Litigation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		0 Months Ended		1 Months Ended							12 Months Ended
	Dec. 31, 2013 breach	Dec. 31, 2013 MTBE [Member] Pending Litigation [Member] LegalMatter	Jul. 02, 2013 Ecuador Litigation [Member] Pending Litigation [Member]	Aug. 03, 2012 Ecuador Litigation [Member] Pending Litigation [Member]	Sep. 30, 2010 Ecuador Litigation [Member] Pending Litigation [Member]	Aug. 31, 2010 Ecuador Litigation [Member] Pending Litigation [Member]	Nov. 13, 2013 Ecuador Litigation [Member] Pending Litigation [Member]	Nov. 06, 2012 Ecuador Litigation [Member] Pending Litigation [Member]	Jan. 03, 2012 Ecuador Litigation [Member] Pending Litigation [Member]	Feb. 14, 2011 Ecuador Litigation [Member] Pending Litigation [Member]	Dec. 31, 2008 Ecuador Litigation [Member] Pending Litigation [Member]	Dec. 31, 2013 Pending Litigation [Member] Ecuador Litigation [Member] LegalMatter	Dec. 31, 2013 Pending Litigation [Member] Ecuador Litigation [Member]	Dec. 31, 2013 Pending Litigation [Member] Ecuador Litigation [Member] Declatory Relief Claim [Member] LegalMatter	Dec. 31, 2013 Pending Litigation [Member] Ecuador Litigation [Member] Discovery Stay On Claims [Member] LegalMatter
Loss Contingencies [Line Items]
Pending lawsuits and claims (in number of claims)		10										9		1	8
Remediation program term (in years)												3 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
Approximate damages on plaintiffs' submission, Minimum					16,000
Approximate damages on plaintiffs' submission, Maximum					76,000
Approximate unjust enrichment on plaintiffs' submission, Maximum					38,000
Approximate unjust enrichment on plaintiffs' submission, Minimum					5,000
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 (in days)										15 days
Approved court-appointed liquadator's report damages for total judgment				19,100
Litigation Settlement, Amount to be Paid Via Third Party			$ 96
Proposed additional payment for plaintiff attorney fees as percentage of judgment									0.10%
Percentage of payments withheld by third parties due to freeze order								40.00%
Percentage of funds wIthheld by banks due to freeze order								40.00%
Number of contract breaches	7