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Legal and Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2013
Mar. 31, 2019
Sep. 30, 2012
Loss Contingencies                
Amount in excess of amounts reserved       $ 56        
Number Of Putative Class Actions Filed           4    
Damages sought $ 40 $ 800   $ 280        
Apr percentage allegedly misleading               120.00%
Federal Lawsuits                
Loss Contingencies                
Number of merchants requesting exclusion     500          
Class Action Settlement                
Loss Contingencies                
Number of merchants requesting exclusion     8,000          
Escrow Deposit     $ 46          
Percentage Escrow Funds Returned Defendants       25.00%     25.00%  
Litigation Settlement Amount Awarded from Other party       $ 6,240        
Escrow Funds Returned to Defendants       700 $ 700      
Litigation Settlement Amount Awarded To Other Party, Escrow         5,340      
Litigation Settlement Amount Awarded To Other Party, Additional       $ 900 $ 900      
Class Action Settlement | Minimum [Member]                
Loss Contingencies                
Percentage Escrow Funds Returned Defendants       15.00%        
Class Action Settlement | Maximum [Member]                
Loss Contingencies                
Percentage Escrow Funds Returned Defendants       25.00%