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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | $ 6 | $ 50
Fair value of derivative liabilities | 148 | 31
Commodity Contract [Member] | Other Current Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | 5 | 49
Commodity Contract [Member] | Other Long-Term Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | 1 | 1
Commodity Contract [Member] | Other Current Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative liabilities | 143 | 30
Commodity Contract [Member] | Other Long-Term Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative liabilities | $ 5 | $ 1

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