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Supplemental Information to Statements of Cash Flows (Schedule Of Supplemental Information To Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Changes in assets and liabilities, net:        
Accounts receivable $ 0 $ 364 $ 0 $ (439)
Other current assets 0 (84) 0 (105)
Other long-term assets 0 9 0 84
Accounts payable and revenues and royalties payable 0 (313) 0 474
Other current liabilities 0 (208) 0 (107)
Other long-term liabilities 0 (3) 0 (87)
Total (61) (235) (189) (180)
Supplementary cash flow data:        
Interest paid 77 100 266 285
Income taxes paid $ 50 $ 253 $ 309 $ 363