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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Property, Plant and Equipment [Line Items]    
Capital expenditures $ 532 $ 488
Accrued capital expenditures unpaid 268 190
Payments for capital expenditures accrued in the prior year $ 357 $ 343