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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 lb $ / lb | Sep. 30, 2020 USD ($) $ / oz $ / lb $ / lb | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) lb oz $ / oz $ / lb $ / lb | Sep. 30, 2019 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 109 | $ (51) | $ 57 | $ (40)
Commodity Contract [Member] |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments |  | 1 | (2) | 8 | 3
Hedged item – firm sales commitments |  | (1) | 2 | (8) | (3)
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ 15 | (8) | $ (1) | (9)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 50 |
Derivative, Average Forward Price | $ / lb |  | 2.76 |  | 2.76 |
Copper Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 150 |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.34 |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  |  |  | $ 24 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 26 |
Derivative, Average Forward Price | $ / lb |  | 3.05 |  | 3.05 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ (7) | 0 | $ 12 | (3)
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 94 | (57) | $ 18 | (57)
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 381 |
Derivative, Average Forward Price | $ / lb |  | 2.91 |  | 2.91 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 3.03 |  | 3.03 |
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 113 |
Derivative, Average Forward Price | $ / lb |  | 2.95 |  | 2.95 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 3.03 |  | 3.03 |
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  |  |  | 116 |
Derivative, Average Forward Price | $ / oz |  | 1,941 |  | 1,941 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz |  | 1,891 |  | 1,891 |
gold and other | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 15 | $ 6 | $ 39 | $ 17

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