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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss)        
Amount of gain recognized in OCI $ (2) $ 16 $ (1) $ 25
Interest Income (Expense) Net
       
Derivative Instruments, Gain (Loss)        
Amount of gain reclassified from OCI into net interest income $ 10 $ 21 $ 31 $ 41