Accounting For Suspended Exploratory Well Costs (Schedule Of Period-End Capitalized Suspended Exploratory Well Costs) (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|
| Capitalized Exploratory Well Costs [Line Items] | ||||
| Capitalized for a period of one year or less | $ 250 | $ 453 | $ 200 | |
| Capitalized for a period greater than one year - subtotal | 3,036 | 3,147 | 3,359 | |
| Total | 3,286 | 3,600 | 3,559 | $ 3,512 |
| Capitalized For A Period Of Between One And Five Years | ||||
| Capitalized Exploratory Well Costs [Line Items] | ||||
| Capitalized for a period greater than one year - subtotal | 933 | 583 | 1,030 | |
| Capitalized For A Period Of Between Five And Ten Years | ||||
| Capitalized Exploratory Well Costs [Line Items] | ||||
| Capitalized for a period greater than one year - subtotal | 1,144 | 1,544 | 1,411 | |
| Capitalized For A Period Of Greater Than Ten Years | ||||
| Capitalized Exploratory Well Costs [Line Items] | ||||
| Capitalized for a period greater than one year - subtotal | $ 959 | $ 1,020 | $ 918 |