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Intangible assets - Summary of useful lives of intangible assets (Detail)
 12 Months Ended
Dec. 31, 2023
Trademarks | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 14 years
Trademarks | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 20 years
Patented and non-patented technology | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 10 years
Patented and non-patented technology | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 20 years
Power contracts/water rights | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 2 years
Power contracts/water rights | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 45 years
Other purchase and customer contracts | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Other purchase and customer contracts | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 15 years
Internally generated intangible assets and computer software | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 2 years
Internally generated intangible assets and computer software | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 5 years
Other intangible assets | Bottom of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 2 years
Other intangible assets | Top of range  
Disclosure of detailed information about intangible assets [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 20 years