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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
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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

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