Details of Certain Consolidated Statements of Income Lines (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 1,534	$ 1,674	$ 3,064	$ 3,149
Professional services [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	763	711	1,479	1,402
Occupancy and equipment [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	460	446	932	884
Communications [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	92	95	188	191
Other net expenses [Member]
Component of Operating Other Cost and Expense [Line Items]
Total other, net expense	$ 219	$ 422	$ 465	$ 672