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Legal and Regulatory Proceedings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2008
Dec. 31, 2012
Legal And Regulatory Proceedings      
Number of alleging violations of ERISA that were dismissed   2  
Merchants requesting exclusion from class settlement 7,900    
Percentage of funds returned to defendants 25.00%    
Merchants filing separate federal lawsuits 460    
Merchant filing separate state lawsuit 1    
Class Settlement Escrow     $ 46
Non Class Action Escrow     4
Amount in excess of amounts reserved $ 104