Property, Plant and Equipment - Narrative (Details) $ in Millions			6 Months Ended
	Jul. 31, 2023 USD ($)	Jul. 31, 2023 CAD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Well costs			$ 193,405,000	$ 178,421,000	$ 171,860,000	$ 179,481,000
Additions pending the determination of proved reserves			47,733,000	9,412,000
Capitalized exploratory well costs charged to expense			26,188,000	10,472,000
Exploratory well costs capitalized more than one year			184,900,000
Impairment of oil and gas properties			0	0
Proceeds from sales of property, plant and equipment			0	$ 47,000
Subsequent event
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of property plant equipment	$ 0
Vietnam
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			112,400,000
United States
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			65,000,000
Canada
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			4,800,000
Canada | Subsequent event
Property, Plant and Equipment [Line Items]
Proceeds from sales of property, plant and equipment		$ 150
Brunei
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			2,700,000
Mexico
Property, Plant and Equipment [Line Items]
Capitalized exploratory well costs charged to expense			$ 70,300,000