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Card Member Receivables and Loans (Details 1) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Card Member loans        
Card Member loans $ 431 $ 435    
Less: Reserve for losses 4 4 $ 4 $ 3
Card Member loans, less reserves 427 431    
International Consumer and Network Services [Member]        
Card Member loans        
Card Member loans $ 431 $ 435