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Derivatives - Marketing Derivatives (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2021 $ / Barrel | Jun. 30, 2021 $ / Mcfe | Jun. 30, 2021 MMBbls | Jun. 30, 2021 Bcf | Dec. 31, 2020 $ / Barrel | Dec. 31, 2020 $ / Mcfe | Dec. 31, 2020 MMBbls | Dec. 31, 2020 Bcf
Marketing Derivatives | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average sales price (dollars per barrel and dollars per million cubic feet) | 69.05 | 3.61 |  |  | 46.05 | 2.58 |  |
Crude oil | Short position |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) | MMBbls |  |  | (24) |  |  |  | (31) |
Natural gas | Short position |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Outstanding net volumes on derivatives not designated as hedges (mmbls/bcf) | Bcf |  |  |  | (121) |  |  |  | (117)

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