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Litigation (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 36 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 27, 2017 defendant LegalMatter | Jul. 22, 2016 USD ($) | Nov. 13, 2013 USD ($) | Jul. 02, 2013 USD ($) | Aug. 03, 2012 USD ($) | Feb. 14, 2011 USD ($) | Sep. 30, 2010 USD ($) | Aug. 31, 2010 | Sep. 30, 2017 LegalMatter | Dec. 31, 1993 breach | Nov. 06, 2012 | Jan. 03, 2012 | Dec. 31, 2008 USD ($) | Dec. 31, 1998 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contract breaches | breach |  |  |  |  |  |  |  |  |  | 7 |  |  |  |
MTBE | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending lawsuits and claims (in number of claims) | LegalMatter |  |  |  |  |  |  |  |  | 7 |  |  |  |  |
Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded from |  | $ 96 |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount, including interest |  | $ 113 |  |  |  |  |  |  |  |  |  |  |  |
Ecuador | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conducted remediation program (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 |  |  | $ 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% |  |
Litigation settlement, amount awarded to |  |  |  |  | $ 19,100 |  |  |  |  |  |  |  |  |
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% |  |  |
Ecuador | Pending Litigation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate damages on plaintiffs' submission |  |  |  |  |  |  | $ 16,000 |  |  |  |  |  |  |
Approximate unjust enrichment on plaintiffs' submission |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |
Ecuador | Pending Litigation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate damages on plaintiffs' submission |  |  |  |  |  |  | 76,000 |  |  |  |  |  |  |
Approximate unjust enrichment on plaintiffs' submission |  |  |  |  |  |  | $ 38,000 |  |  |  |  |  |  |
Ecuador | Declaratory Relief Claim |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending lawsuits and claims (in number of claims) | LegalMatter |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Writ of Certiorari |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of defendants | defendant | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
New claims filed, number | LegalMatter | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Embargo Order | Ecuador |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded from |  |  |  | $ 96 |  |  |  |  |  |  |  |  |  |
Discovery Stay On Claims | Ecuador | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pending lawsuits and claims (in number of claims) | LegalMatter |  |  |  |  |  |  |  |  | 8 |  |  |  |  |

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