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Income Taxes (Interest and Penalties Related to Income Taxes) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Line Items] |  |  |
Accrued interest and penalties | $ 338 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | $ 406 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |
Net after-tax interest and penalties tax benefit (expense) | 41 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (3)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | (10)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Accrued interest and penalties | 64 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 88 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net after-tax interest and penalties tax benefit (expense) | $ 16 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ 2 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | $ (11)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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