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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Detail) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Weighted-average shares outstanding 485.4 482.8
Share-based payment awards classified as participating securities 0.6 1.4
Basic weighted-average shares outstanding 486.0 484.2
Dilutive securities 1.0 1.6
Diluted weighted-average shares outstanding 487.0 485.8