Financial and Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Total assets at fair value	$ 32	$ 205
Total liabilities at fair value	109	53
Commodity Contract [Member] \| Accounts and notes receivable, net [Member]
Derivatives, Fair Value [Line Items]
Total assets at fair value	30	200
Commodity Contract [Member] \| Long term receivables, net [Member]
Derivatives, Fair Value [Line Items]
Total assets at fair value	2	5
Commodity Contract [Member] \| Accounts payable [Member]
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	99	51
Commodity Contract [Member] \| Deferred credits and other noncurrent obligations [Member]
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	$ 10	$ 2

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=64837297&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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