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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.

X

- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a),(c),(d),(e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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