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Inventories - Schedule of Inventory Components (Detail) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Finished goods	$ 326	$ 355
Work-in-process	281	287
Bauxite and alumina	563	586
Purchased raw materials	648	700
Operating supplies	230	230
Inventories, total	$ 2,048	$ 2,158

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