Earnings Per Share (Detail) - shares shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share
Number of common shares outstanding at end of period	401.5	407.9	416.1
Effect of using weighted average common shares outstanding	3.4	4.9	4.3
Weighted average basic common shares outstanding	404.9	412.8	420.4
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.0	2.2	2.5
Weighted average diluted common shares outstanding	406.9	415.0	422.9
Potentially issuable shares	5.0	5.2	5.7
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.0	1.1	0.6