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, 2019 MBoe MBbls MMBbls MMcf	Dec. 31, 2018 MBoe MBbls MMBbls MMcf
Reserve Quantities [Line Items]
Proved developed | MBoe	17,183	13,068
Proved undeveloped | MBoe	34,243	41,560
Total proved | MBoe	51,426	54,628
Oil (MBbl)
Reserve Quantities [Line Items]
Proved developed reserves, net attributable to noncontrolling interest, volume | MBbls	9,933	7,917
Proved undeveloped reserves, net attributable to noncontrolling interest, volume | MBbls	18,769	24,709
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, volume | MBbls	28,702	32,626
Natural Gas (MMcf)
Reserve Quantities [Line Items]
Proved developed reserves, net attributable to noncontrolling interest, gas | MMcf	19,146	14,430
Proved undeveloped reserves, net attributable to noncontrolling interest, gas | MMcf	39,724	48,140
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, gas | MMcf	58,870	62,570
NGLs (MBbl)
Reserve Quantities [Line Items]
Proved developed reserves, net attributable to noncontrolling interest, volume | MMBbls	4,060	2,746
Proved undeveloped reserves, net attributable to noncontrolling interest, volume | MMBbls	8,853	8,828
Proved developed and undeveloped reserves, net attributable to noncontrolling interest, volume | MMBbls	12,913	11,574