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Guarantees and Contingent Liabilities - Company's Representation and Warranty Reserve (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Valuation And Qualifying Accounts [Abstract]    
Representation and Warranty Reserve, Beginning Balance $ 240 $ 160
Net realized losses (23) (25)
Additions to reserve 16 67
Representation and Warranty Reserve, Ending Balance $ 233 $ 202