Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Securities pledged	$ 11,674,370	$ 12,207,123
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)	360,404,901	362,617,423
Treasury stock (in shares)	55,967,814	53,755,292