Details of Certain Consolidated Statements of Income Lines (Details 3) (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 Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 963	$ 575	$ 1,747	$ 1,142
Occupancy and equipment [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	446	391	884	785
Communications [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	95	92	191	187
Mastercard and Visa settlements [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	0	(213)	0	(426)
Other net expenses [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 422	$ 305	$ 672	$ 596