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Supplementary Oil and Gas Information (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Bcf
MMBbls
Dec. 31, 2024
USD ($)
MMBbls
Dec. 31, 2024
USD ($)
Bcf
Dec. 31, 2023
MMBbls
Bcf
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves, Net, Period Increase (Decrease) 268 (128.8)   (87.7)
Proved Developed and Undeveloped Reserves, Production 224.3 214.1   206.5
Revisions of previous estimates 198.2 (217.9)   (309.6)
Extensions and discoveries 138.9 300.1   285.3
Purchase of reserves in place 311.8 4   243.9
Sale of reserves in place 156.6 1   100.8
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative | $ $ 434 $ 764 $ 764  
Permian and Montney Assets [Member]        
Reserve Quantities [Line Items]        
Anticipated Timing of Inclusion of Costs In Amortization base, In Years 3 years      
Proved Developed [Member]        
Reserve Quantities [Line Items]        
Sale of reserves in place 156.6     100.8
Natural Gas [Member]        
Reserve Quantities [Line Items]        
Proved Developed and Undeveloped Reserves, Production | Bcf 680   621 599
Revisions of previous estimates | Bcf 1,243   (1,837) (482)
Extensions and discoveries | Bcf 598   660 1,061
Purchase of reserves in place | Bcf 916   7 218
Sale of reserves in place | Bcf 201   2 137
Change Due to Change in Approved Development Plan [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates 193.8     (330)
Change Due to Change in Approved Development Plan [Member] | Oil and NGLs [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates   (17.9)    
Change Due to Change in Approved Development Plan [Member] | Natural Gas [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates   (39.8) (239)  
Change Due To Changes In Prices [Member] | Oil and NGLs [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates 88.8 27.1    
Change Due To Changes In Prices [Member] | Natural Gas [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates   (319.1) (1,914)  
Change Due To Change In Other Than Prices [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates 93.2 97.5   9.2
Change Due To Change In Other Than Prices [Member] | Natural Gas [Member]        
Reserve Quantities [Line Items]        
Revisions of previous estimates   52.7 316