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Commitments and Contingencies (Wildfires litigation) (Details) $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 20, 2021 plaintiff lawsuit | Jan. 31, 2021 $ / claim | Oct. 31, 2020 USD ($) $ / claim | Apr. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Jan. 31, 2019 claim
San Onofre OII |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | claim |  |  |  |  |  |  |  | 2
2019/2020 Wildfires |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | $ 118 |  |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  |  |  | 620 |  |  |
Charge for wildfire-related claims |  |  |  |  | 3,763 |  | $ 4,383 |
2017/2018 Wildfire/Mudslide Events | Settled Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | 1,800 |  |  |
2017/2018 Wildfire/Mudslide Events | Pending Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | $ 2,000 |  |  |
Thomas and Koenigstein Fires and Montecito Mudslides |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 37 |  |  |  |  |  |  |
Thomas and Koenigstein Fires, Class Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 4 |  |  |  |  |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events | Local Public Entity Settlements |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  |  |  |  | $ 360 |  |
SCE | 2017/2018 Wildfire/Mudslide Events | TKM Subrogation Settlement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  | $ 1,200 |  |  |  |  |
Payment agreement for each dollar of claim | $ / claim |  |  | 0.555 |  |  |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events | Individual Plaintiff Settlements |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of plaintiffs | item |  |  |  |  | 2,000 |  |  |
Payments |  |  |  |  | $ 200 |  | $ 300 |
SCE | Thomas and Koenigstein Fires and Montecito Mudslides |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 61 |  |  |  |  |  |  |
SCE | December 2017 - Thomas and Koenigstein Wildfires |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 269 |  |  |  |  |  |  |
Number of plaintiffs | plaintiff | 3,000 |  |  |  |  |  |  |
SCE | November 2018 - Woolsey Wildfires |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 313 |  |  |  |  |  |  |
Number of plaintiffs | lawsuit | 6,000 |  |  |  |  |  |  |
SCE | November 2018 - Woolsey Wildfires | Woolsey Subrogation Settlement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  |  | $ 2,200 |  |  |  |
Payment agreement for each dollar of claim | $ / claim |  | 0.67 |  |  |  |  |  |
SCE | Woolsey Fire, Class Action |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit | 2 |  |  |  |  |  |  |

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