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FINANCIAL INSTRUMENTS (Unsettled Derivatives) (Details) lb in Millions, bbl in Millions, MMBTU in Millions, $ in Millions |  | 36 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) lb | Dec. 31, 2020 $ / bbl bbl | Dec. 31, 2020 MMBTU $ / bbl bbl | Dec. 31, 2020 $ / MMBTU | Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 146 |  |  |  | $ 20
Derivative Liability, Fair Value, Gross Liability | 58 |  |  |  | 92
Derivative Liability, Fair Value, Gross Asset | 14 |  |  |  | 6
Derivative Asset, Fair Value, Gross Liability | 14 |  |  |  | 6
Derivative Asset | 132 |  |  |  | 14
Derivative Liability | 44 |  |  |  | 86
Trade accounts receivable [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 119 |  |  |  | 9
Derivative Liability | 13 |  |  |  | 51
Other current assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 7 |  |  |  | 0
Derivative Liability | 0 |  |  |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 6 |  |  |  | 5
Derivative Liability | 31 |  |  |  | 35
Commodity Contract [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 9 |  |  |  | 1
Derivative Liability, Fair Value, Gross Liability | 2 |  |  |  | 11
Derivative Liability, Fair Value, Gross Asset | 2 |  |  |  | 1
Derivative Asset, Fair Value, Gross Liability | 2 |  |  |  | 1
Derivative Asset | 7 |  |  |  | 0
Derivative Liability | 0 |  |  |  | 10
Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 137 |  |  |  | 19
Derivative Liability, Fair Value, Gross Liability | 56 |  |  |  | 81
Derivative Liability, Fair Value, Gross Asset | 12 |  |  |  | 5
Derivative Asset, Fair Value, Gross Liability | 12 |  |  |  | 5
Derivative Asset | 125 |  |  |  | 14
Derivative Liability | 44 |  |  |  | 76
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 9 |  |  |  | 1
Derivative Liability, Fair Value, Gross Liability | $ 2 |  |  |  | 11
Derivative, Nonmonetary Notional Amount, Mass | lb | 42 |  |  |  |
Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 137 |  |  |  | 19
Derivative Liability, Fair Value, Gross Liability | $ 56 |  |  |  | $ 81
Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 3 |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Volume | bbl |  | 5.2 | 19.4 |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU |  |  | 28.9 |  |
Derivative, Swap Type, Fixed Price |  | 56.04 | 56.04 | 3.1445 |
Derivative, Average Floor Price | $ / bbl |  | 50.00 | 50.00 |  |
Derivative, Cap Price | $ / bbl |  | 63.69 | 63.69 |  |

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