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Property, Plant and Equipment - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Property, Plant and Equipment [Abstract]    
Capital expenditures $ 465 $ 532
Accrued capital expenditures unpaid 217 268
Payments for capital expenditures accrued in the prior year $ 331 $ 357