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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Statements Of Comprehensive Earnings) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Oil, gas and NGL derivatives | $ 155 | $ (453) | $ 521
Commodity Contract [Member] | Oil, Gas and NGL Sales [Member] |  |  |
Derivative [Line Items] |  |  |
Oil, gas and NGL derivatives | $ 155 | (454) | 457
Commodity Contract [Member] | Marketing and Midstream Revenues [Member] |  |  |
Derivative [Line Items] |  |  |
Oil, gas and NGL derivatives |  | $ 1 | (1)
Interest Rate Derivatives [Member] | Other Expenses [Member] |  |  |
Derivative [Line Items] |  |  |
Oil, gas and NGL derivatives |  |  | $ 65

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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