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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