Common Stock Issued and Outstanding (Tables)

12 Months Ended

Dec. 31, 2014

Equity [Abstract]

Activity in Number of Shares of Common Stock Issued and Outstanding

(Number of shares outstanding)	2014	2013	2012
At beginning of year	183,406,513	190,641,317	193,723,208
Stock options exercised*	119,994	303,685	482,974
Restricted stock awards*	339,985	300,910	224,296
Employee stock purchase and thrift plans	6,739	16,020	78,389
Treasury shares purchased	(6,373,718)	(7,855,419)	(3,867,550)
At end of year	177,499,513	183,406,513	190,641,317

*Shares issued upon exercise of stock options and award of restricted stock are less than the amount reflected in Note J due to withholdings for statutory income taxes owed upon issuance of shares.