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Financial instruments disclosures - Carrying Amounts And Fair Values (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Borrowings | $ 12,405 | $ 12,653
Fair Value |  |
Borrowings | $ 14,558 | $ 15,076

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Borrowings at fair value. + References No definition available. + Details
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Namespace Prefix: | rio_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying Value [Abstract] + References No definition available. + Details
Name: | rio_CarryingValueAbstract
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair Value [Abstract] + References No definition available. + Details
Name: | rio_FairValueAbstract
Namespace Prefix: | rio_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration