Earnings Per Share (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share
Number of common shares outstanding at end of period	404.9	413.3	404.9	413.3
Effect of using weighted average common shares outstanding	1.0	1.1	2.5	1.7
Weighted average basic common shares outstanding	405.9	414.4	407.4	415.0
Dilutive effect of equity-based compensation awards and other contingently issuable shares	1.8	2.0	1.7	2.0
Weighted average diluted common shares outstanding	407.7	416.4	409.1	417.0
Potentially issuable shares	5.4	5.8	5.4	5.8
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	1.3	1.4	1.7	1.8