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U.S. and Europe Retrospective Responsibility Plan U.S. and Europe Retrospective Responsibility Plan Additional Details (Details)
€ in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Jun. 21, 2016
EUR (€)
Jun. 21, 2016
USD ($)
Class of Stock [Line Items]            
Loss Contingency, Litigation Loss Sharing Agreement, Obligation Threshold | €         € 1,000  
Limit Of Protection From VE Territory Covered Losses         70.00% 70.00%
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | €     € 20      
Right to recover for covered losses $ 52 $ 34   $ 52   $ 25
Series B Preferred Stock            
Class of Stock [Line Items]            
Recovery through conversion rate adjustment       190    
Preferred stock, conversion rate 13.0770 [1] 13.952        
Series C Preferred Stock            
Class of Stock [Line Items]            
Recovery through conversion rate adjustment       1    
Preferred stock, conversion rate 13.9480 13.952        
Right to Recover for Covered Losses            
Class of Stock [Line Items]            
Recovery through conversion rate adjustment       $ 191    
MasterCard            
Class of Stock [Line Items]            
Omnibus loss sharing agreement percentage 33.3333%     33.3333%    
Visa            
Class of Stock [Line Items]            
Omnibus loss sharing agreement percentage 66.6667%     66.6667%    
[1] The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.