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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($) $ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Lawsuits, commitments and contingencies |  |  |
Long-term purchase commitment | $ 2.0 |  |
Long-term purchase commitment, term | 10 years |  |
Arbitration filed by Andes Petroleum Ecuador Ltd |  |  |
Lawsuits, commitments and contingencies |  |  |
Proceeds from settlement |  |  | $ 1.0
Recovery of amount awarded in settlement amount (as a percent) |  |  | 60.00%
Percentage of judgment amount claimed |  | 40.00% |
Own economic interest (as a percent) |  | 60.00% |

X
- Definition The percentage of litigation award claimed by third party. + References No definition available. + Details
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- Definition The percentage of economic interest owned. + References No definition available. + Details
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X
- Definition The percentage of award to the recovery value of property. + References No definition available. + Details
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Balance Type: | na
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Details
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