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FINANCIAL LIABILITIES - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Deferred consideration, annual interest accrual 3.35%  
Dividends recognised as distributions to owners $ 66  
Exchangeable and class B shares(2)    
Disclosure of detailed information about financial instruments [line items]    
Exchangeable share conversion, value $ 55  
Exchangeable shares outstanding (Shares)    
Disclosure of detailed information about financial instruments [line items]    
Exchangeable share conversion (in shares) 1,388,874  
Combined share capital    
Disclosure of detailed information about financial instruments [line items]    
Number of share issued (in dollars per share) $ 38.09  
Number of share issued, opening (in dollar per share) $ 49.40 $ 0