XML 75 R56.htm IDEA: XBRL DOCUMENT v3.22.1
Supplementary Information - Reserve Quantity Information (Detail)
 12 Months Ended
Dec. 31, 2021
MMcf
MBbls
Dec. 31, 2020
MBbls
MMcf
Oil [Member]    
Proved Developed Reserves:    
Beginning of year 2,684 4,381
Extensions, discoveries and improved recovery 69 11
Revisions of previous estimates 133 (995)
Converted from undeveloped reserves 1,747 25
Reserves sold 15 (29)
Reserve purchased   24
Production 738 (733)
End of year 5,386 2,684
Proved Undeveloped Reserves:    
Beginning of year 1,784 1,833
Extensions, discoveries and improved recovery (61)  
Revisions of previous estimates 31 (24)
Converted to developed reserves (1,747) (25)
Reserves Sold | MMcf (7)  
End of year   1,784
Total Proved Reserves at the End of the Year 5,386 4,468
NGLs [Member]    
Proved Developed Reserves:    
Beginning of year 2,258 2,914
Extensions, discoveries and improved recovery 1 7
Revisions of previous estimates (29) (239)
Converted from undeveloped reserves 231 5
Reserves sold 5 0
Reserve purchased   8
Production 416 (437)
End of year 2,882 2,258
Proved Undeveloped Reserves:    
Beginning of year 787 1,017
Extensions, discoveries and improved recovery (557)  
Revisions of previous estimates 4 (224)
Converted to developed reserves (231) (5)
Reserves Sold | MMcf (4)  
End of year   787
Total Proved Reserves at the End of the Year 2,882 3,045
Gas [Member]    
Proved Developed Reserves:    
Beginning of year | MMcf 13,633 19,995
Extensions, discoveries and improved recovery | MMcf 628 36
Revisions of previous estimates | MMcf 5,312 (1,721)
Converted from undeveloped reserves | MMcf 1,067 66
Reserves sold | MMcf 26 (1,400)
Reserve purchased | MMcf   38
Production | MMcf 3,236 (3,381)
End of year | MMcf 23,902 13,633
Proved Undeveloped Reserves:    
Beginning of year | MMcf 3,897 4,547
Extensions, discoveries and improved recovery | MMcf (2,726)  
Revisions of previous estimates | MMcf 386 (584)
Converted to developed reserves | MMcf (1,067) (66)
Reserves Sold | MMcf (489)  
End of year | MMcf   3,897
Total Proved Reserves at the End of the Year | MMcf 23,902 17,530