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Legal & Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2013
Mar. 31, 2018
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2012
Mar. 31, 2012
USD ($)
Loss Contingencies            
Amount in excess of amounts reserved     $ 22      
APR Percentage Allegedly Misleading         120.00%  
Number Of Putative Class Actions Filed   4        
Damages Claimed By Plaintiff       $ 800   $ 40
Federal Lawsuits            
Loss Contingencies            
Number of merchants requesting exclusion 500          
Class Action Settlement            
Loss Contingencies            
Number of merchants requesting exclusion 8,000          
Percentage of escrow funds returned to defendants 25.00%          
Escrow Deposit $ 46