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Financial instruments - Schedule of financial assets and liabilities measured at fair value (Details) - GBP (£) £ in Millions | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Valuation techniques based on observable market input (Level 2) |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | £ 682 | £ 480 | £ 381
Derivative liabilities | (552) | (456) | (237)
Financial assets/(liabilities) | 130 | 24 | 144
Valuation techniques based on unobservable market input (Level 3) |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets/(liabilities) | (403) | (403) | (316)
Financial assets - other | 172 | 184 | 167
Financial liabilities - other | £ (575) | £ (587) | £ (483)

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- Definition Financial assets liabilities at fair value. + References No definition available. + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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 of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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 of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_d&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph m -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_m&doctype=Standard -URIDate 2022-03-24 + Details
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