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Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments $ 120 $ 191
Unearned interest income (6) (10)
Present value 114 181
Provision (46) (57)
Net book value 68 124
Not later than one year [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 33 51
Unearned interest income (3) (4)
Present value 30 47
Provision (1) (1)
Net book value 29 46
Between one and five years [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 55 94
Unearned interest income (3) (5)
Present value 52 89
Provision (18) (23)
Net book value 34 66
Later than five years [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 32 46
Unearned interest income 0 (1)
Present value 32 45
Provision (27) (33)
Net book value $ 5 $ 12