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Financial Instruments (Unsettled Derivatives) (Details) lb in Millions, $ in Millions | Mar. 31, 2017 USD ($) lb | Dec. 31, 2016 USD ($)
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 30 | $ 146
Derivative Liability, Fair Value, Gross Liability | 8 | 58
Derivative Asset, Fair Value, Gross Liability | 4 | 14
Derivative Liability, Fair Value, Gross Asset | 4 | 14
Derivative Asset | 26 | 132
Derivative Liability | 4 | 44
Trade accounts receivable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 20 | 119
Derivative Liability | 1 | 13
Other Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 6 | 7
Derivative Liability | 0 | 0
Accounts Payable and Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 0 | 6
Derivative Liability | 3 | 31
Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 6 | 9
Derivative Liability, Fair Value, Gross Liability | 1 | 2
Derivative Asset, Fair Value, Gross Liability | 1 | 2
Derivative Liability, Fair Value, Gross Asset | 1 | 2
Derivative Asset | 5 | 7
Derivative Liability | 0 | 0
Embedded Derivative Financial Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 24 | 137
Derivative Liability, Fair Value, Gross Liability | 7 | 56
Derivative Asset, Fair Value, Gross Liability | 3 | 12
Derivative Liability, Fair Value, Gross Asset | 3 | 12
Derivative Asset | 21 | 125
Derivative Liability | 4 | 44
Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 6 | 9
Derivative, Nonmonetary Notional Amount, Mass | lb | 48 |
Derivatives Not Designated as Hedging Instruments [Member] | Embedded Derivative Financial Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 24 | 137
Derivative Liability, Fair Value, Gross Liability | $ 7 | 56
Derivatives Not Designated as Hedging Instruments [Member] | Forward Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 8 |
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | $ 8 | 58
Commodity Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | FMC's Copper Futures and Swap Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | $ 1 | $ 2

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