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Financial instruments - Additional information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Feb. 16, 2023
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   $ 9,256 $ 9,673 $ 9,179
Equity shares and quoted funds   218 181  
Accounting loss $ 123      
Borrowing costs capitalised $ 50      
Oyu Tolgoi        
Disclosure of detailed information about financial instruments [line items]        
Deferral of the principal repayments (in years) 3 years      
Extension of final maturity date (in years) 5 years      
Forecast        
Disclosure of detailed information about financial instruments [line items]        
Expected unconditional guaranteed royalty payments to be received   97    
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   192 157  
Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   9,256    
Level 1 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   4,129 2,722  
Equity shares and quoted funds   $ 82 85  
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   $ 221    
Decrease in carrying value of renewable power purchase agreements due to forecast electricity prices   $ 221    
Change in coal spot price   15.00%    
Increase in carrying value of forward contract due to coal spot price assumptions   $ 26 64  
Decrease in carrying value of forward contract due to decrease in spot price   81 39  
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   7 0  
Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   0 0  
Equity shares and quoted funds   136 96  
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   $ 279 $ 214