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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Total capital expenditures $ 863 $ 925 $ 1,095
Accrued capital expenditures unpaid $ 275 $ 334 $ 331