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Income Taxes (Operating Loss and Tax Carryforward) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2015 to 2019 | $ 3 eix_OperatingLossCarryforwardsExpiringInYearsOneThroughFive
Loss Carryforwards, Expiring 2020 to 2033 | 1,213 eix_OperatingLossCarryforwardsExpiringAfterYearFive
Loss Carryforwards, No expiration date | 0 eix_OperatingLossCarryforwardsNotSubjectToExpiration
Loss Carryforwards | 1,216 us-gaap_OperatingLossCarryforwards
Credit Carryforward, Expiring 2015 to 2019 | 0 eix_TaxCreditCarryforwardExpiringInYearsOneThroughFive
Credit Carryforward, Expiring 2020 to 2033 | 405 eix_TaxCreditCarryforwardExpiringAfterYearFive
Credit Carryforward, No expiration date | 36 eix_TaxCreditCarryforwardNotSubjectToExpiration
Credit Carryforwards | 441 us-gaap_TaxCreditCarryforwardAmount
Southern California Edison |
Tax Credit Carryforward [Line Items] |
Loss Carryforwards, Expiring 2015 to 2019 | 14 eix_OperatingLossCarryforwardsExpiringInYearsOneThroughFive / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Loss Carryforwards, Expiring 2020 to 2033 | 132 eix_OperatingLossCarryforwardsExpiringAfterYearFive / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Loss Carryforwards | 146 us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Credit Carryforward, Expiring 2015 to 2019 | 0 eix_TaxCreditCarryforwardExpiringInYearsOneThroughFive / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Credit Carryforward, Expiring 2020 to 2033 | 39 eix_TaxCreditCarryforwardExpiringAfterYearFive / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Credit Carryforward, No expiration date | 20 eix_TaxCreditCarryforwardNotSubjectToExpiration / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Credit Carryforwards | $ 59 us-gaap_TaxCreditCarryforwardAmount / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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