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Income Taxes (Effective Tax Rate Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Tax Rate                      
Income (loss) from continuing operations before income taxes                 $ (637) $ (888) $ 65
Provision (benefit) for income tax at federal statutory rate of 35%                 (223) (311) 23
Increase (decrease) in income tax from                      
State tax - net of federal benefit                 11 [1] (56) [1] 16 [1]
Change in valuation allowance                 438 0 0
Production tax credits, net                 (68) (66) (61)
Qualified production deduction                 0 (6) 15
Deferred tax adjustments                 0 (8) 10
Resolution of 1986-2002 state tax issues                 0 0 (16)
Taxes on income allocated to noncontrolling interests                 (4) 0 1
Other                 6 6 (4)
Provision (benefit) for income taxes from continuing operations                 160 (441) (16)
Effective tax rate (as a percent)                   50.00%  
Federal statutory rate (as a percent)                 35.00% 35.00% 35.00%
State tax expense (benefit)                 0 (44) 9
Edison International
                     
Increase (decrease) in income tax from                      
State tax expense (benefit)                 3 6 7
Midwest Generation LLC
                     
Effective Tax Rate                      
Income (loss) from continuing operations before income taxes                 (1,526) (442) 357
Provision (benefit) for income tax at federal statutory rate of 35%                 (534) (155) 125
Increase (decrease) in income tax from                      
State tax - net of federal benefit                 (52) (19) 14
Change in valuation allowance                 521 0 0
Qualified production deduction                 0 0 (7)
Deferred tax adjustments                 0 0 9
Other                 3 2 1
Provision (benefit) for income taxes from continuing operations (23) (7) (27) (5) (231) 38 (11) 32 (62) (172) 142
Effective tax rate (as a percent)                 4.00% 39.00% 40.00%
Federal statutory rate (as a percent)                 35.00% 35.00% 35.00%
State tax expense (benefit)                 $ 0 $ 12 $ 24
[1] Excludes state tax settlement in 2010.