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Supplemental Information On Oil And Gas Operations (Proved Total MMBoe Reserves) (Details)	12 Months Ended
	Dec. 31, 2014 MMBoe Mcf		Dec. 31, 2013 MMBoe		Dec. 31, 2012 MMBoe		Dec. 31, 2011 MMBoe
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance (MMBoe)	2,963us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]	2,963us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]	3,005us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]
Proved developed and undeveloped reserves, revisions due to prices (MMboe)	9dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy	[1]	94dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy	[1]	(171)dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy	[1]
Proved developed and undeveloped reserves, revisions other than price (MMBoe)	(65)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	[1]	(88)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	[1]	(68)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	[1]
Proved developed and undeveloped reserves, extension and discoveries (MMBoe)	211us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	[1]	261us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	[1]	449us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	[1]
Proved developed and undeveloped reserves, purchase of reserves (MMboe)	265us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	[1]	1us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	[1]
Proved developed and undeveloped reserves, production (MMBoe)	(246)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy	[1]	(253)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy	[1]	(250)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy	[1]
Proved developed and undeveloped reserves, sale of reserves (MMBoe)	(383)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	[1]	(15)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	[1]	(2)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	[1]
Proved developed and undeveloped reserves, ending balance (MMBoe)	2,754us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]	2,963us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]	2,963us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy	[1]
Proved developed reserves (MMBoe)	2,065us-gaap_ProvedDevelopedReservesBOE1	[1]	2,262us-gaap_ProvedDevelopedReservesBOE1	[1]	2,123us-gaap_ProvedDevelopedReservesBOE1	[1]	2,223us-gaap_ProvedDevelopedReservesBOE1	[1]
Proved developed producing reserves (MMBoe)	1,977dvn_ProvedDevelopedProducingReservesEnergy	[1]	2,154dvn_ProvedDevelopedProducingReservesEnergy	[1]	2,021dvn_ProvedDevelopedProducingReservesEnergy	[1]	2,069dvn_ProvedDevelopedProducingReservesEnergy	[1]
Proved undeveloped reserve (MMBoe)	689us-gaap_ProvedUndevelopedReserveBOE1	[1]	701us-gaap_ProvedUndevelopedReserveBOE1	[1]	840us-gaap_ProvedUndevelopedReserveBOE1	[1]	782us-gaap_ProvedUndevelopedReserveBOE1	[1]
Conversion rate of gas reserves from barrels of oil to Boe	6dvn_ConversionRateOfGasReservesFromMcfToBoe
United States [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance (MMBoe)	2,205us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	2,236us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	2,278us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, revisions due to prices (MMboe)	38dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	76dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(159)dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, revisions other than price (MMBoe)	(86)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(117)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(67)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, extension and discoveries (MMBoe)	197us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	212us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	367us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, purchase of reserves (MMboe)	265us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	1us-gaap_ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, production (MMBoe)	(207)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(189)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(183)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, sale of reserves (MMBoe)	(207)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	(14)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed and undeveloped reserves, ending balance (MMBoe)	2,205us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	2,205us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	2,236us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed reserves (MMBoe)	1,900us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	1,947us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	1,829us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	1,875us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved developed producing reserves (MMBoe)	1,815dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	1,857dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	1,743dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]	1,746dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_US	[1]
Proved undeveloped reserve (MMBoe)	305us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	258us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	407us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]	403us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_US	[1]
Canada [Member]
Reserve Quantities [Line Items]
Proved developed and undeveloped reserves, beginning balance (MMBoe)	758us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	727us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	727us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, revisions due to prices (MMboe)	(29)dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	18dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(12)dvn_ProvedDevelopedAndUndevelopedReservesRevisionsDueToPricesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, revisions other than price (MMBoe)	21us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	29us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(1)us-gaap_ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, extension and discoveries (MMBoe)	14us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	49us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	82us-gaap_ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, production (MMBoe)	(39)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(64)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(67)us-gaap_ProvedDevelopedAndUndevelopedReserveProductionEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, sale of reserves (MMBoe)	(176)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(1)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	(2)us-gaap_ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed and undeveloped reserves, ending balance (MMBoe)	549us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	758us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	727us-gaap_ProvedDevelopedAndUndevelopedReserveNetEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed reserves (MMBoe)	165us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	315us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	294us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	348us-gaap_ProvedDevelopedReservesBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved developed producing reserves (MMBoe)	162dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	297dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	278dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]	323dvn_ProvedDevelopedProducingReservesEnergy / us-gaap_StatementGeographicalAxis = country_CA	[1]
Proved undeveloped reserve (MMBoe)	384us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	443us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	433us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]	379us-gaap_ProvedUndevelopedReserveBOE1 / us-gaap_StatementGeographicalAxis = country_CA	[1]
[1] Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. This rate is not necessarily indicative of the relationship of natural gas and oil prices. Bitumen and natural gas liquids reserves are converted to Boe on a one-to-one basis with oil.

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Proved developed and undeveloped reserves, revisions due to prices (Energy)

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Proved developed producing reserves (Energy)

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from the extension of the proved acreage of previously discovered reservoir or discovery of new field with proved reserve or of new reservoir of proved reserve in old field, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of decrease in quantity of proved reserve of oil and gas resulting from sale of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

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Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

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Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

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