Earnings Per Share (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share
Common shares outstanding (in shares)	410.5	418.3	410.5	418.3
Effect of using weighted average common shares outstanding	1.5	1.2	3.5	3.0
Weighted average basic common shares outstanding	412.0	419.5	414.0	421.3
Dilutive effect of equity-based compensation awards and other contingently issuable shares	2.3	2.5	2.2	2.3
Weighted average diluted common shares outstanding	414.3	422.0	416.2	423.6
Potentially issuable shares (in shares)	5.3	5.8	5.3	5.8
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	0.6	0.6	1.2	0.6