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Customer Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
U.S.:    
Interest-bearing $ 60,573 $ 52,316
Non-interest-bearing 337 367
Non-U.S.:    
Interest-bearing 32 58
Non-interest-bearing 348 301
Total customer deposits 61,290 53,042
Card Member Credit Balances [Member]    
U.S.:    
Non-interest-bearing 300 331
Non-U.S.:    
Non-interest-bearing $ 334 $ 285