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Other Noncurrent Assets - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Noncurrent Assets [Line Items]          
Sales of investments     $ 280 $ 40 $ 57
Proceeds from sale of company-owned life insurance policies $ 223 $ 234      
Exchange Traded Fixed Income and Equity Securities [Member]          
Other Noncurrent Assets [Line Items]          
Sales of investments     130    
Loss on sale of investment     3    
Loss on sale of investment, after tax     $ (2)