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Earnings per ordinary share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Basic earnings per share [abstract]
Net earnings attributable to owners of Rio Tinto	$ 10,058	$ 12,392		$ 21,115
Weighted average number of shares (in shares)	1,621.4	1,619.8		1,618.4
Basic earnings per ordinary share (in usd per share)	$ 6.203	$ 7.650	[1]	$ 13.047	[1]
Diluted earnings per share [abstract]
Effect of dilutive securities shares (in shares)	10.1	9.8		10.5
Net earnings attributable to owners of Rio Tinto	$ 10,058	$ 12,392		$ 21,115
Weighted average number of shares (in shares)	1,631.5	1,629.6		1,628.9
Diluted earnings per share attributable to ordinary shareholders of Rio Tinto (in usd per share)	$ 6.165	$ 7.604	[1]	$ 12.963	[1]
Cross holdings of shares (in shares)	0.0	0.0		0.0
Rio Tinto plc
Basic earnings per share [abstract]
Weighted average number of shares (in shares)	1,250.5	1,248.9		1,247.4
Rio Tinto Limited
Basic earnings per share [abstract]
Weighted average number of shares (in shares)	370.9	370.9		371.0
[1] Comparative information has been restated to reflect the adoption of narrow-scope amendments to IAS 12. Refer to page 166 for details.

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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