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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Weighted-average shares outstanding 470.7 489.6 480.6 485.2
Share-based payment awards classified as participating securities 0.3 0.8 0.5 1.1
Basic weighted-average shares outstanding 471.0 490.4 481.1 486.3
Dilutive securities   1.1   1.6
Diluted weighted-average shares outstanding 471.0 491.5 481.1 487.9