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Capital Stock, Dividends and Common Stock Repurchase Program - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2016
Nov. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Repurchase Program [Line Items]          
Common stock, shares authorized 1,500,000,000   1,500,000,000 1,500,000,000  
Common stock, par value $ 0.01   $ 0.01 $ 0.01  
Common stock, shares issued 630,282,461   630,282,461 630,282,461  
Common stock, shares outstanding 439,300,000   439,300,000 447,200,000 458,500,000
Preferred stock shares authorized 10,000,000   10,000,000    
Preferred stock par value per share $ 0.01   $ 0.01    
Preferred stock shares outstanding 0   0    
Cash dividends     $ 726,000,000 $ 695,000,000 $ 693,000,000
Cash dividends declared and paid per common share $ 0.41   $ 1.64 $ 1.54 $ 1.50
Common stock repurchases     $ 725,000,000 $ 600,000,000 $ 600,000,000
Maximum capital allocated for repurchases of shares $ 750,000,000   750,000,000    
Additional Paid-In Capital [Member]          
Stock Repurchase Program [Line Items]          
Common stock repurchases     45,000,000 (180,000,000) $ 180,000,000
Accelerated Share Repurchase Agreement (ASR) [Member]          
Stock Repurchase Program [Line Items]          
Common stock repurchases   $ 225,000,000   $ 600,000,000  
Accelerated Share Repurchase Agreement (ASR) [Member] | Additional Paid-In Capital [Member]          
Stock Repurchase Program [Line Items]          
Common stock repurchases     $ 45,000,000    
Dividend Declared [Member]          
Stock Repurchase Program [Line Items]          
Expected quarterly common stock dividend per share declared $ 0.425        
Dividends Payable, Year 2017   2017