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Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss)    
Amount of gain recognized in OCI $ 1 $ 9
Interest Income (Expense) Net
   
Derivative Instruments, Gain (Loss)    
Amount of gain reclassified from OCI into net interest income $ 21 $ 20