expected wildfire-specific insurance coverage |  |  |  |  |  |  | $ 10,000,000 |  |
Wildfire insurance expense |  |  |  | $ 399,000,000 |  |  |  |  |
Wildfire liability insurance recovery | Regulatory balancing accounts | Southern California Edison |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Net Regulatory Assets |  |  |  |  |  |  |  |  | $ 107,000,000
FERC | Subsequent event | Southern California Edison | Forecast |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Additional ROE | 6.00% |  |  |  |  |  |  |  |

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