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Cash and cash equivalents - Additional information (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of cash and cash equivalents [Line Items]
Restricted cash and cash equivalents	$ 422	$ 391
Repayment of third party borrowings	156	268
Reverse repurchase agreements	2,775	850
Fair value of collateral	2,924	892
Subsidiaries
Disclosure of cash and cash equivalents [Line Items]
Restricted cash and cash equivalents	553	576
Repayment of third party borrowings	$ 129	$ 336

X

- Definition

The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 15
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_15_a&doctype=Standard
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	debit
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X

- Definition

Disclosure of cash and cash equivalents [Line Items]

+ References

No definition available.

+ Details

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X

- Definition

Restricted cash and cash equivalent available to repay borrowings.

+ References

No definition available.

+ Details

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Namespace Prefix:	rio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Details

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Namespace Prefix:
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