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Summary of Significant Accounting Policies (Inventory) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Southern California Edison |
Summary of Significant Accounting Policies [Line Items] |
Reclassification of Inventory | $ 100

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- Definition Reclassification of Inventory + References No definition available. + Details
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Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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