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Litigation (Details) - Pending Litigation $ in Millions		1 Months Ended	12 Months Ended
	Nov. 13, 2013 USD ($)	Feb. 28, 2011 USD ($)	Dec. 31, 1991	Dec. 31, 2020 LegalMatter
MTBE
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter				6
Ecuador Litigation
Loss Contingencies [Line Items]
Remediation program term (in years)			3 years
Damages awarded | $	$ 9,500	$ 9,500

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- Definition

Conducted remediation program.

+ References

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- Definition

Amount of damages awarded to the plaintiff in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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- Definition

Number of pending claims pertaining to a loss contingency.

+ References

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-Topic 450
-SubTopic 20
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