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Compensation and Benefit Plans (Expense and Tax Benefits of Stock Based Compensation) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 40us-gaap_AllocatedShareBasedCompensationExpense $ 27us-gaap_AllocatedShareBasedCompensationExpense $ 35us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefits related to stock compensation expense 16us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 11us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 14us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Excess tax benefits (expense) 15us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities [1] 5us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities [1] (6)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities [1]
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 16us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [2] 15us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [2] 18us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 [2]
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 16us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2] 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2] 7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [2] 7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [2] 9us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [2]
Other      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember		 [2] 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember		 [2] 1us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember		 [2]
Southern California Edison      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 20us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 17us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 19us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Income tax benefits related to stock compensation expense 8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 7us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember
Excess tax benefits (expense) 20us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [1] 2us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [1] (13)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [1]
Southern California Edison | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 11us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 10us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2]
Southern California Edison | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2]
Southern California Edison | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] 5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2]
Southern California Edison | Other      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2] $ 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= eix_OtherStockAwardsMember
/ dei_LegalEntityAxis
= eix_SouthernCaliforniaEdisonCompanyMember		 [2]
[1] Reflected in "Settlements of stock-based compensation, net" in the financing section of Edison International's and SCE's consolidated statements of cash flows and in "Common stock" in Edison International's consolidated balance sheets and "Additional paid-in capital" in SCE's consolidated balance sheets.
[2] Reflected in "Operation and maintenance" on Edison International's and SCE's consolidated statements of income.