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Post employment benefits - Narrative (Details) € in Millions, £ in Millions, $ in Millions | 12 Months Ended |  |  |  |
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Jun. 30, 2024 GBP (£) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 GBP (£) | Jun. 30, 2022 GBP (£) | Jun. 30, 2021 GBP (£) | Dec. 31, 2030 GBP (£) | Dec. 31, 2030 EUR (€) | Dec. 31, 2027 GBP (£) | Dec. 31, 2027 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Jun. 30, 2023 EUR (€)
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Defined contribution plans |  |  | £ 44 | £ 33 | £ 25 |  |  |  |  |  |  |
Cash contributions to plans on next year | £ 75 | $ 95 |  |  |  |  |  |  |  |  |  |
Inventories |  |  | £ 7,661 | £ 7,094 |  |  |  |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  |  | 97.00% | 100.00% |  |  |  |  |  |  |  | 97.00%
Hedging instrument, inflation rate |  |  | 98.00% | 103.00% |  |  |  |  |  |  |  | 98.00%
Percentage of UK plans of total plan liabilities |  |  | 65.00% |  |  |  |  |  |  |  |  | 65.00%
Inventories |  |  | £ 732 | £ 561 |  |  |  |  |  |  |  |
One-off deficit contribution |  |  | £ 16 |  |  |  |  |  |  |  |  |
United Kingdom | Contingent liability arising from post-employment benefit obligations | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash contributions to plans on next year |  |  |  |  |  | £ 430 |  |  |  |  |  |
Ireland |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Hedging instrument, interest rate |  |  | 92.00% | 70.00% |  |  |  |  |  |  |  | 92.00%
Hedging instrument, inflation rate |  |  | 112.00% | 76.00% |  |  |  |  |  |  |  | 112.00%
Ireland | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent asset granted |  |  | £ 171 |  |  |  |  |  |  |  |  | € 200
Ireland | Contingent liability arising from post-employment benefit obligations | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |  |  |  |  |  |  |  |
Cash contributions to plans on next year |  |  |  |  |  | £ 33 | € 39 | £ 33 | € 39 | £ 30 | € 35 |

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