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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)