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Group statement of changes in equity (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share buy-back | [1] | $ 1,135 | $ 5,704 | $ (2,397)
Own shares purchased from owners of Rio Tinto |  | $ 1,552 | $ 5,386 | $ 2,083
[1] | In 2019, the total amount of US$1,135 million (2018: US$5,704 million, 2017: US$2,397 million) includes own shares purchased from the owners of Rio Tinto as per the cash flow statement of US$1,552 million (2018: US$5,386 million, 2017: US$2,083 million) and a financial liability recognised in respect of an irrevocable contract in place as at the reporting date to cover the share buy-back programme, less amounts paid during the year in respect of a similar irrevocable contract in place at the beginning of the year.

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- 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 + Details
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- Definition Purchase of entity shares pursuant to share buy back. + References No definition available. + Details
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