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Financial instruments - Summary of valuation techniques and inputs (Details) - Fair value
$ in Millions
Jun. 30, 2022
USD ($)
Level 2 | Closely related listed product | Provisionally priced receivables  
Disclosure of detailed information about financial instruments [line items]  
Financial assets $ 1,155
Level 3 | Discounted cash flow | Royalty receivables  
Disclosure of detailed information about financial instruments [line items]  
Financial assets 235
Interest rate swaps | Level 2 | Discounted cash flow  
Disclosure of detailed information about financial instruments [line items]  
Financial liabilities (257)
Cross currency interest rate swaps | Level 2 | Discounted cash flow  
Disclosure of detailed information about financial instruments [line items]  
Financial liabilities (309)
Derivatives embedded in electricity contracts | Level 3 | Discounted cash flows/option model  
Disclosure of detailed information about financial instruments [line items]  
Financial liabilities $ (178)