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Financial instruments and risk management - Summary of fair value of financial instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value $ 12,442 $ 13,001
Total Borrowings (including overdrafts), fair value 12,221 13,256
Listed bonds    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 8,137 8,607
Total Borrowings (including overdrafts), fair value 7,702 8,672
Oyu Tolgoi project finance    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 3,852 3,850
Total Borrowings (including overdrafts), fair value 4,103 4,090
Other    
Disclosure of detailed information about borrowings [Line Items]    
Total Borrowings (including overdrafts), carrying value 453 544
Total Borrowings (including overdrafts), fair value $ 416 $ 494