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Accrued Litigation for Both Covered and Non-Covered Litigation (Detail)
$ in Millions
 3 Months Ended
Dec. 31, 2016
USD ($)
merchant
Dec. 31, 2015
USD ($)
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period $ 981 $ 1,024
Balance at end of period $ 994 1,012
U.K. Merchant Litigation    
Loss Contingencies [Line Items]    
Number of plaintiffs | merchant 100  
Loss Contingency Accrual [Roll Forward]    
Loss Contingency, Claims Settled, Number | merchant 4  
Threatened Litigation [Member] | U.K. Merchant Litigation    
Loss Contingencies [Line Items]    
Number of plaintiffs | merchant 30  
Unsettled [Member]    
Loss Contingency Accrual [Roll Forward]    
Provision for uncovered legal matters $ 15 0
Settled Litigation [Member]    
Loss Contingency Accrual [Roll Forward]    
Payments on litigation matters (88) (12)
VE Territory Covered Litigation [Member]    
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period 2  
Provision for uncovered legal matters 86 0
Balance at end of period 0  
VE Territory Covered Litigation [Member] | Settled Litigation [Member]    
Loss Contingency Accrual [Roll Forward]    
Payments on litigation matters (88)  
U.S. Covered Litigation [Member] [Member]    
Loss Contingency Accrual [Roll Forward]    
Balance at beginning of period 978 1,023
Balance at end of period 978 1,012
U.S. Covered Litigation [Member] [Member] | Settled Litigation [Member]    
Loss Contingency Accrual [Roll Forward]    
Payments on litigation matters $ 0 $ (11)