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FINANCIAL RISK MANAGEMENT - Narrative (Details)
bbl in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
bbl
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about financial instruments [line items]      
Borrowings $ 5,536,000,000 $ 5,738,000,000 $ 6,423,000,000
Debt to total capitalization ratio, actual 0.07    
Commodity price risk      
Disclosure of detailed information about financial instruments [line items]      
Volume of fuel consumed in production process (in barrels) | bbl 4    
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Reasonably possible change in risk variable, percent 1.00%    
Reasonably possible change in risk variable, impact on equity $ 18,000,000 0  
Interest rate risk | Cash and equivalents      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 3,300,000,000    
Interest rate risk | Borrowings | Variable rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 100,000,000    
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 5,536,000,000 6,000,000,000  
Debt net of cash and equivalents 2,000,000,000 $ 4,000,000,000  
Undrawn borrowing facilities $ 3,000,000,000    
Required ratio of debt to total capitalization 0.60