CONSOLIDATED STATEMENT OF INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended		9 Months Ended	0 Months Ended	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012 Akbank	Mar. 31, 2012 Akbank	Sep. 30, 2012 Akbank	Jun. 21, 2013 Morgan Stanley Smith Barney joint venture	Sep. 30, 2012 Morgan Stanley Smith Barney joint venture	Dec. 31, 2012 Morgan Stanley Smith Barney joint venture	Sep. 16, 2012 Morgan Stanley Smith Barney joint venture
Impairment charge related to investment	$ 3,340		$ 1,200	$ 1,181		$ 3,340
Percentage of ownership interest held			20.00%		35.00%	35.00%	35.00%	49.00%
Loss on investment sold		$ 424		$ 424		$ 1,344
Ownership interest sold by entity (as a percent)		10.10%		10.10%	35.00%	14.00%