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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Changes in assets and liabilities, net:        
Accounts receivable $ 81 $ 98 $ (15) $ 248
Other current assets (84) (12) (107) 4
Other long-term assets (16) (13) 33 18
Accounts payable and revenues and royalties payable 42 (65) 185 (230)
Other current liabilities (224) (138) (108) (141)
Other long-term liabilities 0 (10) (19) (27)
Total (201) (140) (31) (128)
Supplementary cash flow data:        
Interest paid 112 88 175 189
Income taxes paid $ 388 $ 259 $ 384 $ 259