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Legal and Regulatory Proceedings (Details)
$ in Millions
12 Months Ended
May 28, 2019
USD ($)
Sep. 17, 2018
USD ($)
Mar. 27, 2017
USD ($)
merchant
Aug. 31, 2015
USD ($)
Dec. 31, 2013
class_action
Sep. 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           $ 83  
Class Action Settlement              
Loss Contingencies              
Escrow deposit     $ 46        
Number of merchants requesting exclusion | merchant     8,000        
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