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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Property, Plant and Equipment [Line Items]        
Capital expenditures     $ 488 $ 604
Accrued capital expenditures unpaid     190 222
Payments for capital expenditures accrued in the prior year     343 322
Asset impairments and accelerated depreciation     168 142
2014-2018 Restructuring Program        
Property, Plant and Equipment [Line Items]        
Asset impairments and accelerated depreciation $ 47 $ 61 $ 118 $ 113