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Financial Instruments (Unaudited) (Details) - Commodity Contract [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Fair Value Hedging [Member] | Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative financial instruments |  | $ 3 | $ (4) | $ 10 | $ 2
Hedged item – firm sales commitments |  | (3) | 4 | (10) | (2)
Matured derivative financial instruments |  | (4) | (1) | (8) | (11)
Derivatives not designated as hedging instruments [Member] | Embedded derivatives in provisional sales contracts [Member] | Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Realized and unrealized gains (losses) | [1] | 4 | (73) | 76 | (144)
Derivatives not designated as hedging instruments [Member] | Copper Forward Contracts [Member] | Cost of Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Realized and unrealized gains (losses) | [2] | (2) | (6) | 5 | (7)
Derivatives not designated as hedging instruments [Member] | Plains Exploration & Production Company [Member] | Crude Oil Options [Member] | Sales [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Realized and unrealized gains (losses) | [1] | $ 0 | $ 6 | $ 0 | $ 58
[1] | Amounts recorded in revenues.
[2] | Amounts recorded in cost of sales as production and delivery costs.

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