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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, 2017 USD ($) lb | Dec. 31, 2020 $ / bbl bbl | Dec. 31, 2020 MMBTU $ / bbl bbl | Dec. 31, 2020 $ / MMBTU | Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 167 |  |  |  | $ 146
Derivative Liability, Fair Value, Gross Liability | 33 |  |  |  | 58
Derivative Liability, Fair Value, Gross Asset | 1 |  |  |  | 14
Derivative Asset, Fair Value, Gross Liability | 1 |  |  |  | 14
Derivative Asset | 166 |  |  |  | 132
Derivative Liability | 32 |  |  |  | 44
Trade accounts receivable [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 151 |  |  |  | 119
Derivative Liability | 0 |  |  |  | 13
Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 11 |  |  |  | 7
Derivative Liability | 0 |  |  |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset | 4 |  |  |  | 6
Derivative Liability | 32 |  |  |  | 31
Commodity Contract [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 12 |  |  |  | 9
Derivative Liability, Fair Value, Gross Liability | 2 |  |  |  | 2
Derivative Liability, Fair Value, Gross Asset | 1 |  |  |  | 2
Derivative Asset, Fair Value, Gross Liability | 1 |  |  |  | 2
Derivative Asset | 11 |  |  |  | 7
Derivative Liability | 1 |  |  |  | 0
Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 155 |  |  |  | 137
Derivative Liability, Fair Value, Gross Liability | 31 |  |  |  | 56
Derivative Liability, Fair Value, Gross Asset | 0 |  |  |  | 12
Derivative Asset, Fair Value, Gross Liability | 0 |  |  |  | 12
Derivative Asset | 155 |  |  |  | 125
Derivative Liability | 31 |  |  |  | 44
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 11 |  |  |  | 9
Derivative, Nonmonetary Notional Amount, Mass | lb | 41 |  |  |  |
Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 155 |  |  |  | 137
Derivative Liability, Fair Value, Gross Liability | $ 31 |  |  |  | 56
Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 4 |  |  |  |
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 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 24 |  |  |  |
Future [Member] | Derivatives Not Designated as Hedging Instruments [Member] | FMC's Copper Futures and Swap Contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  |  | 2
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 33 |  |  |  | 58
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 2 |  |  |  | 0
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Current Assets [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 1 |  |  |  | $ 0

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