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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]        
Capital expenditures     $ 909 $ 1,178
Accrued capital expenditures unpaid     274  
Payments for capital expenditures accrued in the prior year     322  
Asset impairment charges     262 195
2014-2018 Restructuring Program        
Property, Plant and Equipment [Line Items]        
Asset impairment charges $ 120 $ 56 $ 233 $ 191