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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Abstract]    
Capital expenditures $ 639 $ 630
Accrued capital expenditures unpaid 237 203
Payments for capital expenditures accrued in the prior year $ 275 $ 334