Property, Plant and Equipment - Aging of Capitalized Exploratory Well Costs (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) project well	Sep. 30, 2022 USD ($) well project	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 185,477	$ 181,461	$ 171,860	$ 179,481
No. of Wells (in wells) | well	6	10
No. of Projects (in projects) | project	5	7
Zero to one year
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 0	$ 8,851
No. of Wells (in wells) | well	0	2
No. of Projects (in projects) | project	0	2
One to two years
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 38,817	$ 8,489
No. of Wells (in wells) | well	1	2
No. of Projects (in projects) | project	1	2
Two to three years
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 2,698	$ 0
No. of Wells (in wells) | well	1	0
No. of Projects (in projects) | project	1	0
Three years or more
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 143,962	$ 164,121
No. of Wells (in wells) | well	4	6
No. of Projects (in projects) | project	3	3