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Financial instruments - Summary of valuation techniques and inputs (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Level 2 | Applicable Forward Quoted Metal Prices, Measurement Input | Closely related listed product | Provisionally priced receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | $ 1,058 | $ 1,374
Level 3 | Forward Commodity Price And Mine Production, Measurement Input | Discounted cash flows | Royalty receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets, at fair value | 265 | 252
Interest rate swaps | Level 2 | Applicable Market Quoted Swap Yield Curves and Credit Spread, Measurement Input | Discounted cash flows |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities, at fair value |  | (156)
Financial assets, at fair value | 68 |
Cross-currency interest rate swaps | Level 2 | Applicable Market Quoted Swap Yield Curves, Credit Spread And Market Quoted Foreign Exchange Rate, Measurement Input | Discounted cash flows |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities, at fair value | (137) | (187)
Renewable power purchase agreements | Level 3 | Forward Electricity Price And Energy Volume | Discounted cash flows |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities, at fair value | (4) | (111)
Derivatives embedded in electricity contracts | Level 3 | LME Forward Aluminum Price And Midwest Premium And Billet Premium, Measurement Input | Option pricing model |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities, at fair value | $ (152) | $ (132)

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