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FINANCIAL INSTRUMENTS (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 lb oz $ / lb $ / lb $ / oz | Dec. 31, 2019 USD ($) $ / lb $ / lb $ / oz | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 54 | $ (317) | $ 515
Commodity Contract [Member] |  |  |  |
Unrealized gains (losses): |  |  |  |
Derivative financial instruments |  | 15 | (20) | 4
Hedged item – firm sales commitments |  | (15) | 20 | (4)
Realized gains (losses): |  |  |  |
Matured derivative financial instruments |  | $ (8) | (22) | 30
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 54 |  |  |
Derivative, Average Forward Price | $ / lb | 2.69 | 2.69 |  |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 30 |  |  |
Derivative, Average Forward Price | $ / lb | 2.75 | 2.75 |  |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Cost of Sales |  |  |  |
Realized gains (losses): |  |  |  |
Matured derivative financial instruments |  | $ (7) | 18 | (15)
Copper | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 34 | (310) | 489
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 481 |  |  |
Derivative, Average Forward Price | $ / lb | 2.67 | 2.67 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | $ / lb | 2.80 | 2.80 |  |
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 129 |  |  |
Derivative, Average Forward Price | $ / lb | 2.64 | 2.64 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | $ / lb | 2.80 | 2.80 |  |
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 112 |  |  |
Derivative, Average Forward Price | $ / oz | 1,471 | 1,471 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | $ / oz | 1,527 | 1,527 |  |
gold and other [Member] | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 20 | $ (7) | $ 26

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