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Financial and Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Total assets at fair value	$ 22	$ 32
Total liabilities at fair value	124	109
Commodity | Accounts and notes receivable, net
Derivatives, Fair Value [Line Items]
Total assets at fair value	22	30
Commodity | Long-term receivables, net
Derivatives, Fair Value [Line Items]
Total assets at fair value	0	2
Commodity | Accounts payable
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	122	99
Commodity | Deferred credits and other noncurrent obligations
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	$ 2	$ 10

X

- Definition

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

+ References

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=84234895&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

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=84234895&loc=SL5624163-113959

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- Definition

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+ References

No definition available.

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