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Card Member Receivables and Card Member Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable [Abstract]        
Card Member receivables $ 24,596 $ 20,276    
Less: Reserve for losses 167 145 $ 110 $ 114
Card Member receivables, net 24,429 20,131    
Global Consumer Services Group [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 8,485 5,384    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 16,111 $ 14,892