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Supplemental Information on Oil and Gas Operations (Unaudited) (Schedule Of Principal Changes In The Standardized Measure Of Discounted Future Net Cash Flows Attributable To Proved Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Information On Oil And Gas Operations [Abstract] |  |  |
Standardized measure of discounted future net cash flows, beginning balance | $ 5,398 | $ 7,150 | $ 5,954
Net changes in prices and production costs | (3,277) | (2,323) | 1,533
Oil, gas and NGL sales, net of production costs | (1,572) | (2,612) | (2,932)
Changes in estimated future development costs | 402 | 303 | (273)
Extensions and discoveries, net of future development costs | 988 | 1,690 | 2,944
Purchase of reserves | 23 | 43 |
Sales of reserves in place | (7) | (481) | (120)
Revisions of quantity estimates | 147 | (359) | (152)
Previously estimated development costs incurred during the period | 537 | 857 | 787
Accretion of discount | 285 | 506 | 648
Net change in income taxes and other | 548 | 624 | (1,239)
Standardized measure of discounted future net cash flows, ending balance | $ 3,472 | $ 5,398 | $ 7,150

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447 + Details
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