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Fair Value Measurement - Range and arithmetic average of significant unobservable inputs (Details) - Wind River Basin [Member] - Fair Value, Inputs, Level 3 [Member] - Fair Value Measurements Nonrecurring [Member] - Lower 48 [Member] $ in Millions |  | 1 Months Ended | 9 Months Ended
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Jan. 01, 2035 | Mar. 31, 2020 USD ($) $ / MMBTU MMcf | Sep. 30, 2020
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Fair Value Measurements, Nonrecurring, Measurement Period |  |  | During the first quarter of 2020
Fair Value Measurements, Valuation Processes, Description |  |  | The carrying value was written down to fair value. The fair value was estimated based on an internal discounted cash flow model using estimates of future production, an outlook of future prices using a combination of exchanges (short-term) and external pricing services companies (long-term), future operating costs and capital expenditures, and a discount rate believed to be consistent with those used by principal market participants.
Assets, Fair Value Disclosure | $ |  | $ 77 |
Valuation Technique, Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas production | MMcf |  | 8.4 |
Valuation Technique, Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas production | MMcf |  | 55.2 |
Valuation Technique, Discounted Cash Flow [Member] | Arithmetic Average [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas production | MMcf |  | 22.9 |
Measurement Input, Commodity Future Price [Member] | Forecast [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Future prices annual increase (decrease), percentage | 220.00% |  |
Measurement Input, Commodity Future Price [Member] | Minimum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas price outlook | $ / MMBTU |  | 2.67 |
Measurement Input, Commodity Future Price [Member] | Maximum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas price outlook | $ / MMBTU |  | 9.17 |
Measurement Input, Commodity Future Price [Member] | Arithmetic Average [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Natural gas price outlook | $ / MMBTU |  | 5.68 |
Measurement Input, Discount Rate [Member] | Minimum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 7.90% |
Measurement Input, Discount Rate [Member] | Maximum [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 9.10% |
Measurement Input, Discount Rate [Member] | Arithmetic Average [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Discount Rate |  | 8.30% |

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- Definition Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61797-109447 + Details
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