Details of Certain Consolidated Statements of Income Lines (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 1,536	$ 1,502	$ 4,685	$ 4,052
Occupancy and equipment [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	453	433	1,337	1,218
Communications [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	93	93	284	280
Mastercard and Visa settlements [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	0	(68)	0	(494)
Other net expenses [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	300	354	972	950
Professional Fees [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 690	$ 690	$ 2,092	$ 2,098