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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Changes in assets and liabilities, net:        
Accounts receivable $ 21 $ 55 $ 339 $ 65
Income tax receivable   (12) (112) (13)
Other current assets 18 15 10 18
Other long-term assets (9) 14 (33) (1)
Accounts payable 11 23 9 (14)
Revenues and royalties payable 89 (72) (169) (88)
Other current liabilities 15 12 (82) (77)
Other long-term liabilities (87) 1 (59) 10
Total 58 36 (97) (100)
Supplementary cash flow data - total operations:        
Interest paid 64 $ 81 194 242
Income taxes paid (received) $ (2)   $ 170 $ 16