Common Stock Issued and Outstanding (Activity in the Number of Common Stock Shares Issued and Outstanding) (Details)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Equity [Abstract]
At beginning of year	183,406,513		190,641,317		193,723,208
Stock options exercised	119,994	[1]	303,685	[1]	482,974	[1]
Restricted stock awards	339,985	[1]	300,910	[1]	224,296	[1]
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

[1] 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.