Property, Plant and Equipment (Aging of Capitalized Exploratory Well Costs) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) well project	Jun. 30, 2021 USD ($) well project	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 178,421	$ 197,537	$ 179,481	$ 181,616
No. of Wells (in wells) | well	15	14
No. of Projects (in projects) | project	8	8
Zero to one year
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 4,268	$ 13,881
No. of Wells (in wells) | well	2	3
No. of Projects (in projects) | project	2	3
One to two years
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 2,813	$ 23,811
No. of Wells (in wells) | well	2	3
No. of Projects (in projects) | project	2	3
Two to three years
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 26,848	$ 30,562
No. of Wells (in wells) | well	3	2
No. of Projects (in projects) | project	2	2
Three years or more
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]
Amount | $	$ 144,492	$ 129,283
No. of Wells (in wells) | well	8	6
No. of Projects (in projects) | project	2	0