Supplemental Information On Oil And Gas Exploration And Production Activities (Unaudited) - Changes in Quantities of Proved Oil and natural Gas and NGL Reserves Attributable to Noncontrolling Interests (Details)	Dec. 31, 2020 MBoe MBbls MMcf MMBbls	Dec. 31, 2019 MBoe MMBbls MBbls MMcf
Reserve Quantities [Line Items]
Proved developed | MBoe	20,516,000	17,183,000
Proved undeveloped | MBoe	21,737,000	34,243,000
Total proved | MBoe	42,253,000	51,426,000
Oil (MBbl)
Reserve Quantities [Line Items]
Proved undeveloped reserves, net attributable to noncontrolling interest, volume | MBbls	11,363,000	18,769,000
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, volume | MBbls	21,476,000	28,702,000
Proved developed reserves, net attributable to noncontrolling interest, volume | MBbls	10,113,000	9,933,000
Natural Gas (MMcf)
Reserve Quantities [Line Items]
Proved undeveloped reserves, net attributable to noncontrolling interest, gas | MMcf	29,704,000	39,724,000
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, gas | MMcf	59,577,000	58,870,000
Proved developed reserves, net attributable to noncontrolling interest, gas | MMcf	29,873,000	19,146,000
NGLs (MBbl)
Reserve Quantities [Line Items]
Proved undeveloped reserves, net attributable to noncontrolling interest, volume | MMBbls	5,423,000	8,853,000
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, volume | MMBbls	10,847,000	12,913,000
Proved developed reserves, net attributable to noncontrolling interest, volume | MMBbls	5,424,000	4,060,000