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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Roll Forward]    
Goodwill, Beginning Balance $ 696 $ 696
Amount Allocated to Sale of Business (61) [1] 0
Goodwill, Ending Balance $ 635 $ 696
[1] See Note 3. Acquisitions and Divestitures.