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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in assets and liabilities, net:
Accounts receivable	$ (100)	$ 80	$ (163)	$ 318
Income tax receivable	121	1	136	(112)
Other current assets	(33)	30	(58)	(8)
Other long-term assets	(14)		(24)	(24)
Accounts payable and revenues and royalties payable	72	(189)	88	(260)
Other current liabilities	52	(16)	19	(97)
Other long-term liabilities	(81)	(5)	(108)	28
Total	17	(99)	(110)	(155)
Supplementary cash flow data - total operations:
Interest paid	105	66	219	130
Income taxes paid (refunded)	$ (106)	$ 21	$ (112)	$ 172

Increase Decrease In Accounts Payable And Royalties Payable.

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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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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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Amount of increase (decrease) in current assets classified as other.

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Amount of increase (decrease) in current liabilities classified as other.

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Amount of increase (decrease) in noncurrent assets classified as other.

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Amount of increase (decrease) in noncurrent operating liabilities classified as other.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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