Stockholders' Equity - Shares of Common Stock (Detail) - shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	208,289,178	209,709,046	219,012,050
Incentive Plan and Awards (in shares)	1,162,484	1,512,035	1,688,931
Stock Options Exercised (in shares)	837,757	344,686	786,931
Treasury Stock Purchased (in shares)	(2,527,544)	(3,276,589)	(11,778,866)
Ending balance (in shares)	207,761,875	208,289,178	209,709,046