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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]    
Capital expenditures $ 810 $ 721
Accrued capital expenditures unpaid 249 220
Payments for capital expenditures accrued in the prior year $ 357 $ 343