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Financial instruments and risk management - Summary of changes in market price relevant to alumina purchase price swaps outstanding (Detail) - Commodity price risk - Aluminium - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |
Percentage increase in market price change | 10.00% |
Percentage decrease in market price change | (10.00%) |
Increase in market prices, effect on net earnings | $ (42) | $ (52)
Decrease in market prices, effect on net earnings | 69 | 67
Increase in market prices, effect on equity | (68) | (81)
Decrease in market prices, effect on equity | $ 42 | $ 70

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