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Financial Instruments (Unsettled Derivatives) (Details) oz in Thousands, lb in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 lb $ / lb | Jun. 30, 2020 USD ($) lb $ / lb $ / lb $ / oz | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) lb oz $ / lb $ / lb $ / oz | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 94 |  | $ 94 |  | $ 74
Derivative Liability, Fair Value, Gross Liability |  | 34 |  | 34 |  | 21
Derivative Asset, Fair Value, Gross Liability |  | 4 |  | 4 |  | 0
Derivative Liability, Fair Value, Gross Asset |  | 4 |  | 4 |  | 0
Derivative Asset |  | 90 |  | 90 |  | 74
Derivative Liability |  | 30 |  | 30 |  | 21
Trade accounts receivable [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset |  | 76 |  | 76 |  | 66
Derivative Liability |  | 2 |  | 2 |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset |  | 1 |  | 1 |  | 2
Derivative Liability |  | 28 |  | 28 |  | 21
Other Current Assets [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset |  | 13 |  | 13 |  | 6
Derivative Liability |  | 0 |  | 0 |  | 0
Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Matured derivative financial instruments |  | (8) | $ (3) | (17) | $ (1) |
Derivative Asset, Fair Value, Gross Asset |  | 17 |  | 17 |  | 6
Derivative Liability, Fair Value, Gross Liability |  | 6 |  | 6 |  | 1
Derivative Asset, Fair Value, Gross Liability |  | 4 |  | 4 |  | 0
Derivative Liability, Fair Value, Gross Asset |  | 4 |  | 4 |  | 0
Derivative Asset |  | 13 |  | 13 |  | 6
Derivative Liability |  | 2 |  | 2 |  | 1
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 77 |  | 77 |  | 68
Derivative Liability, Fair Value, Gross Liability |  | 28 |  | 28 |  | 20
Derivative Asset |  | 77 |  | 77 |  | 68
Derivative Liability |  | 28 |  | 28 |  | 20
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 17 |  | $ 17 |  | 6
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 54 |  | 54 |  |
Derivative, Average Forward Price | $ / lb |  | 2.50 |  | 2.50 |  |
Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Matured derivative financial instruments |  | $ 24 |  | $ 24 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 150 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.34 |  |  |  |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 77 |  | 77 |  | 68
Derivative Liability, Fair Value, Gross Liability |  | $ 28 |  | $ 28 |  | 20
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 16 |  |
Derivative, Average Forward Price | $ / lb |  | 2.62 |  | 2.62 |  |
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 |  | 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 |  | $ 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 |  | 2.73 |  | 2.73 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 314 |  |
Derivative, Average Forward Price | $ / lb |  | 2.50 |  | 2.50 |  |
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 2.73 |  | 2.73 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 116 |  |
Derivative, Average Forward Price | $ / lb |  | 2.48 |  | 2.48 |  |
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Derivative Average Market Price | $ / oz |  | 1,779 |  | 1,779 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  |  |  | 87 |  |
Derivative, Average Forward Price | $ / oz |  | 1,725 |  | 1,725 |  |
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 179 | (109) | $ (52) | 11 |
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | 162 | (122) | (76) | 0 |
Sales [Member] | gold and other | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | 17 | 13 | 24 | 11 |
Cost of Sales [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Matured derivative financial instruments |  | $ (4) | $ (4) | $ 19 | $ (3) |

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