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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) lb oz $ / lb $ / lb $ / oz | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 38 |  | $ 74
Derivative Liability, Fair Value, Gross Liability | 147 |  | 21
Derivative Asset, Fair Value, Gross Liability | 2 |  | 0
Derivative Liability, Fair Value, Gross Asset | 2 |  | 0
Derivative Asset | 36 |  | 74
Derivative Liability | 145 |  | 21
Trade accounts receivable [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | 13 |  | 66
Derivative Liability | 54 |  | 0
Accounts Payable and Accrued Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | 20 |  | 2
Derivative Liability | 91 |  | 21
Other Current Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset | 3 |  | 6
Derivative Liability | 0 |  | 0
Commodity Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | (9) | $ 2 |
Derivative Asset, Fair Value, Gross Asset | 4 |  | 6
Derivative Liability, Fair Value, Gross Liability | 28 |  | 1
Derivative Asset, Fair Value, Gross Liability | 1 |  | 0
Derivative Liability, Fair Value, Gross Asset | 1 |  | 0
Derivative Asset | 3 |  | 6
Derivative Liability | 27 |  | 1
Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 34 |  | 68
Derivative Liability, Fair Value, Gross Liability | 119 |  | 20
Derivative Asset, Fair Value, Gross Liability | 1 |  | 0
Derivative Liability, Fair Value, Gross Asset | 1 |  | 0
Derivative Asset | 33 |  | 68
Derivative Liability | 118 |  | 20
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 4 |  | 6
Derivative, Nonmonetary Notional Amount, Mass | lb | 84 |  |
Derivative, Average Forward Price | $ / lb | 2.56 |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 34 |  | 68
Derivative Liability, Fair Value, Gross Liability | $ 119 |  | 20
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 34 |  |
Derivative, Average Forward Price | $ / lb | 2.35 |  |
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 | $ 28 |  | 0
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 0 |  | $ 1
Copper | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Average Market Price | $ / lb | 2.24 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 333 |  |
Derivative, Average Forward Price | $ / lb | 2.59 |  |
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Average Market Price | $ / lb | 2.24 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 87 |  |
Derivative, Average Forward Price | $ / lb | 2.58 |  |
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Average Market Price | $ / oz | 1,614 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 92 |  |
Derivative, Average Forward Price | $ / oz | 1,601 |  |
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ (231) | 120 |
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | (238) | 122 |
Sales [Member] | gold and other | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | 7 | (2) |
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ 24 | $ 1 |

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