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Loans and Accounts Receivable (Details 1) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable segment information        
Card Member receivables $ 55,893 $ 54,047    
Less: Reserve for losses 573 521 $ 467 $ 462
Card Member receivables, net 55,320 53,526    
Other receivables, net 2,907 3,209    
Accounts Receivable and Loans Textuals [Abstract]        
Other receivables, reserves 25 31    
Variable Interest Enterprise [Member]        
Accounts receivable segment information        
Card Member receivables 8,539 8,919    
Global Consumer Services Group [Member]        
Accounts receivable segment information        
Card Member receivables 21,455 20,946    
Global Commercial Services [Member]        
Accounts receivable segment information        
Card Member receivables $ 34,438 $ 33,101