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Commitments and Contingencies (Southern California Wildfires and Mudslides) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 28 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2020 USD ($) | Jul. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2018 USD ($) a structure fatality | Mar. 31, 2020 USD ($) | Jan. 31, 2019 claim | Jan. 31, 2018 structure fatality | Dec. 04, 2017 a structure fatality
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated losses |  |  | $ 4,568 | $ 4,568 |  | $ 4,568 |  |  |
San Onofre OII |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Derivative lawsuits | claim |  |  |  |  |  |  | 2 |  |
2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated losses |  |  | 4,500 | 4,500 |  | 4,500 |  |  |
Expected insurance recoveries |  |  | $ 1,700 |  |  | 1,700 |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
High fire risk service area, percent |  |  | 27.00% |  |  |  |  |  |
Estimated losses |  |  | $ 4,568 | 4,568 |  | 4,568 |  |  |
Wildfire-specific insurance coverage |  |  |  |  | $ 1,000 |  |  |  |
Self-insured retention |  |  | 10 |  |  |  |  |  |
Southern California Edison | CPUC |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase |  | $ 478 |  |  |  |  |  |  |
Southern California Edison | Thomas and Koenigstein Fires |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  |  |  |  |  | 280,000
Structures destroyed | structure |  |  |  |  |  |  |  |  | 1,343
Fatalities | fatality |  |  |  |  |  |  |  |  | 2
Southern California Edison | Thomas and Koenigstein Fires | CPUC |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Requested rate increase |  | $ 6 |  |  |  |  |  |  |
Southern California Edison | Woolsey Fire |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  | 100,000 |  |  |  |
Structures destroyed | structure |  |  |  |  | 1,643 |  |  |  |
Fatalities | fatality |  |  |  |  | 3 |  |  |  |
Structures damaged | structure |  |  |  |  | 364 |  |  |  |
Additional fatalities | fatality |  |  |  |  | 2 |  |  |  |
Wildfire-specific insurance coverage |  |  | 1,000 |  |  |  |  |  |
Self-insured retention |  |  | 10 |  |  |  |  |  |
Southern California Edison | Montecito Mudslides |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  |  |  |  |  |  |  | 135 |
Fatalities | fatality |  |  |  |  |  |  |  | 21 |
Structures damaged | structure |  |  |  |  |  |  |  | 324 |
Additional presumed fatalities | fatality |  |  |  |  |  |  |  | 2 |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimated losses |  |  | 4,500 | 4,500 |  | 4,500 |  |  |
Expected insurance recoveries |  |  | 1,652 | 1,710 |  | 1,652 |  |  |
Expected revenue from FERC customers |  |  | 113 | 149 |  | 113 |  |  |
Payments |  |  | 360 | $ 360 |  |  |  |  |
Accrued losses |  |  | 4,900 |  |  |  |  |  |
Insurance recoveries |  |  | $ 58 |  |  | $ 348 |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event | Subsequent event |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Insurance recoveries | $ 15 |  |  |  |  |  |  |  |

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