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Financial instruments - Additional information (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Feb. 16, 2023
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   $ 9,179 $ 6,775 [1] $ 11,412
Provisionally priced receivables   1,154 1,234  
Expected unconditional guaranteed royalty payments to be received   191 209  
Expected unconditional guaranteed royalty payments to be received, unadjusted   $ 82    
Increase (decrease) in change in coal spot price   (15.00%)    
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      
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   152 153  
Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   9,179 6,775  
Level 1        
Disclosure of detailed information about financial instruments [line items]        
Bonds, carrying value   8,400 6,600  
Bonds, fair value   8,400 6,600  
Level 1 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   $ 2,455 2,725  
Level 3        
Disclosure of detailed information about financial instruments [line items]        
Increase (decrease) in change in coal spot price   15.00%    
Increase in carrying value of forward contract due to coal spot price assumptions   $ 61 68  
Decrease in carrying value of forward contract due to decrease in spot price   21 18  
Borrowings   3,800 3,800  
Level 3 | Fair value        
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents   0 0  
Borrowings   4,100 3,900  
Level 3 | Aluminium forward contracts embedded in electricity purchase contracts        
Disclosure of detailed information about financial instruments [line items]        
Long-term embedded derivatives at fair value   $ 79 $ 208  
[1] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.