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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 lb oz $ / lb $ / lb $ / oz | Jun. 30, 2017 USD ($) $ / lb $ / lb $ / oz | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) $ / lb $ / lb $ / oz | Jun. 30, 2016 USD ($)
Commodity Contract [Member] |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments | $ |  | $ 1 | $ 3 | $ (1) | $ 10
Hedged item – firm sales commitments | $ |  | (1) | (3) | 1 | (10)
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ 1 | (4) | $ 9 | (8)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 49 |  |  |  |
Derivative, Average Forward Price | 2.59 | 2.59 |  | 2.59 |
Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ 34 | 4 | $ 160 | 76
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 33 |  |  |  |
Derivative, Average Forward Price | 2.57 | 2.57 |  | 2.57 |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Cost of Sales |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments | $ |  | $ (4) | $ (2) | $ (5) | $ 5
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 | 560 |  |  |  |
Derivative, Average Forward Price | 2.58 | 2.58 |  | 2.58 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.69 | 2.69 |  | 2.69 |
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 | 109 |  |  |  |
Derivative, Average Forward Price | 2.60 | 2.60 |  | 2.60 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | 2.69 | 2.69 |  | 2.69 |
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 | 165 |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,259 | 1,259 |  | 1,259 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,245 | 1,245 |  | 1,245 |

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