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Litigation (Details) $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 27, 2017 defendant | Nov. 13, 2013 USD ($) | Aug. 03, 2012 USD ($) | Feb. 14, 2011 USD ($) | Dec. 31, 1991 USD ($) | Sep. 30, 2019 LegalMatter | Jan. 03, 2012
MTBE | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pending lawsuits and claims (in number of claims) | LegalMatter |  |  |  |  |  | 6 |
Ecuador | Declaratory Relief Claim |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pending lawsuits and claims (in number of claims) | LegalMatter |  |  |  |  |  | 1 |
Ecuador | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Conducted remediation program |  |  |  |  | 3 years |  |
Remediation program |  |  |  |  | $ 40 |  |
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 |  |  |  |
Writ of Certiorari |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of defendants | defendant | 2 |  |  |  |  |  |

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