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Card Member Receivables and Loans (Details 1) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Card Member loans        
Less: Reserve for losses $ 5 $ 5 $ 5 $ 4
Card Member loans, less reserves 455 471    
International Consumer and Network Services [Member]        
Card Member loans        
Card Member loans $ 460 $ 476