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RETIREMENT BENEFIT OBLIGATIONS (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
country
item
Dec. 31, 2020
USD ($)
Disclosure of defined benefit plans [line items]    
Amount recognised on the balance sheet - liability $ (127) $ (163)
Amount recognised on the balance sheet - asset 182 133
Unfunded plans    
Disclosure of defined benefit plans [line items]    
Unfunded $ 55 (30)
Pension plans    
Disclosure of defined benefit plans [line items]    
Number of countries | country 14  
Number of major defined benefit plans | item 2  
Pension plans | Minimum    
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 | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded $ 159 79
Pension plans | United Kingdom | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded 137 82
Pension plans | United States of America | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded 40 47
Pension plans | Other Countries | Funded plans    
Disclosure of defined benefit plans [line items]    
Funded (18) (50)
Pension plans | Other Countries | Unfunded plans    
Disclosure of defined benefit plans [line items]    
Unfunded (91) (94)
Retirement Healthcare | Unfunded plans    
Disclosure of defined benefit plans [line items]    
Unfunded $ (13) $ (15)