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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Capital expenditures $ 1,014 $ 1,224 $ 1,514
Accrued capital expenditures unpaid 357 343 322
Asset impairments and accelerated depreciation 334 446 345
2014-2018 Restructuring Program      
Property, Plant and Equipment [Line Items]      
Asset impairments and accelerated depreciation $ 206 $ 301 $ 264