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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 lb oz $ / lb $ / oz $ / lb | Sep. 30, 2019 USD ($) $ / lb $ / oz $ / lb | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) $ / lb $ / oz $ / lb | Sep. 30, 2018 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ (51) | $ (118) | $ (40) | $ (279)
Commodity Contract [Member] |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments | $ |  | (2) | 7 | 3 | (12)
Hedged item – firm sales commitments | $ |  | 2 | (7) | (3) | 12
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ (8) | (19) | $ (9) | (17)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 72 |  |  |  |
Derivative, Average Forward Price | 2.66 | 2.66 |  | 2.66 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 1 |  |  |  |
Derivative, Average Forward Price | 2.65 | 2.65 |  | 2.65 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ 0 | 9 | $ (3) | 17
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ (57) | (93) | $ (57) | (242)
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 | 424 |  |  |  |
Derivative, Average Forward Price | 2.63 | 2.63 |  | 2.63 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.59 | 2.59 |  | 2.59 |
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 | 97 |  |  |  |
Derivative, Average Forward Price | 2.63 | 2.63 |  | 2.63 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.59 | 2.59 |  | 2.59 |
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 | 150 |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,510 | 1,510 |  | 1,510 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,491 | 1,491 |  | 1,491 |
gold and other [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ 6 | $ (25) | $ 17 | $ (37)
Cobalt | 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 | 6 |  |  |  |
Derivative, Average Forward Price | 9.81 | 9.81 |  | 9.81 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 12.18 | 12.18 |  | 12.18 |

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