Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Securities pledged	$ 14,151,752	$ 14,794,488
Stockholders' Equity Attributable to Parent [Abstract]
Common shares, par value (USD per share)	$ 1	$ 1
Common shares, authorized (in shares)	600,000,000	600,000,000
Common shares, issued and outstanding after deducting shares held in treasury (in shares)	362,286,341	367,498,615
Treasury stock (in shares)	53,661,877	48,447,573