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Reconciliation of profit for the year to cash flow from operations - Summary of Reconciliation of Profit for the Year to Cash Flow From Operations (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of profit (loss) to net cash flows from operating activities [Line Items]      
Profit for the year $ 759 $ 628 $ 750
Adjustments for:      
Net financial expenses 153 115 87
Foreign exchange gains/(losses) (37) 25 (35)
Remeasurement of contingent purchase consideration 8 4 4
Income tax charge 315 269 260
Operating profit adjustments:      
Impairment loss/(reversal) on financial assets 21 10 (1)
Other net impairment charges 2 0 0
Other operating exceptional items 21 12 (28)
Depreciation and amortisation 67 65 67
Operating profit adjustments 111 87 38
Contract assets deduction in revenue 52 43 37
Share-based payments cost 47 44 36
Other adjustments for non-cash items 93 77 60
System Fund adjustments:      
Depreciation and amortisation 79 80 83
Impairment loss on financial assets 19 9 0
Other impairment charges 0 3 0
Share-based payments cost 25 23 20
Share of losses of associates 2 2 3
System fund adjustments 125 117 106
Working capital and other adjustments:      
Increase in deferred revenue 107 214 123
Increase in trade and other receivables (51) (106) (70)
(Decrease)/increase in trade and other payables (25) (45) 31
Other net adjustments 5 (7) (5)
Working capital and other adjustments 36 56 79
Cash flows relating to operating exceptional items (23) 8 (29)
Contract acquisition costs, net of repayments (179) (237) (101)
Total adjustments 602 521 469
Cash flow from operations 1,361 1,149 1,219
Share of profits of associates and joint ventures (before exceptional items)      
Operating profit adjustments:      
Share of profits of associates and joint ventures (before exceptional items) $ (6) $ (10) $ (13)