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Financial Instruments and Risk Management (Risk Management Positions) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) $ / bbl $ / Mcf MBbls	Dec. 31, 2024 USD ($)
Derivative [Line Items]
Total Fair Value Position	$ 75	$ (20)
Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls	36.2
Term	Dec. 31, 2026
Price Risk Derivatives, at Fair Value, Net	$ 48
Oil [Member] | Basis Contracts Maturing 2026 [Member]
Derivative [Line Items]
Price Risk Derivatives, at Fair Value, Net	0
Oil and NGLs [Member]
Derivative [Line Items]
Price Risk Derivatives, at Fair Value, Net	$ 48
Oil and NGLs [Member] | Basis Contracts Maturing 2026 [Member]
Derivative [Line Items]
Term	Dec. 31, 2026
Natural Gas [Member] | Fair Value Position Excluding Unexpired Options [Member]
Derivative [Line Items]
Price Risk Derivatives, at Fair Value, Net	$ 27
Natural Gas [Member] | AECO Fixed Price Maturing 2026 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls	100
Term	Dec. 31, 2026
Average Price, Fixed Price Contracts | $ / Mcf	2.33
Price Risk Derivatives, at Fair Value, Net	$ 12
Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls	462
Term	Dec. 31, 2026
Price Risk Derivatives, at Fair Value, Net	$ 27
Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volumes/day | MBbls	25
Term	Dec. 31, 2027
Price Risk Derivatives, at Fair Value, Net	$ 0
Natural Gas [Member] | Basis Contracts Maturing 2026 [Member]
Derivative [Line Items]
Term	Dec. 31, 2026
Price Risk Derivatives, at Fair Value, Net	$ 0
Natural Gas [Member] | Basis Contracts Maturing 2027 [Member]
Derivative [Line Items]
Term	Dec. 31, 2027
Price Risk Derivatives, at Fair Value, Net	$ 3
Natural Gas [Member] | Basis Contracts [Member]
Derivative [Line Items]
Price Risk Derivatives, at Fair Value, Net	0
Natural Gas [Member] | Physical Forward Contracts [Member]
Derivative [Line Items]
Price Risk Derivatives, at Fair Value, Net	$ (15)
Call Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Average Price, Options/Collars | $ / bbl	71.14
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Average Price, Options/Collars | $ / bbl	6.46
Call Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2027 [Member]
Derivative [Line Items]
Average Price, Options/Collars | $ / bbl	6.16
Put Option [Member] | Sold [Member] | Oil [Member] | WTI Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Average Price, Options/Collars | $ / bbl	50.86
Put Option [Member] | Sold [Member] | Natural Gas [Member] | NYMEX Three-Way Options Maturing 2026 [Member]
Derivative [Line Items]
Average Price, Options/Collars | $ / bbl	2.61
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	60.21
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
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, 2026
Maximum [Member] | Natural Gas [Member] | Basis Contracts [Member]
Derivative [Line Items]
Term	Dec. 31, 2030
Maximum [Member] | Natural Gas [Member] | Physical Forward Contracts [Member]
Derivative [Line Items]
Term	Dec. 31, 2037

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