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Income Taxes (Textual) (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] |  |  |
Loss Carryforwards | $ 1,216 us-gaap_OperatingLossCarryforwards |  |
Less valuation allowance | 29 us-gaap_DeferredTaxAssetsValuationAllowance | 1,380 us-gaap_DeferredTaxAssetsValuationAllowance |
Unrecognized tax benefits that would impact the effective tax rate | 503 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 653 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 96 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |
Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Loss Carryforwards | 146 us-gaap_OperatingLossCarryforwards / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |
Less valuation allowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 0 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Unrecognized tax benefits that would impact the effective tax rate | 370 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 374 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Disallowance of Repair Allowance Deduction |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | (133)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember | (89)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember | (115)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember
Disallowance of Repair Allowance Deduction | Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  | (231)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember
Tax Years 2007 to 2009 | Disallowance of Repair Allowance Deduction | Southern California Edison | IRS Examination |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | 16 us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember / eix_TaxPeriodAxis = eix_TaxYears2007to2009Member |  |
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment | 76 us-gaap_IncomeTaxExaminationEstimateOfPossibleLoss / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_TaxAdjustmentAxis = eix_DisallowanceofRepairAllowanceDeductionMember / eix_TaxPeriodAxis = eix_TaxYears2007to2009Member |  |
Stock Compensation Plan |  |  |
Income Tax Disclosure [Line Items] |  |  |
Loss Carryforwards | 42 us-gaap_OperatingLossCarryforwards / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember |  |
Stock Compensation Plan | Southern California Edison |  |  |
Income Tax Disclosure [Line Items] |  |  |
Loss Carryforwards | $ 22 us-gaap_OperatingLossCarryforwards / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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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 Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28511-109314 + Details
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