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Revenue recognition and operating segments - Other segment items included in the consolidated income statement (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 175 £ 118 £ 74
Amortisation and impairment of intangible assets, Tax effect (44) (25) (18)
Amortisation and impairment of intangible assets, Total after tax effect 131 93 56
Operating segments | North America      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 118 59 34
Operating segments | Europe      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 24 29 14
Operating segments | UK & Sub Saharan Africa      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 8   9
Operating segments | Asia & MENAT      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 11 20 7
Operating segments | Pacific      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total 6 4 4
Central and regional overheads      
Disclosure of operating segments      
Amortisation and impairment of intangible assets, Total £ 8 £ 6 £ 6