Property, Plant and Equipment - Narrative (Details) $ in Millions			9 Months Ended
	Sep. 15, 2023 USD ($)	Sep. 15, 2023 CAD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Well costs			$ 185,477,000	$ 181,461,000	$ 171,860,000	$ 179,481,000
Additions pending the determination of proved reserves			40,825,000	22,275,000
Capitalized exploratory well costs charged to expense			26,143,000	20,295,000
Exploratory well costs capitalized more than one year			185,500,000
Impairment of oil and gas properties			0	$ 0
Mexico
Property, Plant and Equipment [Line Items]
Capitalized exploratory well costs charged to expense			81,700,000
Vietnam
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			112,800,000
United States
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			65,300,000
Canada
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			4,700,000
Proceeds from sales of property, plant and equipment		$ 139
Gain (loss) on sale of property plant equipment	$ 0
Brunei
Property, Plant and Equipment [Line Items]
Exploratory well costs capitalized more than one year			$ 2,700,000