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Financial instruments - Additional information (Detail) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 16, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents |  | $ 9,256 | $ 9,673 | $ 9,179
Equity shares and quoted funds |  | 218 | 181 |
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 |  |  |
Forecast |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Expected unconditional guaranteed royalty payments to be received |  | 97 |  |
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 |  | 192 | 157 |
Fair value |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents |  | 9,256 |  |
Level 1 | Fair value |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents |  | 4,129 | 2,722 |
Equity shares and quoted funds |  | $ 82 | 85 |
Level 3 |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Percentage change in forecast electricity prices |  | 10.00% |  |
Increase in carrying value of renewable power purchase agreements due to forecast electricity prices |  | $ 221 |  |
Decrease in carrying value of renewable power purchase agreements due to forecast electricity prices |  | $ 221 |  |
Change in coal spot price |  | 15.00% |  |
Increase in carrying value of forward contract due to coal spot price assumptions |  | $ 26 | 64 |
Decrease in carrying value of forward contract due to decrease in spot price |  | 81 | 39 |
Level 3 | Discounted cash flows | Forward Electricity Price And Energy Volume | Renewable power purchase agreements |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities, at fair value |  | 7 | 0 |
Level 3 | Fair value |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Equity shares and quoted funds |  | 136 | 96 |
Level 3 | Royalty Receivables | Discounted cash flows | Forward Commodity Price And Mine Production, Measurement Input |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial assets, at fair value |  | $ 279 | $ 214 |

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- Definition Adjustments For Impairment Loss (Reversal Of Impairment Loss) Recognised In Profit Or Loss, Borrowings + References No definition available. + Details
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- Definition Borrowings, Principal Repayments, Deferral Term + References No definition available. + Details
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- Definition Decrease in carrying value of forward contract due to decrease in spot price. + References No definition available. + Details
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- Definition Decrease In Carrying Value Of Renewable Power Purchase Agreements Due To Forecast Electricity Prices + References No definition available. + Details
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- Definition Increase in carrying value of forward contract due to coal spot price assumptions. + References No definition available. + Details
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