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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Line Items]        
Capital expenditures     $ 721 $ 909
Accrued capital expenditures unpaid     220 274
Payments for capital expenditures accrued in the prior year     343 322
Asset impairments and accelerated depreciation     287 262
2014-2018 Restructuring Program        
Property, Plant and Equipment [Line Items]        
Asset impairments and accelerated depreciation $ 46 $ 120 $ 164 $ 233