Details of Certain Consolidated Statements of Income Lines (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 784	$ 567
Occupancy and equipment [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	438	394
Communications [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	96	95
Mastercard and Visa settlements [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	0	(213)
Other net expenses [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 250	$ 291