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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
Mar. 31, 2021
USD ($)
Sep. 30, 2020
class_action
Apr. 07, 2020
class_action
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           $ 58      
Shareholder Litigation, Lee Christakis                  
Loss Contingencies                  
Loss Contingency, Pending Claims, Number | class_action               2  
Shareholder Derivative Lawsuit                  
Loss Contingencies                  
Loss Contingency, Pending Claims, Number | class_action             4    
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              
Percentage escrow funds returned defendants     25.00%            
Federal Lawsuits                  
Loss Contingencies                  
Number of merchants requesting exclusion | merchant     500