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Commitments and Contingencies (Wildfire Insurance Coverage) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jul. 31, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
SCE |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Requested increase (decrease) in revenue requirement |  | $ 214 |  | $ 505 |  |  |  |  |
Regulatory assets |  | 8,434 |  |  | $ 8,939 |  | $ 8,939 |  | $ 8,434
Wildfire insurance coverage |  |  |  |  |  |  | 1,000 |  |
Co-insurance |  |  |  |  | 75 |  | 75 |  |
Self insurance |  |  |  |  |  |  | 50 |  |
Coverage net |  |  |  |  |  |  | 875 |  |
Wildfire insurance expense |  |  |  |  |  |  | 425 |  |
Approved regulatory increase (decrease) |  |  | $ 505 |  |  |  |  |  |
Revenue recovery period |  |  |  | 2 years |  |  |  |  |
SCE | Wildfire insurance costs |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Requested increase (decrease) in revenue requirement |  | 204 |  | $ 478 |  |  |  |  |
Wildfire insurance expense | $ 460 |  |  |  |  |  |  |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  |  | 1,265 | $ 1,297 | 1,265 | $ 1,297 |
2017/2018 Wildfire/Mudslide Events | SCE |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Expected insurance recoveries |  | $ 708 |  |  |  |  |  |  | 708
Insurance settlements and recoveries |  |  |  |  |  |  | 708 |  |
Restoration capital expenditures |  |  |  | $ 60 |  |  |  |  |
Denied rate increase | 8 |  |  |  |  |  |  |  |
Potential impairment |  |  |  |  |  |  | 187 |  |
Expected FERC cumulative recoveries |  |  |  |  | 300 |  | 300 |  |
Regulatory assets |  |  |  |  | $ 162 |  | 162 |  |
Wildfire insurance coverage |  |  |  |  |  |  | 1,000 |  |
Self insurance |  |  |  |  |  |  | 10 |  |
2017/2018 Wildfire/Mudslide Events | SCE | Aggregate |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Increase in accrued estimated losses to reflect best estimate |  |  |  |  |  |  | 7,500 |  |
Litigation settlement |  |  |  |  |  |  | 5,300 |  |
Insurance settlements and recoveries |  |  |  |  |  |  | 2,000 |  |
November 2018 - Woolsey Wildfires |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  | $ 2,212
November 2018 - Woolsey 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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