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Financial instruments and risk management - Results of hedge relationships - Narrative (Details) - GBP (£) £ in Millions | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Accumulated fair value change on the statement of financial position for fair value hedges that are no longer applicable |  |  | £ (1) | £ (5) |
Borrowings |  |  | 16,020 | 14,727 |
Quoted | Fair value |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Borrowings |  |  | 15,628 | 15,895 |
Cash flow hedges |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 124 | (157) | £ 173
Cash flow hedges | Transaction exposure hedging risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) transferred out of other comprehensive income to other operating expenses |  |  | (42) | (10) | (42)
Notional amounts |  |  | 1,874 | 1,303 |
Cash flow hedges | Foreign currency debt risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | 239 | (175) | 75
Notional amounts |  |  | 1,694 | 1,475 |
Loss reported in reserves in respect of hedges of foreign currency borrowing no longer applicable |  |  | 19 | 20 |
Cash flow hedges | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | 234 | 93 |
Cash flow hedges | Forecast |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) to income statement | £ (7) | £ 18 |  |  |
Cash flow hedges | Derivatives | Transaction exposure hedging risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | (130) | 111 |
Gain (loss) transferred out of other comprehensive income to other operating expenses |  |  | (11) | (26) |
Cash flow hedges | Derivatives | Foreign currency debt risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | (6) | (123) |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | 239 | (175) |
Cash flow hedges | Derivatives | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 32 | 39 |
Other comprehensive income (loss) reclassified to operating profit |  |  | 46 | 2 | £ (8)
Fair value hedges | Interest rate risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | £ 4,444 | £ 4,646 |

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