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Financial instruments and risk management - Summary of fair value of financial instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value $ 13,001 $ 11,071
Total Borrowings (including overdrafts), fair value 13,256 11,192
Listed bonds    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 8,607 6,631
Total Borrowings (including overdrafts), fair value 8,672 6,649
Oyu Tolgoi project finance    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 3,850 3,770
Total Borrowings (including overdrafts), fair value 4,090 3,928
Other    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 544 670
Total Borrowings (including overdrafts), fair value $ 494 $ 615