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Commitments and Contingencies (Contingencies) (Details) a in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) a cases structure fatality | Dec. 31, 2017 USD ($) a cases structure fatality | Jan. 31, 2018 structure fatality
December 2017 Wildfires |  |  |
Loss Contingencies [Line Items] |  |  |
Acres burned | a | 280 | 280 |
Structures destroyed | structure | 1,063 | 1,063 |
Structures damaged | structure | 280 | 280 |
Fatalities | fatality | 2 | 2 |
Capital expenditures related to restoration of service | $ 35.0 |  |
Loss Contingency, Number of Plaintiffs | cases |  | 4 |
Lawsuits | cases | 6 | 6 |
Montecito Mudslides | Subsequent event |  |  |
Loss Contingencies [Line Items] |  |  |
Structures destroyed | structure |  |  | 135
Structures damaged | structure |  |  | 324
Fatalities | fatality |  |  | 21
Additional fatalities presumed | fatality |  |  | 2
SCE |  |  |
Loss Contingencies [Line Items] |  |  |
Wildfire insurance coverage | $ 1,000.0 | $ 1,000.0 |
Self insurance retention per wildfire occurrence | 10.0 | 10.0 |
Other general liability insurance coverage | 450.0 | 450.0 |
Threshold for wildfire claims | 300.0 | 300.0 |
The Utilities |  |  |
Loss Contingencies [Line Items] |  |  |
Funding commitment for GHG Reduction Program | $ 25.0 | 25.0 |
Funding obligation reduction |  | 12.5 |
San Onofre | SCE |  |  |
Loss Contingencies [Line Items] |  |  |
Proceeds received |  | 72.0 |
Arbitration with Mitsubishi Heavy Industries | San Onofre | SCE |  |  |
Loss Contingencies [Line Items] |  |  |
Proceeds received |  | $ 47.0 |

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