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Reconciliation of profit before taxation to headline operating profit - Summary of Reconciliation of Operating (Loss)/Profit to Headline Operating Profit (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Reconciliation Of Profit Before Interest And Taxation To Headline PBIT [Abstract]      
Profit before taxation £ 1,031 £ 346 £ 1,160
Finance and investment income (137) (127) (145)
Finance costs 417 389 359
Revaluation and retranslation of financial instruments 50 (7) (76)
Profit before interest and taxation 1,361 601 1,298
(Earnings)/loss from associates (36) (70) 60
Operating profit 1,325 531 1,358
Goodwill impairment 237 63 38
Amortisation and impairment of acquired intangible assets 93 728 62
Other impairment charges 26 18 77
Restructuring and transformation costs 251 196 219
Property-related restructuring costs 26 232 18
Gains on disposal of investments and subsidiaries (322) (7)  
(Gains)/losses on disposal of investments and subsidiaries     36
Gain on disposal of property (7) 0 0
Other transaction costs 10 0 0
Gains on remeasurement of equity interests arising from a change in scope of ownership 0 0 (66)
Legal provision charges/(gains) 68 (11) 0
Headline operating profit £ 1,707 £ 1,750 £ 1,742