Earnings Per Share (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share
Number of common shares outstanding at end of period	401.4	402.8	401.4	402.8
Effect of using weighted average common shares outstanding	0.1	1.2	0.1	3.0
Weighted average basic common shares outstanding	401.5	404.0	401.5	405.8
Dilutive effect of equity-based compensation awards and other contingently issuable shares	1.7	1.9	1.7	1.8
Weighted average diluted common shares outstanding	403.2	405.9	403.2	407.6
Potentially issuable shares	4.8	5.3	4.8	5.3
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.2	1.0	1.3	1.4