CONSOLIDATED STATEMENT OF INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012 Morgan Stanley Smith Barney joint venture	Sep. 30, 2012 Morgan Stanley Smith Barney joint venture	Sep. 16, 2012 Morgan Stanley Smith Barney joint venture	Jun. 30, 2012 Akbank	Mar. 31, 2012 Akbank	Sep. 30, 2012 Akbank
Percentage of ownership interest held	35.00%	35.00%	49.00%		20.00%
Impairment charge related to investment		$ 3,340			$ 1,200	$ 1,181
Loss on investment sold		$ 1,344		$ 424		$ 424
Ownership interest sold by entity (as a percent)	14.00%	14.00%				10.10%