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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
Mar. 31, 2021
Mar. 31, 2020
Changes in assets and liabilities, net:    
Accounts receivable $ (63) $ 238
Income tax receivable 15 (113)
Other current assets (25) (38)
Other long-term assets (10) (24)
Accounts payable 71 42
Revenues and royalties payable (55) (113)
Other current liabilities (33) (81)
Other long-term liabilities (27) 33
Total (127) (56)
Supplementary cash flow data - total operations:    
Interest paid 114 64
Income taxes paid (refunded) $ (6) $ 151