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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, 2018
Mar. 31, 2017
Computation of Basic Earnings Per Share    
Net income $ 398 $ 371
Shares for basic earnings per share (in shares) 358.4 384.9
Basic earnings per share (in USD per share) $ 1.11 $ 0.96
Computation of Diluted Earnings Per Share    
Net income $ 398 $ 371
Shares for basic earnings per share (in shares) 358.4 384.9
Effect of dilutive securities    
Share-based compensation (in shares) 4.9 5.1
Shares for diluted earnings per share (in shares) 363.3 390.0
Diluted earnings per share (in USD per share) $ 1.09 $ 0.95