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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]    
Capital expenditures $ 284 $ 306
Accrued capital expenditures unpaid 252 186
Payments for capital expenditures accrued in the prior year 357 343
Asset impairments and accelerated depreciation 28 80
2014-2018 Restructuring Program    
Property, Plant and Equipment [Line Items]    
Asset impairments and accelerated depreciation $ 23 $ 71