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Other Liabilities (Details 1) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Carrying amount of deferred charge card and other fees    
Deferred card and other fees $ 1,767 $ 1,652
Deferred direct acquisition costs (204) (173)
Reserves for membership cancellations (152) (136)
Total $ 1,411 $ 1,343