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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2019 lb oz $ / lb $ / lb $ / oz | Mar. 31, 2019 USD ($) $ / lb $ / lb $ / oz | Mar. 31, 2018 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |
Realized gains (losses): |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ 120 | $ (117)
Commodity Contract [Member] |  |  |
Unrealized gains (losses): |  |  |
Derivative financial instruments | $ |  | 18 | (15)
Hedged item – firm sales commitments | $ |  | (18) | 15
Realized gains (losses): |  |  |
Matured derivative financial instruments | $ |  | $ 2 | 2
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 66 |  |
Derivative, Average Forward Price | 2.81 | 2.81 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 11 |  |
Derivative, Average Forward Price | 2.92 | 2.92 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |  |
Realized gains (losses): |  |  |
Matured derivative financial instruments | $ |  | $ 1 | 2
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |
Realized gains (losses): |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ 122 | (135)
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 | 613 |  |
Derivative, Average Forward Price | 2.83 | 2.83 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 2.94 | 2.94 |
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 | 100 |  |
Derivative, Average Forward Price | 2.81 | 2.81 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 2.94 | 2.94 |
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 | 131 |  |
Derivative, Average Forward Price | $ / oz | 1,300 | 1,300 |
Realized gains (losses): |  |  |
Derivative Average Market Price | $ / oz | 1,296 | 1,296 |
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 | $ |  | $ (2) | $ 18
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 | 3 |  |
Derivative, Average Forward Price | 14.98 | 14.98 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 9.24 | 9.24 |

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