Supplementary Information On Natural Gas, Oil And NGL Reserves (Narrative) (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2022 Bcfe $ / bbl $ / Mcf	Dec. 31, 2023 Bcfe $ / bbl $ / Mcf	Dec. 31, 2023 Mcfe $ / bbl $ / Mcf	Dec. 31, 2023 $ / bbl $ / Mcf	Sep. 30, 2022 Bcfe $ / Mcf $ / bbl
Supplementary Oil And Gas Disclosures [Line Items]
Negative pricing revisions	1.4	4.8
Negative revisions	2.1	0.5
Reserve extensions, discoveries and other additions	3.0	8.8
Proved developed reserve	0.3	1.0
Proved undeveloped reserve	2.7	7.8
Production of oil and natural gas properties	2.2	9.4			9.6
Net PUD reserves decreased		0.7
Proved undeveloped reserves transferred to proved developed		12.3	12,328,750
Percentage transferred to proved developed				91.00%
Remaining revisions of proved undeveloped reserves		11.6
Remaining negative revisions of proved undeveloped reserves		0.5
Revisions percentage of proved undeveloped reserves				86.00%
Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Proved developed sale	0.2
Oklahoma And Texas [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Proved developed sale		10.2
Texas, Louisiana and Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Additional proved undeveloped acquisition		4.3
Texas, Louisiana, Oklahoma and North Dakota [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Proved undeveloped reserves, additions		7.8
Oil [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / bbl	92.74	76.85	76.85	76.85	90.33
NGL [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / bbl	39.18	21.98	21.98	21.98	38.09
Natural Gas [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Price used to calculate reserves and future cash flows from reserves | $ / Mcf	6.52	2.67	2.67	2.67	6.41
Oil, NGL And Natural Gas [Member] | East Texas, Western Louisiana, Mississippi Woodford and Oklahoma [Member]
Supplementary Oil And Gas Disclosures [Line Items]
Acquisition	1.5	7.7
Proved developed acquisition	0.5	3.4
Proved undeveloped acquisition	1	4.3