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Other Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Summary of other liabilities    
Membership Rewards liability $ 6,151 $ 5,832
Employee-related liablities 2,227 2,224
Rebate and reward accruals 2,210 2,079
Deferred card fees, net 1,314 1,286
Book overdraft balances 442 532
Other 4,566 5,604
Total 16,910 17,557
Carrying amount of deferred charge card and other fees    
Deferred charge card and other fees 1,609 1,566
Deferred direct acquisition costs (164) (154)
Reserves for membership cancellations (131) (126)
Total $ 1,314 $ 1,286