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Summary of Significant Accounting Policies - Schedule of Percent of Consolidated Revenue of Major Customers, Those Whose Total Represented 10% or More of Oil, Natural Gas and NGL Revenues (Details) - Sales Revenue - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shell Trading (US) Company
Concentration Risk [Line Items]
Concentration risk, percentage	47.00%	58.00%	65.00%
Phillips 66
Concentration Risk [Line Items]
Concentration risk, percentage	22.00%	28.00%	18.00%
Chevron Products Company
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%

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