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Financial and Derivative Instruments - Fair Value of Derivatives Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total assets at fair value	$ 283	$ 22
Total liabilities at fair value	12	124
Commodity | Accounts and notes receivable, net
Derivatives, Fair Value [Line Items]
Total assets at fair value	279	22
Commodity | Long-term receivables, net
Derivatives, Fair Value [Line Items]
Total assets at fair value	4	0
Commodity | Accounts payable
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	12	122
Commodity | Deferred credits and other noncurrent obligations
Derivatives, Fair Value [Line Items]
Total liabilities at fair value	$ 0	$ 2

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

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+ References

No definition available.

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