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Planned Sale of Interest in Four Corners (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012
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Discontinued Operations and Disposal Groups [Abstract] |
Sales price | $ 294
Sales price, after adjustment | $ 279

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- Definition Sale price of the sale of ownership interest of a generating plant. + References No definition available. + Details
Name: | sce_SaleOfBusinessSalesPrice
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sale price, after an adjustment, of the sale of ownership interest of a generating plant. + References No definition available. + Details
Name: | sce_SaleOfBusinessSalesPriceAfterAdjustment
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration