XML 30 R62.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Other Investments (Textual) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Other Investments [Line Items] |  |  |
Proceeds from sale of securities | $ 435,000,000 | $ 602,000,000 |
Southern California Edison |  |  |
Other Investments [Line Items] |  |  |
Contributions received for decommissioning trusts | 23,000,000 |  |
Period of reviewing contributions from decommissioning trusts (in years) | 3 years |  |
Expected annual trust contributions approved by C.P.U.C subsequent to approved decommissioning studies | 41,000,000 |  |
Proceeds from sale of securities | 435,000,000 | 602,000,000 |
Unrealized holding gains, net of losses | $ 1,700,000,000 |  | $ 1,600,000,000

X
- Definition Amount of contributions from customers into the decommissioning trusts. + References No definition available. + Details
Name: | eix_DecommissioningTrustContributionsReceived
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Expected Annual Trust Contributions Approved by C.P.U.C Subsequent to Approved Decommissioning Studies + References No definition available. + Details
Name: | eix_ExpectedAnnualTrustContributionsApprovedByCPUCSubsequentToApprovedDecommissioningStudies
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The period of reviewing and revising contributions from decommissioning trusts. + References No definition available. + Details
Name: | eix_PeriodOfReviewingAndRevisingContributionsFromDecommissioningTrusts
Namespace Prefix: | eix_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The cash inflow from the sale of assets held in a decommissioning trust fund. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_ProceedsFromDecommissioningFund
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration