Supplemental Information on Oil and Gas Producing Activities (Unaudited) - Changes In Reserves (Details) - Bcfe	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Information on Oil and Gas Producing Activities (Unaudited)
Extensions, discoveries and other additions	472	1,105	3,705
Revisions	1,486	(940)	(1,648)
Time period of the development plan	5 years	5 years	5 years
Increase (decrease) in proved reserves due to development plan revisions			(1,705)
Increase in proved reserves due to additions to development plan	1,475		595
Decrease in proved reserves due to reclassifications related to five-year rule	(824)	(922)	(2,300)
Increase In Proved Reserve Due To Improved Well Performance	565	491	63
Increase (decrease) in proved reserves resulting from price revisions	149	(1,126)	(157)
Increase Decrease In Proved Reserve Due To Ethane Recovery	121	485	315
Increase (decrease) in proved undeveloped properties reclassified from non-proved to proved undeveloped	651	132
Increase Decrease In Proved Reserve Due To Deconsolidation Of Equity Method Investment			(164)
Sales of reserves	670	113