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Income Taxes (Tax Rate Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Effective Tax Rate        
Income (loss) from continuing operations before income taxes $ (184) $ 307 $ 199 $ 593
Provision for income tax at federal statutory rate of 35% (64) 107 70 207
State tax, net of federal benefit (20) 8 (17) 14
Property-related (22) (10) (64) (19)
Uncertain tax positions 11 0 18 1
Other (7) (5) (11) (11)
Total income tax expense (benefit) from continuing operations (102) 100 (4) 192
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Effective tax rate   32.60%   32.40%
Southern California Edison
       
Effective Tax Rate        
Income (loss) from continuing operations before income taxes (166) 322 229 622
Provision for income tax at federal statutory rate of 35% (58) 113 80 218
State tax, net of federal benefit (23) 10 (9) 20
Property-related (22) (10) (64) (20)
Uncertain tax positions 11 (1) 17 0
Other (7) (4) (11) (10)
Total income tax expense (benefit) from continuing operations $ (99) $ 108 $ 13 $ 208
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Effective tax rate   33.50% 5.70% 33.40%