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Summary of Significant Accounting Policies (Details) mi² in Thousands | 3 Months Ended
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Mar. 31, 2016 mi²
Southern California Edison | Electric Utility |
Summary of Significant Accounting Policies [Line Items] |
Supply of electricity, area covered (square mile) | 50

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- Definition These concepts are used to disclose significant accounting policies associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | eix_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Supply Of Electricity Area Covered 1 + References No definition available. + Details
Name: | eix_SupplyOfElectricityAreaCovered1
Namespace Prefix: | eix_
Data Type: | num:areaItemType
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: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eix_ElectricUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |