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Dividends and other reserves - Schedule of dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |  |
Final dividend for the year ended 30 June 2023 of 59.98 cents per share (2022 - 52.71 cents)(1) | $ 1,349 | $ 1,200 |  |
Final dividend per share (in USD per share) |  |  | $ 0.5998 | $ 0.5271

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- Definition The amount, per share, of final dividends as distribution to owners. + References No definition available. + Details
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- Definition Share Capital, Reserves And Other Equity Interest [Abstract] + References No definition available. + Details
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- Definition The amount of dividends relating to prior years, recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
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