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Other Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Summary of other liabilities    
Membership Rewards reserves $ 5,066 $ 4,500
Employee-related liablities 2,192 2,026
Book overdraft balances 3,091 1,185
Rebate and reward accruals 1,866 1,555
Deferred charge card fees, net 1,063 1,036
Other 4,792 5,291
Total 18,070 15,593
Carrying amount of deferred charge card and other fees    
Deferred charge card and other fees 1,228 1,194
Deferred direct acquisition costs (75) (67)
Reserves for membership cancellations (90) (91)
Total $ 1,063 $ 1,036