Other Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Summary of other liabilities
Membership Rewards liability	$ 6,721	$ 6,521
Employee-related liablities	2,097	2,258
Rebate and reward accruals	2,238	2,073
Deferred card and other fees, net	1,343	1,308
Book overdraft balances	409	647
Other	4,764	5,044
Total	17,572	17,851
Carrying amount of deferred charge card and other fees
Deferred card and other fees	1,652	1,615
Deferred direct acquisition costs	(173)	(176)
Reserves for membership cancellations	(136)	(131)
Total	$ 1,343	$ 1,308