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Commitments and Contingencies (Nuclear Insurance) (Details) - Insurance Claims | 12 Months Ended
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Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |
Federal loss limit, bodily injury and property damage from nuclear incident | $ 13,400,000,000
SCE and other owners of San Onofre and Palo Verde | San Onofre and Palo Verde |
Loss Contingencies [Line Items] |
Maximum private primary insurance | 450,000,000
ANI Facility Form coverage aggregate limit | 450,000,000
Minimum federal requirement of nuclear property insurance | 1,060,000,000
SCE |
Loss Contingencies [Line Items] |
Maximum assessment per each nuclear incident | 255,000,000
Maximum yearly assessment per nuclear incident | 38,000,000
Limit on assessment of retrospective premium adjustments, per year, approximate | $ 52,000,000

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- Definition The approximate maximum yearly retrospective premium adjustments that could be assessed against the entity. + References No definition available. + Details
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- Definition The maximum amount of deferred insurance premium based on each nuclear incident occurring. + References No definition available. + Details
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