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Earnings Per Share - Reconciliation of the Earnings (Losses) and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Computation of Basic Earnings Per Share    
Net income $ 365 $ 219
Shares for basic earnings per share (in shares) 384.9 254.4
Basic earnings per share (in USD per share) $ 0.95 $ 0.86
Computation of Diluted Earnings Per Share    
Net income $ 365 $ 219
Shares for basic earnings per share (in shares) 384.9 254.4
Effect of dilutive securities    
Effect of dilutive securities (in shares) 5.1 4.5
Shares for diluted earnings per share (in shares) 390.0 258.9
Diluted earnings per share (in USD per share) $ 0.94 $ 0.85