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Investments - Company's Investment in ABCP (Detail) (ABCP [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
ABCP [Member]
      
Schedule of Equity Method Investments [Line Items]      
Balance, beginning of year $ 82 $ 84 $ 85
Valuation adjustment 15    
Cash receipts (9)   (5)
Foreign exchange and other 2 (2) 4
Balance, end of year $ 90 $ 82 $ 84