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RETIREMENT BENEFIT OBLIGATIONS (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
country
item
Dec. 31, 2017
USD ($)
Disclosure of defined benefit plans [line items]    
Funded $ 56 $ 16
Unfunded (22) (69)
Amount recognised on the balance sheet – liability (114) (131)
Amount recognised on the balance sheet – asset $ 92 62
Pension plans    
Disclosure of defined benefit plans [line items]    
Number of countries | country 14  
Number of major defined benefit plans | item 2  
Pension plans | Minimium    
Disclosure of defined benefit plans [line items]    
Retirement benefits as a percentage of final salary 1.30%  
Minimum funding requirement period 7 years  
Pension plans | Maximum    
Disclosure of defined benefit plans [line items]    
Retirement benefits as a percentage of final salary 66.70%  
Pension plans | United Kingdom | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded $ 77 53
Pension plans | United States of America | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded 13 9
Pension plans | Other | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded (34) (46)
Pension plans | Other | Unfunded plans    
Disclosure of defined benefit plans [line items]    
Unfunded (60) (60)
Retirement Healthcare | Unfunded plans    
Disclosure of defined benefit plans [line items]    
Unfunded $ (18) $ (25)