Details of Certain Consolidated Statements of Income Lines (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Details Of Certain Statements Of Income Lines Details [Abstract]
Professional services	$ 793	$ 690	$ 2,272	$ 2,092
Occupancy and equipment	462	453	1,394	1,337
Communications	94	93	282	284
Other net expenses	269	300	734	972
Total other, net expense	$ 1,618	$ 1,536	$ 4,682	$ 4,685