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Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments $ 82 $ 78
Unearned interest income (5) (4)
Present value 77 74
Provision (12) (11)
Net book value 65 63
Not later than one year    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 30 28
Unearned interest income (3) (2)
Present value 27 26
Provision 0 (1)
Net book value 27 25
Between one and five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 51 49
Unearned interest income (2) (2)
Present value 49 47
Provision (12) (10)
Net book value 37 37
Later than five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 1 1
Unearned interest income 0 0
Present value 1 1
Provision 0 0
Net book value $ 1 $ 1