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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]              
Effective tax rate 24.20% 19.00%   17.30% 22.40%   19.00%
Total favorable discrete items $ 6     $ 49      
Net favorable tax audit settlements and expirations of statutes of limitations   $ 11   $ 39 $ 33    
Total unfavorable discrete items   8     33    
Net unfavorable tax charge related to the sale of joint venture   $ 22 $ 32   $ 54    
Scenario, Forecast              
Income Tax Contingency [Line Items]              
Estimated effective tax rate           22.50%