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Commitments and Contingencies (Wildfire Insurance Coverage) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |
Wildfire insurance expense |  |  |  | $ 425 |
SCE |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Wildfire insurance coverage |  |  | $ 1,000 |  |
Self insurance |  |  | 50 |  |
Regulatory assets |  |  | 9,969 | 9,438 |
Co-insurance |  |  | 75 |  |
Coverage net |  |  | 875 |  |
Wildfire insurance expense |  |  |  | $ 450 |
Revenue requirement wildfire insurance expense | $ 460 |  |  |  |
Requested increase (decrease) revenue requirement |  | $ 214 |  |  |
SCE | Wildfire insurance costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Requested increase (decrease) revenue requirement |  | $ 204 |  |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  | 416 |  |
2017/2018 Wildfire/Mudslide Events | SCE |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Wildfire insurance coverage |  |  | 1,000 |  |
Self insurance |  |  | 10 |  |
Restoration capital expenditures |  |  |  |  | $ 60
Denied rate increase | 8 |  |  |  |
Potential impairment |  |  | 184 |  |
Expected FERC cumulative recoveries |  |  | 326 |  |
Regulatory assets |  |  | 155 |  |
2017/2018 Wildfire/Mudslide Events | SCE | Aggregate |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  | 7,900 |  |
Litigation settlement |  |  | 6,600 |  |
Insurance settlements and recoveries |  |  | 2,000 |  |
November 2018 Wildfires | SCE |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Wildfire insurance coverage |  |  | 1,000 |  |
Self insurance |  |  | $ 10 |  |
Thomas and Rye wildfires | SCE |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Denied rate increase | $ 6 |  |  |  |

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