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U.S. and Europe Retrospective Responsibility Plans - Additional Information (Details)
€ in Millions, $ in Millions
 12 Months Ended
Jul. 29, 2022
USD ($)
shares
Sep. 30, 2023
EUR (€)
Sep. 30, 2022
shares
Jun. 21, 2016
EUR (€)
Class of Stock [Line Items]        
Omnibus loss sharing agreement percentage   66.6667%    
Litigation loss sharing agreement, obligation threshold | €       € 1,000
Limit of protection from VE territory covered losses (in percent)       70.00%
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | €   € 20    
Conversion adjustment denominator (in shares) 100      
Series A convertible participating preferred stock        
Class of Stock [Line Items]        
Preferred stock issued | $ $ 3,500      
Preferred stock, shares issued (in shares) 176,655      
Cash paid for fractional shares of series A preferred stock | $ $ 3      
Preferred Stock | Series A convertible participating preferred stock        
Class of Stock [Line Items]        
Preferred stock, shares issued (in shares) [1]     0  
MasterCard        
Class of Stock [Line Items]        
Omnibus loss sharing agreement percentage   33.3333%    
[1] Increase or decrease is less than one million shares.