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