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Segmental information - Summary of Information by Reportable Segment - Result (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reportable segments [line items]      
Total revenue $ 5,189 $ 4,923 $ 4,624
Operating exceptional items 1,198 1,041 1,066
Net financial expenses (153) (115) (87)
Foreign exchange gains/(losses) 37 (25) [1] 35 [1]
Remeasurement of contingent purchase consideration (8) (4) (4)
Profit before tax 1,074 897 1,010
Tax (315) (269) (260)
Profit for the year 759 628 750
Operating segments      
Disclosure of reportable segments [line items]      
Total revenue 2,468 2,312 2,164
Operating segments | Before exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items 1,265 1,124 1,019
Unallocated amounts      
Disclosure of reportable segments [line items]      
Total revenue 2,721 2,611 2,460
Material reconciling items | Exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items (21) 0 28
Material reconciling items | System Fund and reimbursable result | Exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items (46) (83) 19
Americas | Exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items (2) 4 27
Americas | Operating segments      
Disclosure of reportable segments [line items]      
Total revenue 1,129 1,141 1,105
Americas | Operating segments | Before exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items 836 828 815
EMEAA | Exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items (13) (4) 1
EMEAA | Operating segments      
Disclosure of reportable segments [line items]      
Total revenue 811 748 677
EMEAA | Operating segments | Before exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items 303 270 215
Greater China | Operating segments      
Disclosure of reportable segments [line items]      
Total revenue 165 161 161
Greater China | Operating segments | Before exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items 99 98 96
Central | Exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items (6) 0 0
Central | Operating segments      
Disclosure of reportable segments [line items]      
Total revenue 363 262 221
Central | Operating segments | Before exceptional items      
Disclosure of reportable segments [line items]      
Operating exceptional items $ 27 $ (72) $ (107)
[1] In 2025, foreign exchange gains/(losses) have been presented on a separate line. The 2024 and 2023 amounts were previously presented within
‘Financial expenses’.