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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, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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Accumulated fair value change on the statement of financial position for fair value hedges that are no longer applicable |  |  | £ 0 | £ (1) |
Cash flow hedges |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 247 | 124 | £ (157)
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 |  |  | (13) | (42) | (10)
Notional amounts |  |  | 1,734 | 1,874 |
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 |  |  | (54) | 239 | (175)
Notional amounts |  |  | 873 | 1,694 |
Loss reported in reserves in respect of hedges of foreign currency borrowing no longer applicable |  |  | 18 | 19 |
Cash flow hedges | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | 217 | 234 |
Cash flow hedges | Forecast |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) to income statement | £ 20 | £ 143 |  |  |
Cash flow hedges | Derivatives | Transaction exposure hedging risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 260 | (130) |
Gain (loss) transferred out of other comprehensive income to other operating expenses |  |  | (17) | (11) |
Cash flow hedges | Derivatives | Foreign currency debt risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | 60 | (6) |
Gain (loss) transferred out of other comprehensive income to other finance charges |  |  | (54) | 239 |
Cash flow hedges | Derivatives | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Gain (loss) on cash flow hedge instruments |  |  | (89) | 32 |
Other comprehensive income (loss) reclassified to operating profit |  |  | 33 | 46 | £ 2
Fair value hedges | Interest rate risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amounts |  |  | £ 3,999 | £ 4,444 |

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- Definition The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial liability measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial liabilities at amortised cost; Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24B -Subparagraph a -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24B_a_v&doctype=Standard -URIDate 2022-03-24 + Details
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