Litigation (Details) $ in Millions				1 Months Ended		12 Months Ended		36 Months Ended
	Jul. 22, 2016 USD ($)	Aug. 03, 2012 USD ($)	Feb. 14, 2011 USD ($)	Sep. 30, 2010 USD ($)	Aug. 31, 2010	Dec. 31, 2016 LegalMatter breach	Dec. 31, 1998 USD ($)	Dec. 31, 1993 breach	Nov. 13, 2013 USD ($)	Jul. 02, 2013 USD ($)	Nov. 06, 2012	Jan. 03, 2012	Dec. 31, 2008 USD ($)
Loss Contingencies [Line Items]
Number of contract breaches (in contracts) | breach						7
MTBE [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter						6
Ecuador Litigation [Member]
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter						9
Approved court-appointed liquadator's report damages for total judgment	$ 96
Number of contract breaches (in contracts) | breach								7
Gain related to litigation settlement	$ 113
Ecuador Litigation [Member] | Pending Litigation [Member]
Loss Contingencies [Line Items]
Remediation program term (in years)							3 years
Remediation program							$ 40
Financial compensation for purported damages on mining engineer's report													$ 18,900
Assessment for purported unjust enrichment on mining engineer's report													$ 8,400
Court order requiring the parties to provide their positions on damages within (in days)					45 days
Amount assessed in damages			$ 8,600						$ 9,500
Amount assessed for plaintiffs representatives			900
Additional amount assessed in punitive damages			$ 8,600
Public apology date within judgment			15 days
Proposed additional payment for plaintiff attorney fees as percentage of judgment												0.10%
Approved court-appointed liquadator's report damages for total judgment		$ 19,100
Amount to be paid via third party										$ 96
Percentage of payments withheld by third parties due to freeze order (percent)											40.00%
Percentage of funds wIthheld by banks due to freeze order (percent)											40.00%
Ecuador Litigation [Member] | Pending Litigation [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss				$ 16,000
Approximate Unjust Enrichment				5,000
Ecuador Litigation [Member] | Pending Litigation [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss				76,000
Approximate Unjust Enrichment				$ 38,000
Ecuador Litigation [Member] | Declaratory Relief Claim [Member]
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter						1
Ecuador Litigation [Member] | Discovery Stay On Claims [Member]
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims) | LegalMatter						8