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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

X

- 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

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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

X

- 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