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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 |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) lb $ / lb $ / lb $ / oz | Jun. 30, 2018 USD ($) lb oz $ / lb $ / lb $ / oz | Jun. 30, 2018 USD ($) $ / lb $ / lb $ / oz | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / lb $ / lb $ / oz | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 23 | $ 23 | $ 23 |  | $ 23 |  | $ 167
Derivative Liability, Fair Value, Gross Liability | 81 | 81 | 81 |  | 81 |  | 33
Derivative Asset, Fair Value, Gross Liability | 0 | 0 | 0 |  | 0 |  | 1
Derivative Liability, Fair Value, Gross Asset | 0 | 0 | 0 |  | 0 |  | 1
Derivative Asset | 23 | 23 | 23 |  | 23 |  | 166
Derivative Liability | 81 | 81 | 81 |  | 81 |  | 32
Trade accounts receivable [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset | 0 | 0 | 0 |  | 0 |  | 151
Derivative Liability | 64 | 64 | 64 |  | 64 |  | 0
Other Current Assets |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset | 6 | 6 | 6 |  | 6 |  | 11
Derivative Liability | 0 | 0 | 0 |  | 0 |  | 0
Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset | 17 | 17 | 17 |  | 17 |  | 4
Derivative Liability | 17 | 17 | 17 |  | 17 |  | 32
Commodity Contract [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | 0 | $ 1 | 2 | $ 9 |
Derivative Asset, Fair Value, Gross Asset | 6 | 6 | 6 |  | 6 |  | 12
Derivative Liability, Fair Value, Gross Liability | 8 | 8 | 8 |  | 8 |  | 2
Derivative Asset, Fair Value, Gross Liability | 0 | 0 | 0 |  | 0 |  | 1
Derivative Liability, Fair Value, Gross Asset | 0 | 0 | 0 |  | 0 |  | 1
Derivative Asset | 6 | 6 | 6 |  | 6 |  | 11
Derivative Liability | 8 | 8 | 8 |  | 8 |  | 1
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 17 | 17 | 17 |  | 17 |  | 155
Derivative Liability, Fair Value, Gross Liability | 73 | 73 | 73 |  | 73 |  | 31
Derivative Asset, Fair Value, Gross Liability | 0 | 0 | 0 |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Asset | 0 | 0 | 0 |  | 0 |  | 0
Derivative Asset | 17 | 17 | 17 |  | 17 |  | 155
Derivative Liability | 73 | 73 | 73 |  | 73 |  | 31
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 0 | $ 0 | $ 0 |  | $ 0 |  | 11
Derivative, Nonmonetary Notional Amount, Mass | lb | 64 |  |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 3.08 | 3.08 | 3.08 |  | 3.08 |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 17 | $ 17 | $ 17 |  | $ 17 |  | 155
Derivative Liability, Fair Value, Gross Liability | $ 73 | $ 73 | $ 73 |  | $ 73 |  | 31
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 46 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 3.16 | 3.16 | 3.16 |  | 3.16 |  |
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 | $ 8 | $ 8 | $ 8 |  | $ 8 |  | 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 | 0 |  | 0 |  | 2
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 | $ 6 | $ 6 | $ 6 |  | $ 6 |  | 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 | 3.01 | 3.01 | 3.01 |  | 3.01 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 532 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 3.12 | 3.12 | 3.12 |  | 3.12 |  |
Copper | Long [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Average Market Price | $ / lb | 3.01 | 3.01 | 3.01 |  | 3.01 |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 159 |  |  |  |  |
Derivative, Average Forward Price | $ / lb | 3.11 | 3.11 | 3.11 |  | 3.11 |  |
Gold | Short [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Average Market Price | $ / oz | 1,254.91 | 1,254.91 | 1,254.91 |  | 1,254.91 |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 308 |  |  |  |  |
Derivative, Average Forward Price | $ / oz | 1,296.18 | 1,296.18 | 1,296.18 |  | 1,296.18 |  |
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  |  | $ (44) | 34 | $ (161) | 160 |
Sales [Member] | Copper | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  |  | (14) | 35 | (149) | 142 |
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 |  |  | (30) | (1) | (12) | 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 |  |  | 6 | $ (4) | 8 | $ (5) |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 31 | $ 31 | $ 31 |  | $ 31 |  | $ 24

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