Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Cash and investments segregated and on deposit for regulatory purposes, resale agreements	$ 8,088	$ 10,186
Securities held to maturity, Fair Value	$ 50,088	$ 34,743
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 1,485	$ 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	167,205,881	176,821,202