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Summary of Significant Accounting Policies (Details) (Southern California Edison, Electric Utility) | 3 Months Ended
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Mar. 31, 2013 sqmi
Southern California Edison | Electric Utility |
Summary of Significant Accounting Policies [Line Items] |
Supply of electricity, area covered (square mile) | 50,000

X
- Details
Name: | eix_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the total area covered in supply of electricity. + References No definition available. + Details
Name: | eix_SupplyOfElectricityAreaCovered
Namespace Prefix: | eix_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration