Condensed Consolidated Statements Of Financial Condition (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property and equipment, accumulated depreciation	$ 564	$ 483
Intangible assets, accumulated amortization	$ 859	$ 751
Common stock, par value	$ 0.01	$ 0.01
Common stock, Shares authorized	500,000,000	500,000,000
Common stock, Shares issued	168,661,718	139,880,380
Common stock, Shares outstanding	167,102,878	138,463,135
Escrow shares, common shares	3,603,000,000	3,603,000,000
Treasury stock, common shares	1,555,237,000,000	1,413,642,000,000