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Property, Plant, and Equipment, Net - Summary of Property, Plant, and Equipment, Net (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]      
Property, plant, and equipment $ 9,582 $ 9,413  
Less: Accumulated depreciation (6,108) (5,854)  
Property, plant, and equipment, net 3,474 3,559 $ 3,291
Equipment [Member]      
Property Plant And Equipment [Line Items]      
Property, plant, and equipment 7,816 7,600  
Building [Member]      
Property Plant And Equipment [Line Items]      
Property, plant, and equipment 1,198 1,174  
Construction-in-progress [Member]      
Property Plant And Equipment [Line Items]      
Property, plant, and equipment 421 493  
Land [Member]      
Property Plant And Equipment [Line Items]      
Property, plant, and equipment 111 110  
Mineral rights [Member]      
Property Plant And Equipment [Line Items]      
Property, plant, and equipment $ 36 $ 36