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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) lb oz $ / lb $ / lb $ / oz | Mar. 31, 2019 USD ($) $ / lb $ / lb $ / oz | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 95 | $ 95 |  | $ 23
Derivative Liability, Fair Value, Gross Liability | 15 | 15 |  | 48
Derivative Asset, Fair Value, Gross Liability | 2 | 2 |  | 7
Derivative Liability, Fair Value, Gross Asset | 2 | 2 |  | 7
Derivative Asset | 93 | 93 |  | 16
Derivative Liability | 13 | 13 |  | 41
Trade accounts receivable [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 70 | 70 |  | 3
Derivative Liability | 0 | 0 |  | 24
Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 9 | 9 |  | 0
Derivative Liability | 0 | 0 |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset | 14 | 14 |  | 13
Derivative Liability | 13 | 13 |  | 17
Commodity Contract [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | 2 | $ 2 |
Derivative Asset, Fair Value, Gross Asset | 10 | 10 |  | 0
Derivative Liability, Fair Value, Gross Liability | 1 | 1 |  | 9
Derivative Asset, Fair Value, Gross Liability | 1 | 1 |  | 0
Derivative Liability, Fair Value, Gross Asset | 1 | 1 |  | 0
Derivative Asset | 9 | 9 |  | 0
Derivative Liability | 0 | 0 |  | 9
Embedded Derivative Financial Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 85 | 85 |  | 23
Derivative Liability, Fair Value, Gross Liability | 14 | 14 |  | 39
Derivative Asset, Fair Value, Gross Liability | 1 | 1 |  | 7
Derivative Liability, Fair Value, Gross Asset | 1 | 1 |  | 7
Derivative Asset | 84 | 84 |  | 16
Derivative Liability | 13 | 13 |  | 32
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 9 | $ 9 |  | 0
Derivative, Nonmonetary Notional Amount, Mass | lb | 66 |  |  |
Derivative, Average Forward Price | $ / lb | 2.81 | 2.81 |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 85 | $ 85 |  | 23
Derivative Liability, Fair Value, Gross Liability | $ 14 | $ 14 |  | 39
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 11 |  |  |
Derivative, Average Forward Price | $ / lb | 2.92 | 2.92 |  |
Future [Member] | Not Designated as Hedging Instrument [Member] | FMC's Copper Futures and Swap Contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 0 |  | 9
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 1 | 1 |  | 0
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Other Current Assets |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 1 | $ 1 |  | $ 0
Copper | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Average Market Price | $ / lb | 2.94 | 2.94 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 613 |  |  |
Derivative, Average Forward Price | $ / lb | 2.83 | 2.83 |  |
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Average Market Price | $ / lb | 2.94 | 2.94 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 100 |  |  |
Derivative, Average Forward Price | $ / lb | 2.81 | 2.81 |  |
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Average Market Price | $ / oz | 1,296 | 1,296 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 131 |  |  |
Derivative, Average Forward Price | $ / oz | 1,300 | 1,300 |  |
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 120 | (117) |
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | 122 | (135) |
Sales [Member] | gold and other [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | (2) | 18 |
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 1 | $ 2 |

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