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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]        
Effective tax rate 10.30% 26.60%   20.50%
Total favorable discrete items $ 56      
Net favorable tax audit settlements and expirations of statutes of limitations $ 39      
Total unfavorable discrete items   $ 25    
Net unfavorable tax charge related to the sale of joint venture   $ 32    
Scenario, Forecast        
Income Tax Contingency [Line Items]        
Estimated effective tax rate     22.00%