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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 lb oz $ / lb $ / lb $ / oz | Mar. 31, 2017 USD ($) $ / lb $ / lb $ / oz | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commodity Contract [Member] |  |  |  |
Unrealized gains (losses): |  |  |  |
Derivative financial instruments | $ |  | $ (2) | $ 7 |
Hedged item – firm sales commitments | $ |  | 2 | (7) |
Realized gains (losses): |  |  |  |
Matured derivative financial instruments | $ |  | $ 8 | (4) |
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 48 |  |  |
Derivative, Average Forward Price | 2.56 | 2.56 |  |
Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Sales [Member] |  |  |  |
Realized gains (losses): |  |  |  |
Matured derivative financial instruments | $ |  | $ 126 | $ 72 |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 8 |  |  |
Derivative, Average Forward Price | 2.64 | 2.64 |  |
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Amounts recorded in Cost of Sales |  |  |  |
Realized gains (losses): |  |  |  |
Matured derivative financial instruments | $ |  | $ (1) |  | $ 7
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 | 443 |  |  |
Derivative, Average Forward Price | 2.61 | 2.61 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | 2.64 | 2.64 |  |
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 | 2.64 | 2.64 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | 2.65 | 2.65 |  |
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 | 50 |  |  |
Derivative, Average Forward Price | $ / oz | 1,222 | 1,222 |  |
Realized gains (losses): |  |  |  |
Derivative Average Market Price | $ / oz | 1,246 | 1,246 |  |

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