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Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments $ 63 $ 82
Unearned interest income (4) (5)
Present value 59 77
Provision (8) (12)
Net book value 51 65
Not later than one year    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 25 30
Unearned interest income (2) (3)
Present value 23 27
Provision 0 0
Net book value 23 27
Between one and five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 36 51
Unearned interest income (2) (2)
Present value 34 49
Provision (8) (12)
Net book value 26 37
Later than five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 2 1
Unearned interest income 0 0
Present value 2 1
Provision 0 0
Net book value $ 2 $ 1