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Legal & Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2013
Mar. 31, 2013
USD ($)
Sep. 30, 2012
USD ($)
Loss Contingencies          
Percentage of funds returned to defendants   25.00%      
Class Settlement Escrow       $ 46  
Amount in excess of amounts reserved   $ 43      
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          
Number of merchants   460      
Merchants requesting exclusion from class settlement          
Loss Contingencies          
Number of merchants   8,000