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Income Taxes (Effective 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 $ (127) $ (156) $ (211) $ (290)
Provision (benefit) for income tax at federal statutory rate of 35% (45) (54) (74) (101)
Increase (decrease) in income tax from        
State tax - net of federal benefit (8) (5) (15) (18)
Change in valuation allowance 48 0 105 0
Production tax credits, net (21) (17) (42) (36)
Taxes on income allocated to noncontrolling interests (3) (5) (6) (4)
Other 4 0 4 2
Provision (benefit) for income taxes from continuing operations (25) (81) (28) (157)
Effective tax rate (as a percent) 20.00% 52.00% 13.00% 54.00%
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%
Midwest Generation LLC
       
Effective Tax Rate        
Income (loss) from continuing operations before income taxes (73) (69) (147) (83)
Provision (benefit) for income tax at federal statutory rate of 35% (25) (24) (51) (29)
Increase (decrease) in income tax from        
State tax - net of federal benefit (4) (3) (8) (4)
Change in valuation allowance 30 0 60 0
Other 0 0 0 1
Provision (benefit) for income taxes from continuing operations $ 1 $ (27) $ 1 $ (32)
Effective tax rate (as a percent)   39.00%   39.00%
Federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%