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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, 2020
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2013
Sep. 30, 2012
Loss Contingencies              
Amount in excess of amounts reserved $ 56            
Number Of Putative Class Actions Filed           4  
Damages sought $ 280 $ 800          
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        
Litigation Settlement Amount Awarded to Other Party, Total         $ 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%