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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Changes in assets and liabilities, net:
Accounts receivable	$ 60	$ (131)	$ 31	$ (162)
Other current assets	(5)	6	7	(95)
Other long-term assets	(6)	(25)	(15)	(66)
Accounts payable	15	73	(21)	93
Revenues and royalties payable	(68)	139	(60)	210
Other current liabilities	(67)	4	(90)	95
Other long-term liabilities	12	(1)	5	(4)
Total	(59)	65	(143)	71
Supplementary cash flow data - total operations:
Interest paid (net of capitalized interest)	108	138	161	214
Income taxes paid (refunded)	$ 10	$ (7)	$ 16	$ (6)

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- Definition

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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