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Financial instruments - Narrative (Details) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2024 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Financial liability including put option | £ 436 | £ 388 |  | £ 444 |
Fair value of gross borrowings | 17,609 |  |  | 16,020 |
Level 3 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contingent consideration included in other financial liabilities | 575 | 483 |  | 587 |
Increase (Decrease) in financial assets | (12) | 29 |  |  |
Level 1 | Fair value |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Fair value of gross borrowings | 16,716 |  |  | 15,628 |
Contingent consideration | Level 3 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contingent consideration included in other financial liabilities | £ 358 | £ 314 |  | 371 | £ 429
Business combinations |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contingent consideration payment period | 8 years |  |  |  |
Business combinations | Contingent consideration | Undiscounted amount |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contingent consideration included in other financial liabilities | £ 406 |  |  |  |
Industrias Licoreras de Guatemala |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Equity stake held by external party | 50.00% |  |  |  |
Industrias Licoreras de Guatemala | Level 3 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Financial liability including put option | £ 217 |  |  | £ 216 |
Industrias Licoreras de Guatemala | Option exercised two years later |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase in fair value of liability |  |  | £ 47 |  |

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