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Related Party Transactions (Details) (Southern California Edison, EME Natural Gas Fired Projects, USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 MW
Southern California Edison | EME Natural Gas Fired Projects |  |
Related Party Transaction [Line Items] |  |
Term of power sales contract |  | 10 years
Output |  | 479
Expense for power purchased | $ 6 | $ 6

X
- Definition Long-term Contract for Purchase of Electric Power, Output of Contract + References No definition available. + Details
Name: | eix_LongTermContractForPurchaseOfElectricPowerOutputOfContract
Namespace Prefix: | eix_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-term Contract for Purchase of Electric Power, Term of Contract + References No definition available. + Details
Name: | eix_LongTermContractForPurchaseOfElectricPowerTermOfContract
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of purchased power charged against earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_UtilitiesOperatingExpensePurchasedPower
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration