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Details of Certain Consolidated Statements of Income Lines (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Component of Other Income, Nonoperating [Line Items]        
Other commissions and fees $ 575 $ 584 $ 1,158 $ 1,113
Foreign currency conversion revenue [Member]
        
Component of Other Income, Nonoperating [Line Items]        
Other commissions and fees 216 213 423 426
Delinquency fees [Member]
        
Component of Other Income, Nonoperating [Line Items]        
Other commissions and fees 158 142 320 285
Service fees [Member]
        
Component of Other Income, Nonoperating [Line Items]        
Other commissions and fees 89 89 182 176
Other Commissions And Fees [Member]
        
Component of Other Income, Nonoperating [Line Items]        
Other commissions and fees $ 112 $ 140 $ 233 $ 226