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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, 2019
Mar. 31, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Weighted-average shares outstanding 422.8 485.4
Share-based payment awards classified as participating securities [1] 0.2 0.6
Basic weighted-average shares outstanding 423.0 486.0
Dilutive securities [2] 0.0 0.0
Diluted weighted-average shares outstanding 423.0 486.0
[1] For the three months ended March 31, 2019 and 2018, dividends and equivalents for share-based awards that are expected to be forfeited do not have a material effect on net income for basic and diluted earnings per share.
[2] The three months ended March 31, 2019 and 2018 excludes 0.4 million and 1.0 million, respectively, potentially dilutive share-based awards as their effect would be anti-dilutive.