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Commitments and Contingencies (Southern California Wildfires and Mudslides) (Details) a in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended | 31 Months Ended |  |  |
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Oct. 27, 2020 USD ($) | Oct. 19, 2020 USD ($) a structure injury | Oct. 31, 2019 a fatality structure injury | Jul. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Nov. 30, 2018 USD ($) a structure fatality | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jan. 31, 2019 claim | Jan. 31, 2018 structure fatality | Dec. 04, 2017 a fatality structure
San Onofre OII |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative lawsuits | claim |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated losses |  |  |  |  | $ 4,600,000,000 | $ 4,541,000,000 | $ 5,801,000,000 | $ 4,600,000,000 | $ 4,600,000,000 | $ 5,801,000,000 |  | $ 4,500,000,000 | $ 4,500,000,000 |  |  |
Charge for wildfire-related claims |  |  |  |  | 1,297,000,000 |  | 0 |  | 1,297,000,000 | 0 |  |  |  |  |  |
Expected revenue from FERC customers |  |  |  |  | 84,000,000 |  | 0 |  | 84,000,000 | 0 |  |  |  |  |  |
Net charge to earnings |  |  |  |  | 1,213,000,000 |  | 0 |  | 1,213,000,000 | 0 |  |  |  |  |  |
Total after-tax charge |  |  |  |  | 874,000,000 |  | 0 |  | 874,000,000 | 0 |  |  |  |  |  |
Total estimated liabilities |  |  |  |  | 5,800,000,000 |  |  | 5,800,000,000 | 5,800,000,000 |  |  |  |  |  |  |
Fixed payments to be made under executed settlement agreements3 |  |  |  |  | 1,192,000,000 |  |  | 1,192,000,000 | 1,192,000,000 |  |  |  |  |  |  |
Loss estimate balance |  |  |  |  | 4,609,000,000 |  |  | 4,609,000,000 | 4,609,000,000 |  |  |  |  |  |  |
Remaining expected insurance recoveries |  |  |  |  | 1,600,000,000 |  |  | 1,600,000,000 | 1,600,000,000 |  |  |  |  |  |  |
Expected insurance recoveries |  |  |  |  | 0 |  | 0 |  | 0 | 0 |  |  |  |  |  |
Cumulative expected recoveries |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |
Amounts paid |  |  |  |  |  |  |  |  | 37,000,000 |  |  |  |  |  |  |
Payments and settlements |  |  |  |  |  |  |  |  | $ 1,192,000,000 |  |  |  |  |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High fire risk service area, percent |  |  |  |  |  |  |  |  | 27.00% |  |  |  |  |  |  |
Wildfire-specific insurance coverage |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | 1,200,000,000 |  |  |  |
Self-insured retention |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  | 50,000,000 |  |  |  |
Southern California Edison | CPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  | $ 478,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Thomas and Koenigstein Fires |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 280
Structures destroyed | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,343
Fatalities | fatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Southern California Edison | Thomas and Koenigstein Fires | CPUC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Woolsey Fire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres burned | a |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Structures destroyed | structure |  |  |  |  |  |  |  |  |  |  | 1,643 |  |  |  |  |
Fatalities | fatality |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Structures damaged | structure |  |  |  |  |  |  |  |  |  |  | 364 |  |  |  |  |
Additional fatalities | fatality |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Wildfire-specific insurance coverage |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |  |  |  |  |
Self-insured retention |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |
Southern California Edison | Montecito Mudslides |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 |
Fatalities | fatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |
Structures damaged | structure |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324 |
Additional presumed fatalities | fatality |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Southern California Edison | Saddle Ridge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres burned | a |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |
Fatalities | fatality |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Structures damaged | structure |  |  | 88 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of injured firefighters | injury |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Bobcat fire | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres burned | a |  | 116 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of injured firefighters | injury |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fire suppression costs |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Bobcat fire | Subsequent event | Homes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  | 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures damaged | structure |  | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Bobcat fire | Subsequent event | Commercial property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | Bobcat fire | Subsequent event | Minor structures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures destroyed | structure |  | 83 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structures damaged | structure |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated losses |  |  |  |  | 4,600,000,000 | 4,541,000,000 | 5,801,000,000 | 4,600,000,000 | 4,600,000,000 | 5,801,000,000 |  | $ 4,500,000,000 | 4,500,000,000 |  |  |
Charge for wildfire-related claims |  |  |  |  | 1,297,000,000 |  | 0 |  | 1,297,000,000 | 0 |  |  | 6,200,000,000 |  |  |
Expected revenue from FERC customers |  |  |  |  | 84,000,000 |  | 0 |  | 84,000,000 | 0 |  |  |  |  |  |
Net charge to earnings |  |  |  |  | 1,213,000,000 |  | 0 |  | 1,213,000,000 | 0 |  |  |  |  |  |
Total after-tax charge |  |  |  |  | 874,000,000 |  | 0 |  | 874,000,000 | 0 |  |  |  |  |  |
Total estimated liabilities |  |  |  |  | 5,800,000,000 |  |  | 5,800,000,000 | 5,800,000,000 |  |  |  |  |  |  |
Fixed payments to be made under executed settlement agreements3 |  |  |  |  | 1,192,000,000 |  |  | 1,192,000,000 | 1,192,000,000 |  |  |  |  |  |  |
Loss estimate balance |  |  |  |  | 4,609,000,000 |  |  | 4,609,000,000 | 4,609,000,000 |  |  |  |  |  |  |
Remaining expected insurance recoveries |  |  |  |  | 1,637,000,000 | 1,710,000,000 |  | 1,637,000,000 | 1,637,000,000 |  |  |  |  |  |  |
Expected insurance recoveries |  |  |  |  | 0 |  | $ 0 |  | 0 | $ 0 |  |  |  |  |  |
Cumulative expected recoveries |  |  |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |
Amounts paid |  |  |  |  |  | 360,000,000 |  |  | 37,000,000 |  |  |  |  |  |  |
Payment agreement for each dollar of claim |  |  |  |  | 0.555 |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  | 73,000,000 |  |  |  |  |  |  |  |
Payments and settlements |  |  |  |  |  |  |  |  | 1,192,000,000 |  |  |  | 1,600,000,000 |  |  |
Insurance recoveries |  |  |  |  |  |  |  |  | 73,000,000 |  |  |  | $ 363,000,000 |  |  |
Estimated recoveries |  |  |  |  |  | $ 233,000,000 |  |  |  |  |  |  |  |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event | Short-term asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining expected insurance recoveries |  |  |  |  | 843,000,000 |  |  | 843,000,000 | 843,000,000 |  |  |  |  |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event | Other long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining expected insurance recoveries |  |  |  |  | $ 794,000,000 |  |  | $ 794,000,000 | $ 794,000,000 |  |  |  |  |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts paid | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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