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Impairment (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | $ (122) | $ 18
Impairment charges (reversal), taxation | 36 |
Non-controlling interests | 0 |
Net impairment (charges)/reversals in the income statement | (86) | 55
Impairment (charges)/reversals of consolidated balances | (122) | 41
Impairment charges related to EAUs (pre-tax) | 0 | (35)
Taxation | 36 | 49
Rio Tinto Iron and Titanium Quebec Operations ("RTITQO") | Minerals |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | (122) | 0
Impairment charges (reversal), taxation | 36 |
Non-controlling interests | 0 |
Net impairment (charges)/reversals in the income statement | (86) |
Tiwai Point | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | 0 | 41
Impairment charges (reversal), taxation | 0 |
Non-controlling interests | 0 |
Net impairment (charges)/reversals in the income statement | 0 |
Porto Trombetas (MRN) | Aluminium |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | 0 | (23)
Impairment charges (reversal), taxation | 0 |
Non-controlling interests | 0 |
Net impairment (charges)/reversals in the income statement | 0 |
Property, plant and equipment |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | (122) | 41
Share of profit after tax of equity accounted units |  |
Disclosure of impairment loss recognised or reversed for cash-generating unit [line items] |  |
Impairment charges (reversal), Pre-tax amount | $ 0 | $ (23)

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