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Financial instruments - Additional information (Detail) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 16, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents |  | $ 9,179 | $ 6,775 | [1] | $ 11,412
Provisionally priced receivables |  | 1,154 | 1,234 |  |
Expected unconditional guaranteed royalty payments to be received |  | 191 | 209 |  |
Expected unconditional guaranteed royalty payments to be received, unadjusted |  | $ 82 |  |  |
Increase (decrease) in change in coal spot price |  | (15.00%) |  |  |
Accounting loss |  | $ 123 |  |  |
Borrowing costs capitalised |  | 50 |  |  |
Oyu Tolgoi |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Deferral of the principal repayments (in years) | 3 years |  |  |  |
Extension of final maturity date (in years) | 5 years |  |  |  |
Financial assets measured at fair value through other comprehensive income, category |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Equity shares and quoted funds |  | 152 | 153 |  |
Fair value |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents |  | 9,179 | 6,775 |  |
Level 1 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Bonds, carrying value |  | 8,400 | 6,600 |  |
Bonds, fair value |  | 8,400 | 6,600 |  |
Level 1 | Fair value |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents |  | $ 2,455 | 2,725 |  |
Level 3 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (decrease) in change in coal spot price |  | 15.00% |  |  |
Increase in carrying value of forward contract due to coal spot price assumptions |  | $ 61 | 68 |  |
Decrease in carrying value of forward contract due to decrease in spot price |  | 21 | 18 |  |
Borrowings |  | 3,800 | 3,800 |  |
Level 3 | Fair value |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Borrowings |  | 4,100 | 3,900 |  |
Level 3 | Aluminium forward contracts embedded in electricity purchase contracts |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Long-term embedded derivatives at fair value |  | $ 79 | $ 208 |  |
[1] | Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Expected unconditional guaranteed royalty payments to be received. + References No definition available. + Details
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