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U.S. and Europe Retrospective Responsibility Plan - Additional Details (Details)
€ in Millions, $ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2016
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 21, 2016
EUR (€)
Class of Stock [Line Items]                
Omnibus loss sharing agreement percentage 66.6667%     66.6667% 66.6667%      
Litigation loss sharing agreement, obligation threshold | €               € 1,000
Limit of protection from VE territory covered losses               70.00%
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | €         € 20      
Recovery through conversion rate adjustment       $ 8        
Series B Preferred Stock                
Class of Stock [Line Items]                
Recovery through conversion rate adjustment       6   $ 35 $ 190  
Preferred stock, conversion rate 12.936 12.9550 13.952          
Series C Preferred Stock                
Class of Stock [Line Items]                
Recovery through conversion rate adjustment       2   21 1  
Preferred stock, conversion rate 13.884 13.888            
Right to Recover for Covered Losses                
Class of Stock [Line Items]                
Recovery through conversion rate adjustment       $ 8   56 $ 191  
MasterCard                
Class of Stock [Line Items]                
Omnibus loss sharing agreement percentage 33.3333%     33.3333% 33.3333%      
U.S. Covered Litigation | Interchange Multidistrict Litigation                
Class of Stock [Line Items]                
Provision for unsettled legal matters       $ 370   $ 600