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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, 2019 USD ($) lb oz $ / lb $ / oz $ / lb | Sep. 30, 2019 USD ($) $ / lb $ / oz $ / lb | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) $ / lb $ / oz $ / lb | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 6 | $ 6 |  | $ 6 |  | $ 23
Derivative Liability, Fair Value, Gross Liability | 42 | 42 |  | 42 |  | 48
Derivative Asset, Fair Value, Gross Liability | 1 | 1 |  | 1 |  | 7
Derivative Liability, Fair Value, Gross Asset | 1 | 1 |  | 1 |  | 7
Derivative Asset | 5 | 5 |  | 5 |  | 16
Derivative Liability | 41 | 41 |  | 41 |  | 41
Trade accounts receivable [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset | 0 | 0 |  | 0 |  | 3
Derivative Liability | 17 | 17 |  | 17 |  | 24
Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset | 5 | 5 |  | 5 |  | 13
Derivative Liability | 24 | 24 |  | 24 |  | 17
Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | (8) | $ (19) | (9) | $ (17) |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Liability | 6 | 6 |  | 6 |  | 9
Derivative Asset, Fair Value, Gross Liability | 0 | 0 |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Asset | 0 | 0 |  | 0 |  | 0
Derivative Asset | 0 | 0 |  | 0 |  | 0
Derivative Liability | 6 | 6 |  | 6 |  | 9
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 6 | 6 |  | 6 |  | 23
Derivative Liability, Fair Value, Gross Liability | 36 | 36 |  | 36 |  | 39
Derivative Asset, Fair Value, Gross Liability | 1 | 1 |  | 1 |  | 7
Derivative Liability, Fair Value, Gross Asset | 1 | 1 |  | 1 |  | 7
Derivative Asset | 5 | 5 |  | 5 |  | 16
Derivative Liability | 35 | 35 |  | 35 |  | 32
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 0 | $ 0 |  | $ 0 |  | 0
Derivative, Nonmonetary Notional Amount, Mass | lb | 72 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.66 | 2.66 |  | 2.66 |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 6 | $ 6 |  | $ 6 |  | 23
Derivative Liability, Fair Value, Gross Liability | $ 36 | $ 36 |  | $ 36 |  | 39
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 1 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.65 | 2.65 |  | 2.65 |  |
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 | $ 6 | $ 6 |  | $ 6 |  | $ 9
Copper | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / lb | 2.59 | 2.59 |  | 2.59 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 424 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.63 | 2.63 |  | 2.63 |  |
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / lb | 2.59 | 2.59 |  | 2.59 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 97 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.63 | 2.63 |  | 2.63 |  |
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,491 | 1,491 |  | 1,491 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 150 |  |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,510 | 1,510 |  | 1,510 |  |
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ (51) | (118) | $ (40) | (279) |
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | (57) | (93) | (57) | (242) |
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 |  | 6 | (25) | 17 | (37) |
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  | $ 0 | $ 9 | $ (3) | $ 17 |

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