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Financial instruments - Summary of valuation techniques and inputs (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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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 | $ 1,080 | $ 1,362
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 | 279 | 214
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 | (212) | (163)
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 | (283) | (266)
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 | (7) | 0
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 | $ (157) | $ (186)

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