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Supplemental Quarterly Financial Information (Schedule Of Unaudited Interim Results Of Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 5,995 us-gaap_Revenues | $ 5,336 us-gaap_Revenues | $ 4,510 us-gaap_Revenues | $ 3,725 us-gaap_Revenues | $ 2,624 us-gaap_Revenues | $ 2,714 us-gaap_Revenues | $ 3,088 us-gaap_Revenues | $ 1,971 us-gaap_Revenues | $ 19,566 us-gaap_Revenues | $ 10,397 us-gaap_Revenues | $ 9,501 us-gaap_Revenues
Earnings (loss) before income taxes | 291 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,654 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,554 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 560 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 475 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 639 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 997 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (1,962)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,059 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 149 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (317)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net earnings (loss) attributable to Devon | $ (408)us-gaap_NetIncomeLoss | $ 1,016 us-gaap_NetIncomeLoss | $ 675 us-gaap_NetIncomeLoss | $ 324 us-gaap_NetIncomeLoss | $ 207 us-gaap_NetIncomeLoss | $ 429 us-gaap_NetIncomeLoss | $ 683 us-gaap_NetIncomeLoss | $ (1,339)us-gaap_NetIncomeLoss | $ 1,607 us-gaap_NetIncomeLoss | $ (20)us-gaap_NetIncomeLoss | $ (206)us-gaap_NetIncomeLoss
Basic net earnings (loss) per share attributable to Devon | $ (1.01)us-gaap_EarningsPerShareBasic | $ 2.48 us-gaap_EarningsPerShareBasic | $ 1.65 us-gaap_EarningsPerShareBasic | $ 0.80 us-gaap_EarningsPerShareBasic | $ 0.51 us-gaap_EarningsPerShareBasic | $ 1.06 us-gaap_EarningsPerShareBasic | $ 1.69 us-gaap_EarningsPerShareBasic | $ (3.34)us-gaap_EarningsPerShareBasic | $ 3.93 us-gaap_EarningsPerShareBasic | $ (0.06)us-gaap_EarningsPerShareBasic | $ (0.52)us-gaap_EarningsPerShareBasic
Diluted net earnings (loss) per share attributable to Devon | $ (1.01)us-gaap_EarningsPerShareDiluted | $ 2.47 us-gaap_EarningsPerShareDiluted | $ 1.64 us-gaap_EarningsPerShareDiluted | $ 0.79 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 1.68 us-gaap_EarningsPerShareDiluted | $ (3.34)us-gaap_EarningsPerShareDiluted | $ 3.91 us-gaap_EarningsPerShareDiluted | $ (0.06)us-gaap_EarningsPerShareDiluted | $ (0.52)us-gaap_EarningsPerShareDiluted

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