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Financial instruments - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | $ 9,015 | $ 8,495 | $ 9,256
Equity shares and quoted funds | 354 | 279 |
Borrowings | 22,031 | 12,442 |
Financial and general covenants | 3,921 | 3,945 |
Forecast |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Expected unconditional guaranteed royalty payments to be received | 104 |  |
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 | 279 | 221 |
Level 1 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 3,033 | 4,893 |
Equity shares and quoted funds | $ 119 | 96 |
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 | $ 569 | 499 |
Decrease in carrying value of renewable power purchase agreements due to forecast electricity prices | $ 570 | 500 |
Change in coal spot price | 15.00% |  |
Increase in carrying value of forward contract due to coal spot price assumptions | $ 25 | 24 |
Decrease in carrying value of forward contract due to decrease in spot price | 122 | 61 |
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 | (4) | (111) |
Level 3 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Equity shares and quoted funds | 235 | 183 |
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 | $ 265 | $ 252 |

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