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Group statement of changes in equity (Parenthetical) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Share buy back	[1]		$ 1
Payments for entity's shares		$ 0	208
Retained earnings
Share buy back	[1]		$ 1
[1] In 2020, the amount of US$1 million together with the amounts paid during the period in respect of an irrevocable contract in place at the beginning of the year to cover the share buy-back programme totalled US$208 million as reported in the cash flow statement.

X

- Definition

The cash outflow to acquire or redeem entity's shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_17_b&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

Purchase of entity shares pursuant to share buy back.

+ References

No definition available.

+ Details

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Namespace Prefix:	rio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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