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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property, Plant and Equipment [Line Items]        
Capital expenditures     $ 604 $ 790
Accrued capital expenditures unpaid     222  
Payments for capital expenditures accrued in the prior year     322  
Asset impairment charges     142 138
2014-2018 Restructuring Program        
Property, Plant and Equipment [Line Items]        
Asset impairment charges $ 61 $ 57 $ 113 $ 135