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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Property, Plant and Equipment [Abstract]    
Capital expenditures $ 410 $ 445
Accrued capital expenditures unpaid 236 195
Payments for capital expenditures accrued in the prior year $ 275 $ 334