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Derivative Financial Instruments - Gains and Losses on Derivative Instruments Designated and Qualifying As Hedging Instruments in Cash Flow Hedges (Detail) (Interest rate contracts [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) $ 14 $ (205) $ 4 $ (219)
Other Income [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Loss Reclassified from AOCI into Income (Effective Portion) (4) (4) (12) (9)
Loss Recognized in Income on the Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)   $ (6)   $ (7)