Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Analysis of Changes in Number of Shares of Common Stock Outstanding

An analysis of changes in the number of shares of common stock outstanding follows:

TABLE 78: SHARES OF COMMON STOCK

	2017		2016		2015
Balance at January 1	228,605,485		229,293,783		233,390,705
Incentive Plan and Awards	1,320,129		1,209,124		1,033,664
Stock Options Exercised	1,997,362		4,156,728		1,721,282
Treasury Stock Purchased	(5,796,302	)	(6,054,150	)	(6,851,868	)
Balance at December 31	226,126,674		228,605,485		229,293,783