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Details of Certain Consolidated Statements of Income Lines (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Component of Other Income, Nonoperating [Line Items] |  |
Other commissions and fees | $ 583 | $ 529
Foreign currency conversion revenue [Member] |  |
Component of Other Income, Nonoperating [Line Items] |  |
Other commissions and fees | 207 | 213
Delinquency fees [Member] |  |
Component of Other Income, Nonoperating [Line Items] |  |
Other commissions and fees | 162 | 143
Service fees [Member] |  |
Component of Other Income, Nonoperating [Line Items] |  |
Other commissions and fees | 93 | 87
Other Commissions And Fees [Member] |  |
Component of Other Income, Nonoperating [Line Items] |  |
Other commissions and fees | $ 121 | $ 86

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- Definition Fee and commission revenue earned from sources not otherwise specified in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number EITF85-24-1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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