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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Income Tax Contingency [Line Items]          
Estimated effective tax rate     25.80%   22.50%
Effective tax rate 16.20% 24.20% 19.20% 17.30%  
Total favorable discrete items $ 47   $ 83    
Net favorable tax audit settlements and expirations of statutes of limitations $ 46   62 $ 39  
Benefit relating to the U.S. domestic production activities deduction     $ 16    
Total unfavorable discrete items   $ 6      
Net unfavorable tax charge related to the sale of joint venture       $ 49