Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

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 96: SHARES OF COMMON STOCK

	2020	2019	2018
Balance at January 1	209,709,046	219,012,050	226,126,674
Incentive Plan and Awards	1,512,035	1,688,931	1,310,778
Stock Options Exercised	344,686	786,931	575,662
Treasury Stock Purchased	(3,276,589)	(11,778,866)	(9,001,064)
Balance at December 31	208,289,178	209,709,046	219,012,050