Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Securities pledged	$ 10,458,629	$ 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)	359,671,338	362,617,423
Treasury stock (in shares)	56,701,377	53,755,292