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Group statement of changes in equity (Parenthetical) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Dec. 31, 2018
Share buy back	$ (1)	$ 1,133	[1]
Payments for entity's shares	208	988		$ 988
Retained earnings
Share buy back	$ 1	$ 1,133	[1]
[1] Total amount of US$1,133 million includes own shares purchased from owners of Rio Tinto plc as per the cash flow statement of US$988 million adjusted for the movement in a financial liability recognised in respect of irrevocable contracts in place as at 30 June 2019 and 31 December 2018 to cover the share buy-back programme.

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 2019-01-01
-Paragraph 17
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_b&doctype=Standard
-URIDate 2019-03-27

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- 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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