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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, 2017 lb oz $ / lb $ / lb $ / oz | Sep. 30, 2017 USD ($) $ / lb $ / lb $ / oz | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) $ / lb $ / lb $ / oz | Sep. 30, 2016 USD ($)
Commodity Contract [Member] |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments | $ |  | $ 0 | $ 1 | $ (1) | $ 11
Hedged item – firm sales commitments | $ |  | 0 | (1) | 1 | (11)
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ 12 | 0 | $ 21 | (8)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 46 |  |  |  |
Derivative, Average Forward Price | 2.83 | 2.83 |  | 2.83 |
Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ 137 | 12 | $ 297 | 88
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 5 |  |  |  |
Derivative, Average Forward Price | 2.95 | 2.95 |  | 2.95 |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Cost of Sales |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ (9) | $ (1) | $ (14) | $ 4
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 546 |  |  |  |
Derivative, Average Forward Price | 2.84 | 2.84 |  | 2.84 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.93 | 2.93 |  | 2.93 |
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 155 |  |  |  |
Derivative, Average Forward Price | 2.83 | 2.83 |  | 2.83 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.93 | 2.93 |  | 2.93 |
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 194 |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,318 | 1,318 |  | 1,318 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,287 | 1,287 |  | 1,287 |

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