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, 2024	Mar. 31, 2023
Changes in assets and liabilities, net:
Accounts receivable	$ (96)	$ 150
Other current assets	(23)	16
Other long-term assets	49	31
Accounts payable and revenues and royalties payable	143	(165)
Other current liabilities	116	(3)
Other long-term liabilities	(19)	(17)
Total	170	12
Supplementary cash flow data:
Interest paid	63	101
Income taxes refunded	$ (4)	$ 0