Accounting For Suspended Exploratory Well Costs (Schedule Of Period End Capitalized Suspended Exploratory Well Costs) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Capitalized Exploratory Well Costs [Line Items]
Capitalized for a period of one year or less	$ 453	$ 200	$ 378
Capitalized for a period greater than one year - subtotal	3,147	3,359	3,134
Total	3,600	3,559	3,512	$ 4,120
Capitalized For A Period Of Between One And Five Years [Member]
Capitalized Exploratory Well Costs [Line Items]
Capitalized for a period greater than one year - subtotal	583	1,030	969
Capitalized For A Period Of Between Five And Ten Years [Member]
Capitalized Exploratory Well Costs [Line Items]
Capitalized for a period greater than one year - subtotal	1,544	1,411	1,410
Capitalized For A Period Of Greater Than Ten Years [Member]
Capitalized Exploratory Well Costs [Line Items]
Capitalized for a period greater than one year - subtotal	$ 1,020	$ 918	$ 755