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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits |  |  |  |  |  |
Balance at January 1, | $ 815 us-gaap_UnrecognizedTaxBenefits |  | $ 812 us-gaap_UnrecognizedTaxBenefits |  | $ 631 us-gaap_UnrecognizedTaxBenefits |
Tax positions taken during the current year, Increases | 65 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  | 19 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  | 33 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Tax positions taken during a prior year, Increases | 1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 43 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  | 177 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Tax positions taken during a prior year, Decreases | (143)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | [1] | (109)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | [1] | (11)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | [1]
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME | 0 eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation | [2] | 50 eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation | [2] | (18)eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation | [2]
Tax positions taken during a prior year, Decreases for settlements during the period | (162)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | [3] | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | [3] | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | [3]
Balance at December 31, | 576 us-gaap_UnrecognizedTaxBenefits |  | 815 us-gaap_UnrecognizedTaxBenefits |  | 812 us-gaap_UnrecognizedTaxBenefits |
Southern California Edison |  |  |  |  |  |
Reconciliation of Unrecognized Tax Benefits |  |  |  |  |  |
Balance at January 1, | 532 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 571 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 373 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Tax positions taken during the current year, Increases | 57 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 22 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 35 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Tax positions taken during a prior year, Increases | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 45 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 169 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Tax positions taken during a prior year, Decreases | (93)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | (106)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | (6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1]
Tax positions taken during a prior year: Increases (decreases) - deconsolidation of EME | 0 eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 0 eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 0 eix_UnrecognizedTaxBenefitsIncreasesDecreasesFromDeconsolidation / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2]
Tax positions taken during a prior year, Decreases for settlements during the period | (55)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3] | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [3]
Balance at December 31, | $ 441 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | $ 532 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | $ 571 us-gaap_UnrecognizedTaxBenefits / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
[1] | Decreases in prior year tax positions relate primarily to re-measurement of uncertain tax positions in connection with the settlement of the 2003 – 2006 IRS audit.
[2] | Unrecognized tax benefits of EME have been deconsolidated as a result of the bankruptcy filing by EME, except for tax liabilities for which Edison International and EME are jointly liable under the Internal Revenue Code and applicable state statutes. See Note 15 for further information. During 2013, Edison International increased the amount of unrecognized tax benefits related to the taxable gain on sale of EME’s international assets by approximately $50 million as a result of unfavorable developments during the fourth quarter of 2013.
[3] | In the fourth quarter of 2014, Edison International has settled all open tax positions with the IRS for taxable year 2003 through 2006. Edison International has previously made cash deposits which are sufficient to settle all outstanding liabilities for this audit cycle. Total liabilities included tax reserves, previously settled issues and the associated interest and penalties.

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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