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Trade and other receivables - Summary of Movement in Allowance for Expected Lifetime Credit Losses of Trade and Other Receivables (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Trade and other receivables [abstract]    
At 1 January $ (120) $ (106)
Impairment loss (20) (16)
System Fund impairment loss (19) (9)
Amounts written off 13 8
Exchange and other adjustments (4) 3
At 31 December $ (150) $ (120)