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Compensation and Benefit Plans (Supplemental Data on Stock-Based Compensation) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 35 [1] $ 30 [1] $ 35 [1]
Income tax benefits related to stock compensation expense 14 12 13
Excess tax benefits (expense) (6) [2] 12 [2] 7 [2]
Weighted average grant date fair value per option granted (dollars per share) $ 5.22 $ 5.61 $ 4.89
Fair value of options vested 17 18 18
Cash used to purchase shares to settle options 169 90 61
Cash from participants to exercise stock options 101 59 38
Value of options exercised 68 31 23
Tax benefits from options exercised 27 12 9
Employee Stock Option
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 18 [1] 14 [1] 14 [1]
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 7 [1] 5 [1] 8 [1]
Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 9 [1] 6 [1] 6 [1]
Weighted average grant date fair value per share granted (dollars per share) $ 43.17 $ 38.01 $ 32.12
Values of shares settled 7 6 0
Tax benefits realized from settlement of awards 3 3 0
Other Stock Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1 [1] 5 [1] 7 [1]
Performance Benefits Classified As Equity Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share granted (dollars per share) $ 51.43 $ 29.97 $ 32.25
Fair value of shares vested 4 4 4
Values of shares settled 4 0 0
Tax benefits realized from settlement of awards 2 0 0
Performance Shares Classified As Liability Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Values of shares settled 4 0 0
Tax benefits realized from settlement of awards 2 0 0
Southern California Edison
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 19 [1] 20 [1] 27 [1]
Income tax benefits related to stock compensation expense 8 8 11
Excess tax benefits (expense) (13) [2] 11 [2] 4 [2]
Weighted average grant date fair value per option granted (dollars per share) $ 5.22 $ 5.61 $ 4.87
Fair value of options vested 10 10 11
Cash used to purchase shares to settle options 96 46 27
Cash from participants to exercise stock options 59 28 18
Value of options exercised 37 18 9
Tax benefits from options exercised 15 7 4
Southern California Edison | Employee Stock Option
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 10 [1] 9 [1] 10 [1]
Southern California Edison | Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 4 [1] 3 [1] 6 [1]
Southern California Edison | Restricted Stock Units (RSUs)
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 5 [1] 4 [1] 5 [1]
Weighted average grant date fair value per share granted (dollars per share) $ 43.20 $ 38.07 $ 33.38
Values of shares settled 4 5 0
Tax benefits realized from settlement of awards 2 2 0
Southern California Edison | Other Stock Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 0 [1] 4 [1] 6 [1]
Southern California Edison | Performance Benefits Classified As Equity Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value per share granted (dollars per share) $ 51.48 $ 29.40 $ 32.19
Fair value of shares vested 3 2 3
Values of shares settled 2 0 0
Tax benefits realized from settlement of awards 1 0 0
Southern California Edison | Performance Shares Classified As Liability Awards
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Values of shares settled 2 0 0
Tax benefits realized from settlement of awards $ 1 $ 0 $ 0
[1] Reflected in "Operations and maintenance" on Edison International's and SCE's consolidated statements of income.
[2] Reflected in "Settlements of stock-based compensation, net" in the financing section of Edison International's and SCE's consolidated statements of cash flows.