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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unit-based compensation | $ 199 us-gaap_AllocatedShareBasedCompensationExpense | $ 157 us-gaap_AllocatedShareBasedCompensationExpense | $ 179 us-gaap_AllocatedShareBasedCompensationExpense |
Options, Granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |
2009 Long Term Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Plan expiration date | Jun. 02, 2019 |  |  |
Shares authorized for issuance |  |  |  | 21,500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dvn_TwoThousandNineLongTermIncentivePlanMember
2009 Plan Amendment [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for issuance |  |  |  | 47,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dvn_TwoThousandNineLongTermIncentivePlanAmendmentMember
Stock Options And Stock Appreciation Rights [Member] | 2009 Plan Amendment [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares used to calculate shares issued under the 2009 Long-Term Incentive Plan, options and stock appreciation rights |  |  |  | 1 dvn_NumberOfSharesUsedToCalculateSharesIssuedUnderPlanOptionsGranted / us-gaap_AwardTypeAxis = dvn_StockOptionsAndStockAppreciationRightsMember / us-gaap_PlanNameAxis = dvn_TwoThousandNineLongTermIncentivePlanAmendmentMember
Other Awards [Member] | 2009 Plan Amendment [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares used to calculate shares issued under the 2009 Long-Term Incentive Plan, other awards |  |  |  | 2.38 dvn_NumberOfSharesUsedToCalculateSharesIssuedUnderPlanOtherAwards / us-gaap_AwardTypeAxis = dvn_OtherAwardsMember / us-gaap_PlanNameAxis = dvn_TwoThousandNineLongTermIncentivePlanAmendmentMember
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards and units | 3 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 1 year |  |  |
Expiration duration of options | 8 years |  |  |
Aggregate intrinsic value | 9.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 34.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Restricted Stock Awards And Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards and units | 194 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 2 years 6 months |  |  |
Total aggregate fair value of vested restricted awards and units | 112 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember | 141 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember | 112 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember |
Vested awards | 1,767,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember |  |  |
Performance-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards and units | 5 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 2 years 10 months 24 days |  |  |
Total aggregate fair value of vested restricted awards and units | 10 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember | 5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember |  |
Vested awards | 170,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember |
Performance Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards and units | 34 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 1 year 9 months 18 days |  |  |
Number of predetermined peer companies to compare against Devon's total shareholder's return for Performance awards | 14 dvn_NumberOfPredeterminedPeerCompaniesCompareTotalShareholderSReturnForPerformanceAwards / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember |  |  |
Minimum [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 0 years |  |  |
Minimum [Member] | Restricted Stock Awards And Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 0 years |  |  |
Minimum [Member] | Performance-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 0 years |  |  |
Minimum [Member] | Performance Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Comparison period of peer companies for performance awards | 2 years |  |  |
Percentage of vesting units to units granted | 0.00%dvn_PercentageOfVestingUnitsToUnitsGranted / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum [Member] | Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Maximum [Member] | Restricted Stock Awards And Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Maximum [Member] | Performance-Based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Maximum [Member] | Performance Share Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Comparison period of peer companies for performance awards | 3 years |  |  |
Percentage of vesting units to units granted | 200.00%dvn_PercentageOfVestingUnitsToUnitsGranted / us-gaap_AwardTypeAxis = dvn_PerformanceShareUnitsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
EnLink [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unit-based compensation | 17 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dvn_EnlinkMember |  |  |
Unrecognized compensation cost related to unvested awards and units | 20 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dvn_EnlinkMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 1 year 10 months 24 days |  |  |
General Partner [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards and units | $ 21 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_GeneralPartnerMember |  |  |
Weighted average period for recognition of cost of unvested awards and units | 1 year 10 months 24 days |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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