XML 171 R89.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments $ 191 $ 229
Unearned interest income (10) (16)
Present value 181 213
Provision (57) (65)
Net book value 124 148
Not later than one year [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 51 64
Unearned interest income (4) (5)
Present value 47 59
Provision (1) (2)
Net book value 46 57
Between one and five years [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 94 117
Unearned interest income (5) (9)
Present value 89 108
Provision (23) (28)
Net book value 66 80
Later than five years [member]    
Disclosure of maturity analysis of finance lease payments receivable [line items]    
Total future payments 46 48
Unearned interest income (1) (2)
Present value 45 46
Provision (33) (35)
Net book value $ 12 $ 11