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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Changes in assets and liabilities, net:
Accounts receivable	$ (346)	$ (100)	$ 803	$ (163)
Other current assets	(85)	(88)	21	78
Other long-term assets	(9)	(14)	(75)	(24)
Accounts payable and revenues and royalties payable	540	72	787	88
Other current liabilities	93	52	101	19
Other long-term liabilities	13	(81)	(84)	(108)
Total	198	17	55	(110)
Supplementary cash flow data - total operations:
Interest paid	85	105	185	219
Income taxes paid (refunded)	$ (133)	$ (106)	$ (110)	$ (112)