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Financial instruments and risk management - Schedule of effectiveness and impacts of hedging relationships (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | £ (17,500) |  |
Net financial assets (liabilities) at the end of the year | (18,120) | £ (17,500) |
Cash flow hedges |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Consolidated comprehensive income, cash flow hedges | 247 | 124 | £ (157)
Cash flow hedges | Foreign currency debt risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivatives in cash flow hedge (foreign currency debt) | (54) | 239 | (175)
Cash flow hedges | Foreign currency exchange risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Derivatives in cash flow hedge (foreign currency risk) | (13) | (42) | (10)
Fair value hedges |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Fair value hedge hedged item at beginning end of the year | 276 | (65) |
Instruments in fair value hedge relationship at the beginning of the year | (7) | (2) |
Fair value hedge hedged item | 96 | 341 |
Income statement, Instruments in fair value hedge relationship | 2 | (5) |
Fair value hedge hedged item at the end of the year | 372 | 276 | (65)
Instruments in fair value hedge relationship at the end of the year | (5) | (7) | (2)
Derivatives | Net investment hedges | Foreign exchange risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | (1) | 0 |
Income statement, net investment hedge | 0 | 0 |
Consolidated comprehensive income, net investment hedge | 0 | 5 |
Other movements | 1 | (6) |
Net financial assets (liabilities) at the end of the year | 0 | (1) | 0
Derivatives | Cash flow hedges | Foreign currency debt risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | 367 | 154 |
Derivatives in cash flow hedge (foreign currency debt) | (54) | 239 |
Consolidated comprehensive income, cash flow hedges | 60 | (6) |
Other movements | (25) | (20) |
Net financial assets (liabilities) at the end of the year | 348 | 367 | 154
Derivatives | Cash flow hedges | Foreign currency exchange risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | (77) | 53 |
Derivatives in cash flow hedge (foreign currency risk) | (17) | (11) |
Consolidated comprehensive income, cash flow hedges | 260 | (130) |
Other movements | 17 | 11 |
Net financial assets (liabilities) at the end of the year | 183 | (77) | 53
Derivatives | Cash flow hedges | Commodity price risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | 50 | 16 |
Derivatives in cash flow hedge (commodity price risk) | 33 | 46 | 2
Consolidated comprehensive income, cash flow hedges | (89) | 32 |
Other movements | (19) | (44) |
Net financial assets (liabilities) at the end of the year | (25) | 50 | 16
Derivatives | Fair value hedges | Interest rate risk |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Net financial assets (liabilities) at the beginning of the year | (283) | 63 |
Derivatives in fair value hedge (interest rate risk) | (94) | (346) |
Net financial assets (liabilities) at the end of the year | £ (377) | £ (283) | £ 63

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- Definition Accumulated Fair Value Hedge Adjustment On Hedged Item Included In Carrying Amount, Assets (Liabilities) + References No definition available. + Details
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- Definition The gains (losses) on ineffective portion of hedges of net investments in foreign operations, on recycling of foreign exchange previously recognized in other comprehensive income at business disposal and portion of fair value changes of hedging instruments that are excluded from hedge designation recognized in profit or loss. + References No definition available. + Details
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