Common Stock Issued and Outstanding (Activity in the Number of Common Stock Shares Issued and Outstanding) (Details) - shares		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
At beginning of year		177,499,513	183,406,513	190,641,317
Stock options exercised	[1]	15,575	119,994	303,685
Restricted stock awards	[1]	478,549	339,985	300,910
Employee stock purchase and thrift plans		8,387	6,739	16,020
Treasury shares purchased		(5,967,313)	(6,373,718)	(7,855,419)
At end of year		172,034,711	177,499,513	183,406,513

[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.