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About the presentation of our financial statements - Additional information (Detail) $ in Millions, $ in Millions | 12 Months Ended | 72 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 AUD ($) | Dec. 31, 2023 AUD ($)
Disclosure of joint operations [line items] |  |  |  |  |
Materiality threshold | $ 700 |  |  |  |
Intragroup loans |  |  |  | $ 15,717 | $ 15,102
Carbon emission reduction target (%), 2025 | 15.00% |  |  |  |
Carbon emission reduction target (%), 2030 | 50.00% |  |  |  |
Carbon emission reduction target (%), 2050 | 0.00% |  |  |  |
Carbon emission reduction, percent |  |  | 14.00% |  |
Gross emissions, reduction target (%), 2030 | 40.00% |  |  |  |
Gross emissions reduction, use of offsets limitation (%) | 10.00% |  |  |  |
Investment in various decarbonisation projects, capitalised | $ 283 | $ 191 | $ 283 |  |
Operating expenditure and R&D costs | 306 | 234 |  |  |
Contractually committed decarbonisation capital commitments | 114 | 123 | 114 |  |
Investment in entities specialising in decarbonisation and related technology accounted as financial assets | 89 | 36 | 89 |  |
Cash royalty receipt | 45 | 38 |  |  |
Other intangible assets |  |  |  |  |
Disclosure of joint operations [line items] |  |  |  |  |
Carbon abatement spend | 50 | 61 |  |  |
Level 3 | Forward electricity price Energy volume | Discounted cash flows | Renewable power purchase agreements |  |  |  |  |
Disclosure of joint operations [line items] |  |  |  |  |
Financial liabilities, at fair value | 111 | 0 | 111 |  |
Royalty receivables | Level 3 | Forward commodity price Mine production | Discounted cash flows |  |  |  |  |
Disclosure of joint operations [line items] |  |  |  |  |
Financial assets, fair value | 252 | $ 214 | $ 252 |  |
Bottom of range |  |  |  |  |
Disclosure of joint operations [line items] |  |  |  |  |
Estimated incremental capital expenditures | 5,000 |  |  |  |
Top of range |  |  |  |  |
Disclosure of joint operations [line items] |  |  |  |  |
Estimated incremental capital expenditures | $ 6,000 |  |  |  |

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