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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended
--- | --- | ---
Mar. 31, 2018 lb oz $ / lb $ / lb $ / oz | Mar. 31, 2018 USD ($) $ / lb $ / lb $ / oz | Mar. 31, 2017 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |
Realized gains (losses): |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ (117) | $ 126
Commodity Contract [Member] |  |  |
Unrealized gains (losses): |  |  |
Derivative financial instruments | $ |  | (15) | (2)
Hedged item – firm sales commitments | $ |  | 15 | 2
Realized gains (losses): |  |  |
Matured derivative financial instruments | $ |  | $ 2 | 8
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 57 |  |
Derivative, Average Forward Price | 3.10 | 3.10 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 3 |  |
Derivative, Average Forward Price | 3.09 | 3.09 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |  |
Realized gains (losses): |  |  |
Matured derivative financial instruments | $ |  | $ 2 | (1)
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |
Realized gains (losses): |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ |  | $ (135) | 107
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 | 518 |  |
Derivative, Average Forward Price | 3.13 | 3.13 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 3.04 | 3.04 |
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 | 104 |  |
Derivative, Average Forward Price | 3.13 | 3.13 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 3.04 | 3.04 |
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 | 311 |  |
Derivative, Average Forward Price | $ / oz | 1,325 | 1,325 |
Realized gains (losses): |  |  |
Derivative Average Market Price | $ / oz | 1,327 | 1,327 |
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 | $ |  | $ 18 | $ 19
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 | 8 |  |
Derivative, Average Forward Price | 30.19 | 30.19 |
Realized gains (losses): |  |  |
Derivative Average Market Price | 33.88 | 33.88 |

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