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Commitments and Contingencies (Wildfire Insurance) (Details) - SCE $ in Millions | Dec. 31, 2016 USD ($)
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Loss Contingencies [Line Items] |
Threshold for wildfire claims | $ 1,000
Self insurance retention per wildfire occurrence | $ 10

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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 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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