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Tax - Summary of Deferred Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of income tax reconciliation [line items]    
Beginning balance $ 104 $ 66
Group income statement 5 47
Group statement of comprehensive income 14 (16)
Group statement of changes in equity (6) 9
Exchange and other adjustments 12 (2)
Ending balance 129 104
Deferred tax assets liabilities net threshold 10  
Deferred gains on loan notes    
Disclosure of income tax reconciliation [line items]    
Beginning balance (34) (34)
Group income statement 34 0
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 0 0
Ending balance 0 (34)
Associates    
Disclosure of income tax reconciliation [line items]    
Beginning balance (59) (60)
Group income statement 1 1
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 0 0
Ending balance (58) (59)
Losses    
Disclosure of income tax reconciliation [line items]    
Beginning balance 65 76
Group income statement 0 (7)
Group statement of comprehensive income 0 (3)
Group statement of changes in equity 0 0
Exchange and other adjustments 5 (1)
Ending balance 70 65
Deferred compensation and employee benefits    
Disclosure of income tax reconciliation [line items]    
Beginning balance 113 95
Group income statement 8 9
Group statement of comprehensive income 0 0
Group statement of changes in equity (6) 9
Exchange and other adjustments 3 0
Ending balance 118 113
Deferred revenue    
Disclosure of income tax reconciliation [line items]    
Beginning balance 30 0
Group income statement 19 30
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 0 0
Ending balance 49 30
Research and development    
Disclosure of income tax reconciliation [line items]    
Beginning balance 33 15
Group income statement (17) 18
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 0 0
Ending balance 16 33
Other short-term Temporary Difference    
Disclosure of income tax reconciliation [line items]    
Beginning balance (17) 8
Group income statement (26) (11)
Group statement of comprehensive income 14 (13)
Group statement of changes in equity 0 0
Exchange and other adjustments 0 (1)
Ending balance (29) (17)
Deferred tax assets liabilities net threshold 20  
Property, plant, equipment and software    
Disclosure of income tax reconciliation [line items]    
Beginning balance (9) (30)
Group income statement (1) 21
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 2 0
Ending balance (8) (9)
Application fees    
Disclosure of income tax reconciliation [line items]    
Beginning balance 42 42
Group income statement 1 0
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 0 0
Ending balance 43 42
Intangible assets excluding software    
Disclosure of income tax reconciliation [line items]    
Beginning balance (60) (46)
Group income statement (14) (14)
Group statement of comprehensive income 0 0
Group statement of changes in equity 0 0
Exchange and other adjustments 2 0
Ending balance $ (72) $ (60)