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Intangible assets - Additional information (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets $ 4,389 $ 3,645 [1] $ 2,832
Quebec smelters      
Disclosure of detailed information about intangible assets [Line Items]      
Discount rate used in current measurement of fair value less costs of disposal 6.60% 6.60%  
Water rights | Quebec smelters      
Disclosure of detailed information about intangible assets [Line Items]      
Intangible assets $ 1,776 $ 1,693  
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.