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Variable Interest Entities and Unconsolidated Investments (Income from Unconsolidated Investements 10-Q) (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
(Income) from unconsolidated investments in power plants $ (8) $ (5) $ (16) $ (14)
Greenfield [Member]
       
(Income) from unconsolidated investments in power plants (5) (2) (9) (8)
Whitby [Member]
       
(Income) from unconsolidated investments in power plants $ (3) $ (3) $ (7) $ (6)