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Revenue - Summary of Changes in Deferred Revenue (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of changes in contact liabilities [line items]    
Deferred revenue beginning balance $ 2,060 $ 1,848
Increase in deferred revenue 913 907
Recognised as revenue (809) (691)
Exchange and other adjustments 5 (4)
Deferred revenue ending balance 2,169 2,060
Analysed as:    
Current 829 766
Non-current 1,340 1,294
Deferred revenue ending balance 2,169 2,060
Loyalty programme    
Disclosure of changes in contact liabilities [line items]    
Deferred revenue beginning balance 1,653 1,529
Increase in deferred revenue 784 726
Recognised as revenue (710) (602)
Exchange and other adjustments 0 0
Deferred revenue ending balance 1,727 1,653
Analysed as:    
Current 715 661
Non-current 1,012 992
Deferred revenue ending balance 1,727 1,653
Other co-brand fees    
Disclosure of changes in contact liabilities [line items]    
Deferred revenue beginning balance 111 22
Increase in deferred revenue 36 97
Recognised as revenue (12) (8)
Exchange and other adjustments 0 0
Deferred revenue ending balance 135 111
Analysed as:    
Current 13 12
Non-current 122 99
Deferred revenue ending balance 135 111
Application & re-licensing fees    
Disclosure of changes in contact liabilities [line items]    
Deferred revenue beginning balance 171 171
Increase in deferred revenue 24 23
Recognised as revenue (22) (23)
Exchange and other adjustments 0 0
Deferred revenue ending balance 173 171
Analysed as:    
Current 22 23
Non-current 151 148
Deferred revenue ending balance 173 171
Other    
Disclosure of changes in contact liabilities [line items]    
Deferred revenue beginning balance 125 126
Increase in deferred revenue 69 61
Recognised as revenue (65) (58)
Exchange and other adjustments 5 (4)
Deferred revenue ending balance 134 125
Analysed as:    
Current 79 70
Non-current 55 55
Deferred revenue ending balance $ 134 $ 125