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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Computation of Basic Earnings Per Share        
Net income $ 240 $ 192 $ 447 $ 364
Weighted average shares outstanding 272.4 292.5 275.1 294.3
Basic earnings per share (in USD per share) $ 0.88 $ 0.66 $ 1.63 $ 1.24
Computation of Diluted Earnings Per Share        
Net income $ 240 $ 192 $ 447 $ 364
Weighted average shares outstanding 272.4 292.5 275.1 294.3
Effect of dilutive securities        
Shares for diluted earnings per share 277.3 298.7 280.6 301.2
Diluted earnings per share (in USD per share) $ 0.87 $ 0.64 $ 1.59 $ 1.21
Employee stock option and appreciation right plans        
Effect of dilutive securities        
Effect of dilutive securities 2.3 3.0 2.4 3.2
Deferred stock incentive plans        
Effect of dilutive securities        
Effect of dilutive securities 0.6 0.7 0.6 0.8
Restricted stock units        
Effect of dilutive securities        
Effect of dilutive securities 2.0 2.5 2.5 2.9