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Card Member Receivables and Card Member Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounts Receivable [Abstract]        
Card Member receivables $ 26,319 $ 24,596    
Less: Reserve for losses 172 167 $ 157 $ 145
Card Member receivables, net 26,147 24,429    
Global Consumer Services Group [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 9,123 8,485    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 17,196 $ 16,111