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Summary of Significant Accounting Policies (Energy Credits and Allowances) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Other Current Assets [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Greenhouse Gas Allowances | $ 135 | $ 41
Other Current Liabilities [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Greenhouse Gas Emission Obligations | $ 102 | $ 0

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- Definition Greenhouse Gas Allowances + 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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- Definition Greenhouse Gas Emission Obligations + References No definition available. + Details
Name: | eix_GreenhouseGasEmissionObligations
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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