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Intangible assets - Additional Information (Details) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 01, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Other intangible assets |  | £ 737 | £ 850 | £ 1,452
Amortisation and impairment of acquired intangible assets |  | 93 | 728 | 62
Goodwill impairment |  | £ 237 | 63 | 38
Reduction in operating margin due to amount recovered |  | 2.00% |  |
Imapirment charges due to amount recovered |  | £ 70 |  |
Accumulated impairment losses |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment |  | 237 | 63 | 38
AKQA Group |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Other intangible assets |  | £ 491 |  |
Management forecasts for a projection period |  | five years |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | £ 158 |  |
Goodwill impairment |  | 237 |  |
Global Integrated Agencies |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | 158 | 40 | 0
Public Relations |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | 12 | 0 | 4
Specialist Agencies |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | £ 67 | £ 23 | 34
First Step |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Assumed annual long-term growth rate |  | 0.00% | 0.00% |
Discount rate applied to cash flow projections |  | 13.30% | 14.70% |
Range of Pre-tax Discount Rates for Global Cash Generating Units |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Discount rate applied to cash flow projections |  | 12.30% | 13.70% |
Range of Pre-tax Discount Rates for Geographic Regions |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Discount rate applied to cash flow projections |  | 1.00% |  |
Range of Pre-tax Discount Rates for Geographic Regions | Bottom of Range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Discount rate applied to cash flow projections |  | 11.50% | 12.60% |
Range of Pre-tax Discount Rates for Geographic Regions | Top of Range |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Discount rate applied to cash flow projections |  | 18.40% | 28.40% |
Second Step |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Assumed annual long-term growth rate |  | 2.00% | 2.00% |
Management forecasts for a projection period |  | five years |  |
FVLCD of AKQA Group | AKQA Group |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Discount rate applied to cash flow projections |  | 10.50% |  |
Brand names |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Other intangible assets |  | £ 83 | £ 135 |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | 21 | 650 | £ 1
C&W Brands |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Amortisation and impairment of acquired intangible assets | £ 20 |  |  |
Customer-related intangibles |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Other intangible assets |  | 50 | 108 |
Other acquired intangible assets |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Other intangible assets |  | £ 83 | £ 101 |

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