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Summary of Significant Accounting Policies (Deferred Financing Costs) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Southern California Edison |  |  |
Amortization of deferred financing costs charged to interest expense | $ 32 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 32 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 29 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Edison International |  |  |
Amortization of deferred financing costs charged to interest expense | $ 36 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 33 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 30 us-gaap_AmortizationOfFinancingCosts / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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