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Supplemental Information to Statements Of Cash Flows (Schedule Of Supplemental Information To Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in assets and liabilities, net:      
Accounts receivable $ 191 $ (142) $ (526)
Other current assets 95 (119) 30
Other long-term assets (36) 90 12
Accounts payable and revenues and royalties payable (335) 152 539
Other current liabilities (50) (97) (18)
Other long-term liabilities (9) (110) (153)
Total (144) (226) (116)
Supplementary cash flow data - total operations:      
Interest paid 378 370 404
Income taxes paid (refunded) $ 400 $ 438 $ (116)