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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Goodwill [Roll Forward]    
Goodwill $ 696 $ 758
Amount Allocated to Sale of Business Unit 0 [1] (61) [1]
Other 0 (1)
Goodwill $ 696 $ 696
[1] See Note 3 - Acquisitions and Divestitures.