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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in assets and liabilities, net:        
Accounts receivable $ 80 $ 39 $ 318 $ 10
Income tax receivable 1 (1) (112) (1)
Other current assets 30 (6) (8) 3
Other long-term assets   (7) (24) (15)
Accounts payable (44) 14 (2) (37)
Revenues and royalties payable (145) (62) (258) (16)
Other current liabilities (16) (66) (97) (89)
Other long-term liabilities (5) 14 28 9
Total (99) (75) (155) (136)
Supplementary cash flow data - total operations:        
Interest paid 66 108 130 161
Income taxes paid $ 21 $ 10 $ 172 $ 16