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Acquisitions And Divestitures (Schedule Of Purchase Price Allocation For General Partner) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 07, 2014
Assets acquired:        
Goodwill $ 6,303us-gaap_Goodwill $ 5,858us-gaap_Goodwill $ 6,079us-gaap_Goodwill  
General Partner [Member]        
Assets acquired:        
Current assets       437us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Property, plant and equipment, net       2,438us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Intangible assets       569us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Equity investment       222dvn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquityMethodInvestment
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Goodwill       3,283us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
[1]
Other long-term assets       1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Liabilities assumed:        
Current liabilities       (515)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Long-term debt       (1,454)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Deferred income taxes       (210)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Other long-term liabilities       (101)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
Total consideration and fair value of noncontrolling interests       $ 4,670us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_GeneralPartnerMember
[1] Goodwill is the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill is not amortized and is not deductible for tax purposes.