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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	$ 199us-gaap_AllocatedShareBasedCompensationExpense	$ 157us-gaap_AllocatedShareBasedCompensationExpense	$ 179us-gaap_AllocatedShareBasedCompensationExpense
Options, Granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0us-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				21,500,000us-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				47,000,000us-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				1dvn_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				2.38dvn_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	3us-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	9.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	34.0us-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	194us-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	112us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember	141us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember	112us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_RestrictedStockAwardsAndUnitsMember
Vested awards	1,767,000us-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	5us-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	10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember	5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember
Vested awards	170,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = dvn_PerformanceBasedRestrictedStockAwardsMember		0us-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	34us-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	14dvn_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	17us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dvn_EnlinkMember
Unrecognized compensation cost related to unvested awards and units	20us-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	$ 21us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = us-gaap_GeneralPartnerMember
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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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