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Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging, USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of loss recognized in OCI $ (32) $ (3) $ (32) $ (2)
Interest Income (Expense) Net
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain reclassified from OCI into net interest income 16 18 31 29
Other Noninterest Income
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of ineffectiveness recognized in other noninterest income   $ (2)   $ 1