Financial and Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Total Assets at Fair Value	$ 205	$ 413
Total Liabilities at Fair Value	53	84
Commodity Contract [Member] \| Accounts and notes receivable, net [Member]
Derivatives, Fair Value [Line Items]
Total Assets at Fair Value	200	401
Commodity Contract [Member] \| Long term receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total Assets at Fair Value	5	12
Commodity Contract [Member] \| Accounts payable [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities at Fair Value	51	57
Commodity Contract [Member] \| Deferred credits and other noncurrent obligations [Member]
Derivatives, Fair Value [Line Items]
Total Liabilities at Fair Value	$ 2	$ 27

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as a liability.

+ References

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- Definition

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+ References

No definition available.

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