Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Condensed Consolidated Balance Sheets [Abstract]
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 18,214	$ 19,325
Securities held to maturity, fair value	25,288	18,732
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	203,545,769	210,014,305