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Dividends and other reserves - Narrative (Details) - GBP (£) £ / shares in Units, £ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 25, 2023 | Dec. 31, 2021 | Dec. 31, 2022 | Jun. 30, 2022
Disclosure of reserves within equity [line items] |  |  |  |
Interim dividend per share (in GBP per share) |  | £ 0.2936 |  |
Other reserves |  | £ 1,551 | £ 2,193 | £ 2,174
Capital redemption reserve |  | 3,206 | 3,224 |
Hedging reserve surplus |  | 61 | 96 |
Exchange reserve deficit |  | (1,716) | (1,127) |
Reserve of change in value of foreign currency basis spreads |  | £ 22 | £ 22 |
Major ordinary share transactions |  |  |  |
Disclosure of reserves within equity [line items] |  |  |  |
Interim dividend per share (in GBP per share) | £ 0.3083 |  |  |

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- Definition A component of equity representing the reserve for the redemption of the entity's own shares. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 137 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_137_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition A component of equity representing reserves within equity, not including retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition A component of equity representing the accumulated portion of gain (loss) on a hedging instrument that is determined to be an effective hedge for cash flow hedges. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2022-03-24 -Paragraph 6.5.11 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2022-en-r&anchor=para_6.5.11&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition A component of equity representing the accumulated change in the value of foreign currency basis spreads of financial instruments when excluding them from the designation of these financial instruments as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 9 -IssueDate 2022-03-24 -Paragraph 6.5.16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2022-en-r&anchor=para_6.5.16&doctype=Standard -URIDate 2022-03-24 + Details
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