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Commitments and Contingencies (Contingencies) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 30, 2018 USD ($) a structure fatality | Dec. 31, 2019 USD ($) | Jan. 31, 2019 claim | Jan. 01, 2018 structure fatality | Dec. 04, 2017 a structure fatality
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  | $ 4,568,000,000 | $ 4,669,000,000 | $ 4,568,000,000 | $ 4,669,000,000 |  | $ 4,568,000,000 |  |  |
San Onofre OII |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Lawsuits | claim |  |  |  |  |  |  |  | 2 |  |
2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  | 4,541,000,000 | 4,669,000,000 | 4,541,000,000 | 4,669,000,000 |  | 4,541,000,000 |  |  |
Accrued losses |  |  |  | 232,000,000 |  |  |  |  |  |
Payments |  |  |  | $ 360,000,000 |  |  |  |  |  |
SCE |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
High fire risk service area, percent |  |  |  | 27.00% |  |  |  |  |  |
Charge for wildfire-related claims |  | 4,568,000,000 | 4,669,000,000 | $ 4,568,000,000 | 4,669,000,000 |  | 4,568,000,000 |  |  |
Wildfire insurance coverage |  |  |  |  | 1,000,000,000.0 | $ 300,000,000 |  |  |  |
Self insurance |  |  |  |  | 10,000,000 |  |  |  |  |
SCE | California Public Utilities Commission |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate amount | $ 478,000,000 |  |  |  |  |  |  |  |  |
SCE | December 2017 Wildfires |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  |  |  |  |  |  | 280,000
Structures destroyed | structure |  |  |  |  |  |  |  |  |  | 1,343
Fatalities | fatality |  |  |  |  |  |  |  |  |  | 2
SCE | December 2017 Wildfires | California Public Utilities Commission |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Requested rate amount | $ 6,000,000 |  |  |  |  |  |  |  |  |
SCE | November 2018 Wildfires |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  |  | 100,000 |  |  |  |
Structures destroyed | structure |  |  |  |  |  | 1,643 |  |  |  |
Fatalities | fatality |  |  |  |  |  | 3 |  |  |  |
Structures damaged | structure |  |  |  |  |  | 364 |  |  |  |
Additional fatalities | fatality |  |  |  |  |  | 2 |  |  |  |
Wildfire insurance coverage |  |  |  |  | 1,000,000,000.0 |  |  |  |  |
Self insurance |  |  |  |  | 10,000,000 |  |  |  |  |
SCE | Montecito Mudslides |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Fatalities | fatality |  |  |  |  |  |  |  |  | 21 |
Structures damaged |  |  |  |  |  | 135 |  |  | 324 |
Additional fatalities presumed | fatality |  |  |  |  |  |  |  |  | 2 |
SCE | Saddle Ridge Fire |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Self-insured retention expenses |  |  |  | 23,000,000 |  |  |  |  |  |
Self-insured retention expenses after tax |  |  |  | 17,000,000 |  |  |  |  |  |
SCE | 2017/2018 Wildfire/Mudslide Events |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Charge for wildfire-related claims |  | 4,500,000,000 | 4,700,000,000 | 4,500,000,000 | 4,700,000,000 |  | 4,500,000,000 |  |  |
Expected insurance recoveries |  | 1,710,000,000 | 2,000,000,000 | 1,710,000,000 | 2,000,000,000 |  | 1,710,000,000 |  |  |
Expected revenue from FERC customers |  | 149,000,000 |  | 149,000,000 |  |  | 149,000,000 |  |  |
Accrued losses |  | 232,000,000 | $ 2,500,000,000 | 232,000,000 | $ 4,669,000,000 |  | $ 4,900,000,000 |  |  |
Payments |  | $ 360,000,000 |  | 360,000,000 |  |  |  |  |  |
Settlements and recoveries |  |  |  | $ 290,000,000 |  |  |  |  |  |

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