Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

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

	2018		2017		2016
Balance at January 1	226,126,674		228,605,485		229,293,783
Incentive Plan and Awards	1,310,778		1,320,129		1,209,124
Stock Options Exercised	575,662		1,997,362		4,156,728
Treasury Stock Purchased	(9,001,064	)	(5,796,302	)	(6,054,150	)
Balance at December 31	219,012,050		226,126,674		228,605,485