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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Basic weighted average shares outstanding (in shares) 425.4 424.3 425.2 424.1
Dilutive securities (in shares) 3.1 1.1 2.7 0.0
Diluted weighted average shares outstanding (in shares) 428.5 425.4 427.9 424.1