Litigation (Details) $ in Millions		1 Months Ended	12 Months Ended
	Nov. 13, 2013 USD ($)	Feb. 28, 2011 USD ($)	Dec. 31, 1991	Mar. 31, 2020 LegalMatter	Jan. 31, 2012
MTBE | Pending Litigation
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter				6
Ecuador | Pending Litigation
Loss Contingencies [Line Items]
Conducted remediation program			3 years
Amount assessed in damages	$ 9,500	$ 8,600
Amount assessed for plaintiffs representatives		900
Additional amount assessed in punitive damages		$ 8,600
Public apology date within judgment/clarification ruling (in days)		15 days
Proposed additional payment for plaintiff attorney fees as percentage of judgment					0.10%
Ecuador | Declaratory Relief Claim
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter				1