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ACCOUNTS PAYABLE AND OTHER (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current:    
Accounts payable $ 84 $ 90
Accrued & other liabilities 265 256
Deferred revenue(1) 156 141
Total current 505 487
Non-current:    
Deferred revenue(1) 76 65
Provisions & other liabilities 20 25
Total non-current $ 96 $ 90
2021    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Percentage of entity's deferred income recognized 68.00%  
Percentage of entity's deferred income recognized 68.00%  
2022    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Percentage of entity's deferred income recognized 5.00%  
Percentage of entity's deferred income recognized 5.00%  
2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Percentage of entity's deferred income recognized 5.00%  
Percentage of entity's deferred income recognized 5.00%  
Later than three years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Percentage of entity's deferred income recognized 22.00%  
Percentage of entity's deferred income recognized 22.00%