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Financial instruments - Carrying amounts and fair values (Detail) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Borrowings (including overdrafts), carrying value $ 12,882 $ 13,001
Borrowings (including overdrafts), fair value 12,807 13,256
Listed bonds    
Disclosure of detailed information about borrowings [line items]    
Borrowings (including overdrafts), carrying value 8,532 8,607
Borrowings (including overdrafts), fair value 8,221 8,672
Oyu Tolgoi project finance    
Disclosure of detailed information about borrowings [line items]    
Borrowings (including overdrafts), carrying value 3,851 3,850
Borrowings (including overdrafts), fair value 4,085 4,090
Other    
Disclosure of detailed information about borrowings [line items]    
Borrowings (including overdrafts), carrying value 499 544
Borrowings (including overdrafts), fair value $ 501 $ 494