Earnings Per Share (Detail) - shares shares in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share
Number of common shares outstanding at end of period	406.8	415.2
Effect of using weighted average common shares outstanding	0.6	0.5
Weighted average basic common shares outstanding	407.4	415.7
Dilutive effect of equity-based compensation awards and other contingently issuable shares	1.6	2.1
Weighted average diluted common shares outstanding	409.0	417.8
Potentially issuable shares	5.6	5.9
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.8	1.8