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Legal & Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2013
Mar. 31, 2013
USD ($)
Sep. 30, 2012
USD ($)
Loss Contingencies          
Amount in excess of amounts reserved   $ 41      
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 requesting exclusion   460      
Class Action Settlement          
Loss Contingencies          
Number of merchants requesting exclusion   8,000      
Percentage of escrow funds returned to defendants   25.00%      
Escrow Deposit       $ 46