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Loans and Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounts Receivable and Loans Textuals        
Card member loans $ 83,655 $ 81,854    
Loans segment information        
Less: Reserve for losses 2,232 2,134 $ 1,937 $ 1,706
Card Member loans, net 81,423 79,720    
Other loans, net 4,340 3,676    
Other loans, reserves 140 124    
Variable Interest Entity, Primary Beneficiary [Member]        
Accounts Receivable and Loans Textuals        
Card member loans 31,144 33,194    
Global Consumer Services Group [Member]        
Accounts Receivable and Loans Textuals        
Card member loans 69,810 69,458    
Global Commercial Services [Member]        
Accounts Receivable and Loans Textuals        
Card member loans $ 13,845 $ 12,396