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Other Comprehensive Earnings (Components Of Other Comprehensive Earnings) (Parenthetical) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Effect of new accounting pronouncement | $ (33) | [1]
ASU 2018-02 [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Effect of new accounting pronouncement | $ (33) |
[1] | As a result of Devon’s early adoption of ASU 2018-02 in the fourth quarter of 2018, Devon reclassified $33 million from accumulated other comprehensive income to retained earnings in the December 31, 2018 consolidated balance sheet.

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