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Investments (Details) (ABCP [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
ABCP [Member]
      
Company's investment in ABCP      
Balance, beginning of year $ 84 $ 85 $ 65
Valuation adjustment     9
Cash receipts   (5)  
Foreign exchange and other (2) 4 11
Balance, end of year $ 82 $ 84 $ 85