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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
affiliate
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
affiliate
Sep. 30, 2019
USD ($)
Jun. 30, 2020
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]            
Number of affiliates | affiliate 16   16      
Equity investments            
Related Party Transaction [Line Items]            
Amounts due from unconsolidated merchant alliances $ 36   $ 36     $ 35
Corporate joint venture | Banc of America Merchant Services            
Related Party Transaction [Line Items]            
Percentage of interest in joint venture         51.00%  
Related Party Fees | Equity investments            
Related Party Transaction [Line Items]            
Processing, administrative, and other fees 62 $ 40 174 $ 58    
Merchant Alliances | Related Party Fees | Equity investments            
Related Party Transaction [Line Items]            
Processing, administrative, and other fees 47 31 134 31    
Lending Solutions Business and Investment Services Business | Related Party Fees | Affiliated entities            
Related Party Transaction [Line Items]            
Processing, administrative, and other fees $ 16 $ 9 $ 43 $ 27