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Dividends - Additional information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 19, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of Dividends [Line Items]
Decrease to franking account balance		$ 358
– Rio Tinto Limited
Disclosure of Dividends [Line Items]
Franking credits available		$ 9,177	$ 8,734	$ 7,246
– Rio Tinto Limited | Final Dividends
Disclosure of Dividends [Line Items]
Franked final dividend percentage		30.00%	30.00%	30.00%
Potential ordinary share transactions
Disclosure of Dividends [Line Items]
Final dividends per share: proposed in the announcement of the results for the year (in usd per share)	$ 2.250
Dividends payment proposed in the announcement of the results for the year	$ 3,652

X

- Definition

The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

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Disclosure of Dividends [Line Items]

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- Definition

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+ References

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- Definition

Increase (Decrease) To Retained Profits And Reserves That Could Be Distributed As Fully Franked Dividends

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- Definition

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