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Supplemental Information To Statements Of Cash Flows (Schedule Of Supplemental Information To Statements Of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in assets and liabilities, net:
Accounts receivable	$ (526)	$ 231	$ (3)
Income tax receivable	91	(127)	(22)
Other current assets	(61)	30	15
Other long-term assets	12	(9)	17
Accounts payable and revenues and royalties payable	539	(109)	(46)
Other current liabilities	(18)	(68)	(66)
Other long-term liabilities	(153)	(43)	23
Total	(116)	(95)	(82)
Supplementary cash flow data - total operations:
Interest paid	404	259	308
Income taxes paid (refunded)	$ (116)	$ 171	$ 6

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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