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Financial instruments - Carrying amounts and fair values (Detail) - Borrowings excluding overdrafts - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings (including overdrafts), carrying value | $ 11,587 | $ 12,168
Borrowings (including overdrafts), fair value | $ 11,997 | $ 13,904

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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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=rio_BorrowingsExcludingOverdraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |