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Financial instruments - Additional information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 9,015 $ 8,495 $ 9,256
Equity shares and quoted funds 354 279  
Borrowings 22,031 12,442  
Financial and general covenants 3,921 3,945  
Forecast      
Disclosure of detailed information about financial instruments [line items]      
Expected unconditional guaranteed royalty payments to be received 104    
Financial assets measured at fair value through other comprehensive income, category      
Disclosure of detailed information about financial instruments [line items]      
Equity shares and quoted funds 279 221  
Level 1 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 3,033 4,893  
Equity shares and quoted funds $ 119 96  
Level 3      
Disclosure of detailed information about financial instruments [line items]      
Percentage change in forecast electricity prices 10.00%    
Increase in carrying value of renewable power purchase agreements due to forecast electricity prices $ 569 499  
Decrease in carrying value of renewable power purchase agreements due to forecast electricity prices $ 570 500  
Change in coal spot price 15.00%    
Increase in carrying value of forward contract due to coal spot price assumptions $ 25 24  
Decrease in carrying value of forward contract due to decrease in spot price 122 61  
Level 3 | Discounted cash flows | Forward Electricity Price And Energy Volume | Renewable power purchase agreements      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities, at fair value (4) (111)  
Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Equity shares and quoted funds 235 183  
Level 3 | Royalty receivables | Discounted cash flows | Forward Commodity Price And Mine Production, Measurement Input      
Disclosure of detailed information about financial instruments [line items]      
Financial assets, at fair value $ 265 $ 252