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Capital Stock, Dividends and Common Stock Repurchase Program - Share Repurchases under Common Stock Repurchase Programs (Parenthetical) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 28, 2017
Nov. 30, 2016
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock Repurchase Programs [Line Items]            
Cash paid for repurchase of common stock       $ 725 $ 600 $ 600
Common stock repurchases       $ 725 $ 600 $ 600
Shares of common stock received under ASR       11,241 14,823 9,569
Accelerated Share Repurchase Agreement (ASR) [Member]            
Stock Repurchase Programs [Line Items]            
Accelerated share repurchase, price per share   $ 63.41        
Cash paid for repurchase of common stock     $ 225 $ 725    
Common stock repurchases   $ 225     $ 600  
Shares of common stock received under ASR   2,800     2,800  
Common stock repurchases           $ 600
Subsequent Event [Member] | Accelerated Share Repurchase Agreement (ASR) [Member]            
Stock Repurchase Programs [Line Items]            
Shares of common stock received under ASR 400          
Weighted Average [Member]            
Stock Repurchase Programs [Line Items]            
Final weighted average per share purchase price during the repurchase period         $ 48.58  
Weighted Average [Member] | Subsequent Event [Member] | Accelerated Share Repurchase Agreement (ASR) [Member]            
Stock Repurchase Programs [Line Items]            
Final weighted average per share purchase price during the repurchase period $ 69.43