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Commitments and Contingencies (Wildfire Insurance) (Details) - Southern California Edison | Mar. 31, 2017 USD ($)
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Schedule Of Commitments And Contingencies [Line Items] |
Threshold for wildfire claims (new lines for additional coverage) | $ 1,000,000,000
Self-insured retention per wildfire occurrence | $ 10,000,000

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- Definition This element represents the increase in self insurance retention per wildfire occurrence. + References No definition available. + Details
Name: | eix_IncreaseInSelfInsuranceRetentionPerWildfireOccurrence
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Schedule Of Commitments And Contingencies [Line Items] + References No definition available. + Details
Name: | eix_ScheduleOfCommitmentsAndContingenciesLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Wildfire Threshold For Additional Coverage + References No definition available. + Details
Name: | eix_WildfireThresholdForAdditionalCoverage
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |