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Income Taxes (Tax Rate Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Effective Tax Rate        
Income (loss) from continuing operations before income taxes $ 665 $ 610 $ 863 $ 1,204
Provision for income tax at federal statutory rate of 35% 233 214 302 421
State tax, net of federal benefit 22 46 5 60
Property-related (57) (20) (121) (39)
Uncertain tax positions (5) 1 13 2
Other (16) (13) (26) (23)
Total income tax expense (benefit) from continuing operations 177 228 173 421
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Effective tax rate 26.60% 37.40% 20.00% 35.00%
Southern California Edison
       
Effective Tax Rate        
Income (loss) from continuing operations before income taxes 685 564 913 1,186
Provision for income tax at federal statutory rate of 35% 240 197 319 415
State tax, net of federal benefit 21 10 12 30
Property-related (57) (19) (121) (39)
Uncertain tax positions (6) 1 11 1
Other (15) (13) (25) (23)
Total income tax expense (benefit) from continuing operations $ 183 $ 176 $ 196 $ 384
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Effective tax rate 26.70% 31.20% 21.50% 32.40%