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Details of Certain Consolidated Statements of Income Lines (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Component of Other Income, Nonoperating [Line Items]      
Total other commissions and fees $ 2,317 $ 2,269 $ 2,031
Foreign currency conversion revenue [Member]
     
Component of Other Income, Nonoperating [Line Items]      
Total other commissions and fees 855 861 838
Delinquency fees [Member]
     
Component of Other Income, Nonoperating [Line Items]      
Total other commissions and fees 604 567 605
Service fees [Member]
     
Component of Other Income, Nonoperating [Line Items]      
Total other commissions and fees 362 355 328
Other commissions and fees [Member]
     
Component of Other Income, Nonoperating [Line Items]      
Total other commissions and fees $ 496 $ 486 $ 260