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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 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Computation of Basic Earnings Per Share            
Net (loss) income $ (234) $ 31 $ 232 $ 375 $ (203) $ 607
Shares for basic earnings per share (in shares) 325.6   333.8   325.5 336.7
Basic earnings per share (in USD per share) $ (0.72)   $ 0.70   $ (0.63) $ 1.80
Computation of Diluted (Loss) Earnings Per Share            
Net (loss) income $ (234) $ 31 $ 232 $ 375 $ (203) $ 607
Shares for basic earnings per share (in shares) 325.6   333.8   325.5 336.7
Effect of dilutive securities            
Share-based compensation (in shares) 0.0   2.6   0.0 2.9
Shares for diluted earnings per share (in shares) 325.6   336.4   325.5 339.6
Diluted earnings per share (in USD per share) $ (0.72)   $ 0.69   $ (0.63) $ 1.79
Antidilutive shares (in shares) 0.8       1.4