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Commitments and Contingencies (Wildfires litigation) (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2021 USD ($) | Jan. 31, 2021 $ / claim | Oct. 31, 2020 USD ($) $ / claim | Apr. 30, 2021 USD ($) | Mar. 31, 2022 USD ($) plaintiff | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  |  | $ 416 |  |  |
Expected revenue from FERC customers |  |  |  |  | 26 |  |  |
Total pre-tax charge |  |  |  |  | 390 |  |  |
Total after-tax charge |  |  |  |  | 281 |  |  |
Payments |  |  |  |  | 717 |  |  |
Charge for wildfire-related claims |  |  |  |  | 1,433 |  | $ 1,734 |
2017/2018 Wildfire/Mudslide Events | Settled Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | 137 |  |  |
2017/2018 Wildfire/Mudslide Events | Pending Litigation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | 1,300 |  |  |
2017/2018 Wildfire/Mudslide Events | Aggregate |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  |  |  | 6,400 |  |  |
2019/2020 Wildfires |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  |  |  |  | 229 |  |  |
Expected insurance recoveries |  |  |  |  | 171 |  |  |
SCE |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  | 9,969 |  | 9,438 |
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  | 155 |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events | SED Settlement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Charge for wildfire-related claims | $ 550 |  |  |  |  |  |  |
Third-party uninsured claims cost recovery waiver | 375 |  |  |  | 375 |  |  |
Fine to State | 110 |  |  |  |  |  |  |
Shareholder-funded safety measures costs | $ 65 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Payments |  |  |  |  | $ 700 |  | $ 1,700 | $ 300
Number of plaintiffs | plaintiff |  |  |  |  | 7,000 |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events | Aggregate |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  |  | $ 7,900 |  |  |
SCE | November 2018 Wildfires | Woolsey Subrogation Settlement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments |  |  |  | $ 2,200 |  |  |  |
Payment agreement for each dollar of claim | $ / claim |  | 0.67 |  |  |  |  |  |

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