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Summary of Significant Accounting Policies (Organization and Basis of Presentation) (Details) mi² in Thousands | 6 Months Ended
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Jun. 30, 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
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- Definition Supply Of Electricity Area Covered 1 + References No definition available. + Details
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Balance Type: | na
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- Details
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Data Type: | na
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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eix_ElectricUtilityMember
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Period Type: |