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Commitments and Contingencies (Southern California Wildfires and Mudslides) (Details) a in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Nov. 30, 2018 USD ($) a structure fatality | Jan. 31, 2019 claims | Sep. 30, 2018 claims | Jan. 01, 2018 structure fatality | Dec. 31, 2017 a structure fatality
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Wildfire-related claims | $ 4,669,000,000 | $ 4,669,000,000 |  |  |  |  |
2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Derivative lawsuits | claims |  |  |  |  | 2 |  |
San Onofre OII |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Derivative lawsuits | claims |  |  |  | 2 |  |  |
Southern California Edison |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
High fire risk service area, percent | 35.00% |  |  |  |  |  |
Wildfire-related claims | $ 4,669,000,000 | 4,669,000,000 |  |  |  |  |
Wildfire-specific insurance coverage |  | 1,000,000,000 | $ 300,000,000 |  |  |  |
Self-insured retention |  | 10,000,000 |  |  |  |  |
Other general liability insurance coverage |  | 450,000,000 |  |  |  |  |
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 | Woolsey Fire |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Acres burned | a |  |  | 100 |  |  |  |
Structures destroyed | structure |  |  | 1,643 |  |  |  |
Fatalities | fatality |  |  | 3 |  |  |  |
Structures damaged | structure |  |  | 364 |  |  |  |
Wildfire-specific insurance coverage |  | 1,000,000,000 |  |  |  |  |
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 | 2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Wildfire-related claims | 4,700,000,000 | 4,700,000,000 |  |  |  |  |
Expected insurance recoveries | 2,000,000,000 | 2,000,000,000 |  |  |  |  |
Expected revenue from FERC customers | $ 135,000,000 | 135,000,000 |  |  |  |  |
Total after-tax charge |  | $ 1,800,000,000 |  |  |  |  |

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