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Commitments and Contingencies (Wildfires and Mudslides) (Details) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) a item individual | Oct. 31, 2019 a item individual | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 30, 2018 a item individual | Jan. 31, 2018 item individual | Dec. 04, 2017 a item individual
2019/2020 Wildfires |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Charge for wildfire-related claims | $ |  |  | $ 118 |  |  |  |
Expected insurance recoveries | $ |  |  | 75 |  |  |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expected revenue from FERC customers | $ |  |  | 91 |  |  |  |
Charge for wildfire-related claims | $ |  |  | 3,763 | $ 4,383 |  |  |
Expected insurance recoveries | $ |  |  | 666 |  |  |  |
Aggregate settlement payments | $ |  |  | $ 2,400 |  |  |  |
SCE |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
High fire risk service area, percent |  |  | 27.00% |  |  |  |
SCE | Saddle Ridge Fire |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Acres burned | a |  | 9,000 |  |  |  |  |
Structures destroyed | item |  | 19 |  |  |  |  |
Structures damaged | item |  | 88 |  |  |  |  |
Fatalities | individual |  | 1 |  |  |  |  |
Number of injured firefighters | individual |  | 8 |  |  |  |  |
SCE | Bobcat fire |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Acres burned | a | 116,000 |  |  |  |  |  |
Number of injured firefighters | individual | 6 |  |  |  |  |  |
Estimated fire suppression costs | $ | $ 80 |  |  |  |  |  |
SCE | Bobcat fire | Homes |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Structures destroyed | item | 87 |  |  |  |  |  |
Structures damaged | item | 28 |  |  |  |  |  |
SCE | Bobcat fire | Commercial property |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Structures destroyed | item | 1 |  |  |  |  |  |
SCE | Bobcat fire | Minor structures |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Structures destroyed | item | 83 |  |  |  |  |  |
Structures damaged | item | 19 |  |  |  |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expected revenue from FERC customers | $ |  |  | $ 91 |  |  |  |
Expected insurance recoveries | $ |  |  | 666 | $ 708 |  |  |
Expected FERC cumulative recoveries | $ |  |  | 233 |  |  |  |
SCE | December 2017 - Thomas and Koenigstein Wildfires |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expected insurance recoveries | $ |  |  | 0 |  |  |  |
Acres burned | a |  |  |  |  |  |  | 280,000
Structures destroyed | item |  |  |  |  |  |  | 1,343
Fatalities | individual |  |  |  |  |  |  | 2
SCE | November 2018 - Woolsey Wildfires |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Expected insurance recoveries | $ |  |  | $ 666 |  |  |  |
Acres burned | a |  |  |  |  | 100,000 |  |
Structures destroyed | item |  |  |  |  | 1,643 |  |
Structures damaged | item |  |  |  |  | 364 |  |
Fatalities | individual |  |  |  |  | 3 |  |
Additional fatalities | individual |  |  |  |  | 2 |  |
SCE | Montecito Mudslides |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Structures destroyed | item |  |  |  |  |  | 135 |
Structures damaged | item |  |  |  |  |  | 324 |
Fatalities | individual |  |  |  |  |  | 21 |
Additional fatalities presumed | individual |  |  |  |  |  | 2 |

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