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Financial instruments - Carrying amounts and fair values (Detail) $ in Millions | Mar. 12, 2025 USD ($) tranche | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings (including overdrafts), carrying value |  | $ 22,031 | $ 12,442
Borrowings (including overdrafts), fair value |  | 21,834 | 12,221
Listed bonds |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings (including overdrafts), carrying value |  | 17,355 | 8,137
Borrowings (including overdrafts), fair value |  | 16,944 | 7,702
Oyu Tolgoi project finance |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings (including overdrafts), carrying value |  | 3,854 | 3,852
Borrowings (including overdrafts), fair value |  | 4,109 | 4,103
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings (including overdrafts), carrying value |  | 822 | 453
Borrowings (including overdrafts), fair value |  | $ 781 | $ 416
Fixed And Floating Rate SEC-Registered Debt Securities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | $ 9,000 |  |
Number of tranches | tranche | 8 |  |
Three Year Note, Floating Rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | $ 500 |  |
Debt instrument period (in years) | 3 years |  |
Three Year Note, Floating Rate | Floating interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 0.84% |  |
Fixed Coupon Rate | Minimum | Fixed interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 4.375% |  |
Fixed Coupon Rate | Maximum | Fixed interest rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Basis spread on variable rate | 5.875% |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition Borrowings, Fair Value + References No definition available. + Details
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