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Legal and Regulatory Proceedings (Details)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 17, 2018
USD ($)
Mar. 27, 2017
USD ($)
merchant
Mar. 31, 2020
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2013
class_action
Jun. 30, 2020
USD ($)
Aug. 03, 2012
Loss Contingencies              
Apr percentage allegedly misleading             120.00%
Number of putative class actions filed | class_action         4    
Damages sought     $ 280 $ 800      
Amount in excess of amounts reserved           $ 86  
Class Action Settlement              
Loss Contingencies              
Number of merchants requesting exclusion | merchant   8,000          
Escrow deposit   $ 46          
Total payment by all defendants $ 6,240            
Amount awarded to other party, escrow 5,340            
Amount awarded to other party, additional 900            
Escrow funds returned to defendants $ 700            
Class Action Settlement | Minimum              
Loss Contingencies              
Percentage escrow funds returned defendants 15.00%            
Class Action Settlement | Maximum              
Loss Contingencies              
Percentage escrow funds returned defendants 25.00%            
Federal Lawsuits              
Loss Contingencies              
Number of merchants requesting exclusion | merchant   500