Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Condensed Consolidated Balance Sheets [Abstract]
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 11,729	$ 14,016
Securities held to maturity, fair value	33,939	29,490
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 885	$ 885
Common stock, shares authorized	3,000,000,000	3,000,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	1,487,543,446	1,487,543,446
Treasury stock, shares	181,992,826	190,657,263