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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

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- Definition Represents amounts related to the estimated cost of points earned to date that are ultimately expected to be redeemed. + References No definition available. + Details
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- Definition The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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