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Guarantees and Contingent Liabilities - Company's Representation and Warranty Reserve (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Valuation And Qualifying Accounts [Abstract]        
Representation and Warranty Reserve, Beginning Balance $ 75 $ 233 $ 83 $ 240
Net realized losses (2) (16) (12) (39)
Change in reserve (4) (27) (2) (11)
Representation and Warranty Reserve, Ending Balance $ 69 $ 190 $ 69 $ 190