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Intangible assets - Summary of Cash-generating Units with Significant Goodwill (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | £ 7,610 | £ 8,389 | £ 8,453
Brands with an indefinite useful life | 409 | 412 |
GroupM |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 3,200 | 3,255 |
Brands with an indefinite useful life | 0 | 0 |
VML |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 1,905 | 0 |
Brands with an indefinite useful life | 0 | 0 |
Wunderman Thompson |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 0 | 1,165 |
Brands with an indefinite useful life | 0 | 0 |
VMLY&R |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 0 | 815 |
Brands with an indefinite useful life | 0 | 0 |
Ogilvy |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 795 | 809 |
Brands with an indefinite useful life | 212 | 213 |
BCW |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 0 | 619 |
Brands with an indefinite useful life | 0 | 113 |
Burson |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 746 | 0 |
Brands with an indefinite useful life | 111 | 0 |
Hill & Knowlton |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 0 | 142 |
Brands with an indefinite useful life | 33 | 33 |
AKQA Group |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 435 | 600 |
Brands with an indefinite useful life | 0 | 0 |
FGS Global |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 0 | 452 |
Brands with an indefinite useful life | 0 | 0 |
Landor |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 89 | 115 |
Brands with an indefinite useful life | 53 | 53 |
Other |  |  |
Disclosure of information for cash-generating units [line items] |  |  |
Goodwill | 440 | 417 |
Brands with an indefinite useful life | £ 0 | £ 0 |

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