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Derivative Financial Instruments (Schedule Of Derivative Financial Instruments Included In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | $ 127 | $ 674
Fair value of derivative liabilities | 7 | 33
Commodity Derivatives [Member] | Other Current Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | 117 | 634
Commodity Derivatives [Member] | Other Long-Term Assets [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative assets | 10 | 40
Commodity Derivatives [Member] | Other Current Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative liabilities | $ 7 | 32
Commodity Derivatives [Member] | Other Long-Term Liabilities [Member] |  |
Derivatives Fair Value [Line Items] |  |
Fair value of derivative liabilities |  | $ 1

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