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Acquisitions and disposals - Additional information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure Of Acquisitions And Disposals [Line Items]
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates	$ 10	$ 10

X

- Definition

The aggregate cash flows arising from losing control of subsidiaries or other businesses, classified as investing activities. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 39
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_39&doctype=Standard
-URIDate 2020-01-01

+ Details

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

X

- Definition

Disclosure of acquisitions and disposals.

+ References

No definition available.

+ Details

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Namespace Prefix:	rio_
Data Type:	xbrli:stringItemType
Balance Type:	na
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