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Card Member Receivables and Card Member Loans (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounts Receivable [Abstract]        
Card Member receivables $ 26,007 $ 24,596    
Less: Reserve for losses 175 167 $ 179 $ 145
Card Member receivables, net 25,832 24,429    
Global Consumer Services Group [Member]        
Accounts Receivable [Abstract]        
Card Member receivables 8,902 8,485    
Global Commercial Services [Member]        
Accounts Receivable [Abstract]        
Card Member receivables $ 17,105 $ 16,111