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FINANCIAL INSTRUMENTS (Unsettled Derivatives) (Details) lb in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2020 lb | Dec. 31, 2020 USD ($) lb | Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 184 | $ 74
Derivative Liability, Fair Value, Gross Liability |  | 21 | 21
Derivative Liability, Fair Value, Gross Asset |  | 1 | 0
Derivative Asset, Fair Value, Gross Liability |  | 1 | 0
Derivative Asset |  | 183 | 74
Derivative Liability |  | 20 | 21
Trade accounts receivable [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 168 | 66
Derivative Liability |  | 0 | 0
Other Current Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 15 | 6
Derivative Liability |  | 0 | 0
Accounts Payable and Accrued Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset |  | 0 | 2
Derivative Liability |  | 20 | 21
Commodity Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 15 | 6
Derivative Liability, Fair Value, Gross Liability |  | 0 | 1
Derivative Asset |  | 15 | 6
Derivative Liability |  | 0 | 1
Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 169 | 68
Derivative Liability, Fair Value, Gross Liability |  | 21 | 20
Derivative Liability, Fair Value, Gross Asset |  | 1 | 0
Derivative Asset, Fair Value, Gross Liability |  | 1 | 0
Derivative Asset |  | 168 | 68
Derivative Liability |  | 20 | 20
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 15 | 6
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 50 |
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 150 |  |
Derivatives Not Designated as Hedging Instruments | Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 169 | 68
Derivative Liability, Fair Value, Gross Liability |  | $ 21 | 20
Derivatives Not Designated as Hedging Instruments | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 6 |
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | $ 0 | $ 1

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