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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) 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 ($) | Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 81 | $ 81 |  | $ 81 |  | $ 146
Derivative Liability, Fair Value, Gross Liability | 48 | 48 |  | 48 |  | 58
Derivative Asset, Fair Value, Gross Liability | 3 | 3 |  | 3 |  | 14
Derivative Liability, Fair Value, Gross Asset | 3 | 3 |  | 3 |  | 14
Derivative Asset | 78 | 78 |  | 78 |  | 132
Derivative Liability | 45 | 45 |  | 45 |  | 44
Trade accounts receivable [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset | 69 | 69 |  | 69 |  | 119
Derivative Liability | 24 | 24 |  | 24 |  | 13
Other Current Assets |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset | 5 | 5 |  | 5 |  | 7
Derivative Liability | 0 | 0 |  | 0 |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset | 4 | 4 |  | 4 |  | 6
Derivative Liability | 21 | 21 |  | 21 |  | 31
Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 12 | $ 0 | 21 | $ (8) |
Derivative Asset, Fair Value, Gross Asset | 7 | 7 |  | 7 |  | 9
Derivative Liability, Fair Value, Gross Liability | 2 | 2 |  | 2 |  | 2
Derivative Asset, Fair Value, Gross Liability | 2 | 2 |  | 2 |  | 2
Derivative Liability, Fair Value, Gross Asset | 2 | 2 |  | 2 |  | 2
Derivative Asset | 5 | 5 |  | 5 |  | 7
Derivative Liability | 0 | 0 |  | 0 |  | 0
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 74 | 74 |  | 74 |  | 137
Derivative Liability, Fair Value, Gross Liability | 46 | 46 |  | 46 |  | 56
Derivative Asset, Fair Value, Gross Liability | 1 | 1 |  | 1 |  | 12
Derivative Liability, Fair Value, Gross Asset | 1 | 1 |  | 1 |  | 12
Derivative Asset | 73 | 73 |  | 73 |  | 125
Derivative Liability | 45 | 45 |  | 45 |  | 44
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 7 | $ 7 |  | $ 7 |  | 9
Derivative, Nonmonetary Notional Amount, Mass | lb | 46 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.83 | 2.83 |  | 2.83 |  |
Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 74 | $ 74 |  | $ 74 |  | 137
Derivative Liability, Fair Value, Gross Liability | $ 46 | $ 46 |  | $ 46 |  | 56
Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 5 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.95 | 2.95 |  | 2.95 |  |
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 48 | $ 48 |  | $ 48 |  | 58
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | FMC's Copper Futures and Swap Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 2 | $ 2 |  | $ 2 |  | $ 2
Copper | Short [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / lb | 2.93 | 2.93 |  | 2.93 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 546 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.84 | 2.84 |  | 2.84 |  |
Copper | Long [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / lb | 2.93 | 2.93 |  | 2.93 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 155 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.83 | 2.83 |  | 2.83 |  |
Gold | Short [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,287 | 1,287 |  | 1,287 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 194 |  |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,318 | 1,318 |  | 1,318 |  |
Sales [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 137 | 12 | $ 297 | 88 |
Cost of Sales [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ (9) | $ (1) | $ (14) | $ 4 |

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