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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Detail) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Weighted-average shares outstanding 485.8 483.3 485.6 483.0
Share-based payment awards classified as participating securities 0.4 1.0 0.5 1.2
Basic weighted-average shares outstanding 486.2 484.3 486.1 484.2
Dilutive securities   1.6   1.6
Diluted weighted-average shares outstanding 486.2 485.9 486.1 485.8