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Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments $ 78 $ 81
Unearned interest income (4) (4)
Present value 74 77
Provision (11) (14)
Net book value 63 63
Not later than one year    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 28 32
Unearned interest income (2) (2)
Present value 26 30
Provision (1) (2)
Net book value 25 28
Between one and five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 49 47
Unearned interest income (2) (2)
Present value 47 45
Provision (10) (12)
Net book value 37 33
Later than five years    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 1 2
Unearned interest income 0 0
Present value 1 2
Provision 0 0
Net book value $ 1 $ 2