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Inventories, Net - Summary of Consolidated Balance of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Classes of current inventories [abstract]    
Finished goods $ 309 $ 320
Work-in-process 164 195
Raw materials 192 194
Materials and spare parts 271 263
Inventory in transit 35 17
Current inventories $ 971 $ 989