v3.26.1
Financial Instruments and Risk Management (Risk Management Positions) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
$ / Mcf
$ / bbl
MBbls
MMcf
Dec. 31, 2025
USD ($)
Derivative [Line Items]    
Total Fair Value Position $ 165 $ 75
Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 47.7  
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ (222)  
Oil [Member] | WTI Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 7.4  
Term Dec. 31, 2027  
Price Risk Derivatives, at Fair Value, Net $ (14)  
Oil [Member] | Basis Contracts Maturing 2026 [Member]    
Derivative [Line Items]    
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ (4)  
Oil [Member] | WTI Fixed Price Contracts Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 4  
Term Dec. 31, 2026  
Average Price, Fixed Price Contracts | $ / Mcf 63.25  
Price Risk Derivatives, at Fair Value, Net $ (18)  
Oil [Member] | Other Financial Positions [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net $ (4)  
Oil [Member] | WTI Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 1  
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ (5)  
Oil and NGLs [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net (267)  
Natural Gas [Member] | Fair Value Position Excluding Unexpired Options [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net $ 432  
Natural Gas [Member] | NYMEX Fixed Price Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 20  
Term Dec. 31, 2026  
Average Price, Fixed Price Contracts | $ / Mcf 4.07  
Price Risk Derivatives, at Fair Value, Net $ 4  
Natural Gas [Member] | AECO Fixed Price Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 134  
Term Dec. 31, 2026  
Average Price, Fixed Price Contracts | $ / Mcf 2.3  
Price Risk Derivatives, at Fair Value, Net $ 37  
Natural Gas [Member] | AECO Fixed Price Maturing 2027 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 111  
Term Dec. 31, 2027  
Average Price, Fixed Price Contracts | $ / Mcf 2  
Price Risk Derivatives, at Fair Value, Net $ 6  
Natural Gas [Member] | AECO Fixed Price Maturing 2028 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 100  
Term Dec. 31, 2028  
Average Price, Fixed Price Contracts | $ / Mcf 2.05  
Price Risk Derivatives, at Fair Value, Net $ 2  
Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 450  
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ 28  
Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls 225  
Term Dec. 31, 2027  
Price Risk Derivatives, at Fair Value, Net $ (6)  
Natural Gas [Member] | Basis Contracts Maturing 2026 [Member]    
Derivative [Line Items]    
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ 72  
Natural Gas [Member] | Basis Contracts Maturing 2027 [Member]    
Derivative [Line Items]    
Term Dec. 31, 2027  
Price Risk Derivatives, at Fair Value, Net $ 65  
Natural Gas [Member] | Basis Contracts [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net 67  
Natural Gas [Member] | Physical Forward Contracts [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net $ 12  
Natural Gas [Member] | Physical Forward Contracts Maturing 2026 [Member]    
Derivative [Line Items]    
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ 60  
Natural Gas [Member] | Physical Forward Contracts Maturing 2027 [Member]    
Derivative [Line Items]    
Term Dec. 31, 2037  
Price Risk Derivatives, at Fair Value, Net $ 67  
Natural Gas [Member] | NYMEX Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MMcf 95  
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ 15  
Natural Gas [Member] | NYMEX Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MMcf 15  
Term Dec. 31, 2027  
Price Risk Derivatives, at Fair Value, Net $ 1  
Natural Gas [Member] | AECO Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MMcf 8  
Term Dec. 31, 2026  
Price Risk Derivatives, at Fair Value, Net $ 1  
Natural Gas [Member] | AECO Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount, Volumes/day | MMcf 8  
Term Dec. 31, 2027  
Price Risk Derivatives, at Fair Value, Net $ 1  
Natural Gas [Member] | Other Financial Positions [Member]    
Derivative [Line Items]    
Price Risk Derivatives, at Fair Value, Net $ 0  
Call Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 70.62  
Call Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 75.5  
Call Option [Member] | Sold [Member] | Oil [Member] | WTI Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 69.01  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 5.92  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 4.67  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 5.27  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 4.72  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | AECO Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 2.19  
Call Option [Member] | Sold [Member] | Natural Gas [Member] | AECO Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 2.4  
Put Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 50.46  
Put Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 50  
Put Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 2.58  
Put Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 2.5  
Put Option [Member] | Bought [Member] | Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 59.39  
Put Option [Member] | Bought [Member] | Oil [Member] | WTI Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 59.11  
Put Option [Member] | Bought [Member] | Oil [Member] | WTI Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 57.33  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 3.33  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / bbl 3.5  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | NYMEX Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 3.75  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | NYMEX Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 3.5  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | AECO Costless Collars Maturing 2026 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 1.72  
Put Option [Member] | Bought [Member] | Natural Gas [Member] | AECO Costless Collars Maturing 2027 [Member]    
Derivative [Line Items]    
Average Price, Options/Collars | $ / Mcf 1.79  
Minimum [Member] | Natural Gas [Member] | Basis Contracts [Member]    
Derivative [Line Items]    
Term Dec. 31, 2028  
Minimum [Member] | Natural Gas [Member] | Physical Forward Contracts [Member]    
Derivative [Line Items]    
Term Dec. 31, 2028  
Maximum [Member] | Natural Gas [Member] | Basis Contracts [Member]    
Derivative [Line Items]    
Term Dec. 31, 2031  
Maximum [Member] | Natural Gas [Member] | Physical Forward Contracts [Member]    
Derivative [Line Items]    
Term Dec. 31, 2037