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Acquisitions and disposals - Additional information (Detail) - USD ($) $ in Millions | 6 Months Ended
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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

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- 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

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- 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
Period Type: | duration