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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 |  |

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