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Legal and Regulatory Proceedings - Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2013
Mar. 31, 2013
USD ($)
Sep. 30, 2012
USD ($)
Loss Contingencies [Line Items]        
Percentage of funds returned to defendants 25.00%      
Class Settlement Escrow     $ 46  
Amount in excess of amounts reserved $ 38      
Litigation Settlement Amount $ 6      
APR Percentage Allegedly Misleading       120.00%
Number Of Putative Class Actions Filed   4    
Damages Claimed By Plaintiff       $ 70
Federal Lawsuits        
Loss Contingencies [Line Items]        
Number of merchants 460      
Merchants requesting exclusion from class settlement        
Loss Contingencies [Line Items]        
Number of merchants 8,000