Supplementary Information On Natural Gas, Oil And NGL Reserves (Summary of Net Quantities of Proved, Developed and Undeveloped Natural Gas Oil and NGL Reserves) (Details)	3 Months Ended	12 Months Ended
Dec. 31, 2022 Bcfe bbl Mcf	Dec. 31, 2023 Bcfe bbl Mcf	Sep. 30, 2022 Bcfe bbl Mcf
Reserve Quantities [Line Items]
Proved Natural Gas and Oil Reserves, Beginning Balance \| Bcfe	81.1	79.7	83
Revisions of previous estimates \| Bcfe	(3.5)	(5.3)	4.8
Acquisitions \| Bcfe	1.5	7.7	15.6
Divestitures \| Bcfe	(0.2)	(10.2)	(17.6)
Extensions, discoveries and other additions \| Bcfe	3	8.8	4.9
Production \| Bcfe	(2.2)	(9.4)	(9.6)
Proved Natural Gas and Oil Reserves, Ending Balance \| Bcfe	79.7	71.2	81.1
Natural Gas [Member]
Reserve Quantities [Line Items]
Proved Natural Gas and Oil Reserves, Beginning Balance \| Mcf	62,237,206	61,205,493	64,952,668
Revisions of previous estimates \| Mcf	(3,126,679)	(4,997,247)	2,405,959
Acquisitions \| Mcf	1,424,204	7,322,724	15,302,364
Divestitures \| Mcf	(131,497)	(7,296,462)	(16,624,066)
Extensions, discoveries and other additions \| Mcf	2,471,579	7,211,533	3,627,989
Production \| Mcf	(1,669,320)	(7,457,084)	(7,427,708)
Proved Natural Gas and Oil Reserves, Ending Balance \| Mcf	61,205,493	55,988,957	62,237,206
Oil [Member]
Reserve Quantities [Line Items]
Proved Natural Gas and Oil Reserves, Beginning Balance	1,382,777	1,372,006	1,504,840
Revisions of previous estimates	(31,388)	29,514	(13,498)
Acquisitions	8,179	35,228	29,987
Divestitures		(340,265)	(72,244)
Extensions, discoveries and other additions	64,844	158,395	132,227
Production	(52,406)	(182,916)	(198,535)
Proved Natural Gas and Oil Reserves, Ending Balance	1,372,006	1,071,962	1,382,777
NGL [Member]
Reserve Quantities [Line Items]
Proved Natural Gas and Oil Reserves, Beginning Balance	1,762,683	1,708,575	1,501,853
Revisions of previous estimates	(31,989)	(86,414)	409,597
Acquisitions	7,370	20,361	18,260
Divestitures	(7,861)	(145,231)	(83,931)
Extensions, discoveries and other additions	16,983	102,849	82,024
Production	(38,611)	(137,484)	(165,120)
Proved Natural Gas and Oil Reserves, Ending Balance	1,708,575	1,462,656	1,762,683

Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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Production of proved reserves.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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