Details of Certain Consolidated Statements of Income Lines (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Component of Other Income, Nonoperating [Line Items]
Total other commissions and fees	$ 584	$ 497	$ 1,113	$ 997
Foreign currency conversion revenue [Member]
Component of Other Income, Nonoperating [Line Items]
Total other commissions and fees	213	205	426	393
Delinquency fees [Member]
Component of Other Income, Nonoperating [Line Items]
Total other commissions and fees	142	153	285	312
Service fees [Member]
Component of Other Income, Nonoperating [Line Items]
Total other commissions and fees	89	80	176	162
Other Commissions [Member]
Component of Other Income, Nonoperating [Line Items]
Total other commissions and fees	$ 140	$ 59	$ 226	$ 130