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Guarantees - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 6 Months Ended
May 31, 2009
Jun. 30, 2016
Dec. 31, 2015
Document Period End Date   Jun. 30, 2016  
Derivative Liability, Fair Value, Gross Asset   $ 4,143 $ 2,916
Standby Letters of Credit      
Guarantor Obligations, Maximum Exposure, Undiscounted   2,800 2,900
Mortgage Servicing Rights [Member]      
Loss Contingency Accrual, at Carrying Value   10 14
Visa Interest [Member]      
Derivative Liability, Fair Value, Gross Asset   $ 13 $ 6
Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member]      
Number Of Shares Sold To Selected Financial Institutions 3.2    
Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Liabilities [Member] | Visa Interest [Member]      
Number Of Shares Sold To Selected Financial Institutions 3.2