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Financial instruments and risk management - Summary of techniques to value significant fair value assets/(liabilities) categorised under level 2 and 3 (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Level 2 | Discounted cash flows | Applicable market quoted swap yield curves Credit default spread | Interest rate swaps
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, fair value	$ (156)	$ (163)
Level 2 | Discounted cash flows | Applicable market quoted swap yield curves Credit default spread Market quoted FX rate | Cross-currency interest rate swaps
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, fair value	(187)	(266)
Level 2 | Closely related listed product | Applicable forward quoted metal price | Provisionally priced receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets, fair value	1,374	1,362
Level 3 | Discounted cash flows | Forward electricity price Energy volume | Renewable power purchase agreements
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, fair value	(111)	0
Level 3 | Discounted cash flows | Forward commodity price Mine production | Royalty receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets, fair value	252	214
Level 3 | Option pricing model | LME forward aluminium price Midwest premium and billet premium | Derivatives embedded in electricity contracts
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, fair value	$ (132)	$ (186)

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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