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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 40 us-gaap_AllocatedShareBasedCompensationExpense |  | $ 27 us-gaap_AllocatedShareBasedCompensationExpense |  | $ 35 us-gaap_AllocatedShareBasedCompensationExpense |
Income tax benefits related to stock compensation expense | 16 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  | 11 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  | 14 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Excess tax benefits (expense) | 15 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | [1] | 5 us-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 | 16 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [2] | 15 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | [2] | 18 us-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 | 16 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | [2] | 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | [2] | 7 us-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 | 7 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | [2] | 7 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | [2] | 9 us-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 | 1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = eix_OtherStockAwardsMember | [2] | 1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = eix_OtherStockAwardsMember | [2] | 1 us-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 | 20 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 17 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 19 us-gaap_AllocatedShareBasedCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Income tax benefits related to stock compensation expense | 8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 8 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Excess tax benefits (expense) | 20 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [1] | 2 us-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 | 8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 11 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 10 us-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 | 8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 2 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 4 us-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 | 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | 5 us-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 | $ 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = eix_OtherStockAwardsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | $ 0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = eix_OtherStockAwardsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | [2] | $ 0 us-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.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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