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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
Mar. 31, 2023
Mar. 31, 2022
Changes in assets and liabilities, net:    
Accounts receivable $ 150 $ (457)
Other current assets 16 64
Other long-term assets 31 66
Accounts payable and revenues and royalties payable (165) 247
Other current liabilities (3) 8
Other long-term liabilities (17) (71)
Total 12 (143)
Supplementary cash flow data:    
Interest paid 101 100
Income taxes refunded $ 0 $ (23)