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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
customer
Dec. 31, 2013
customer
Dec. 31, 2012
customer
Summary Of Significant Accounting Policies [Line Items]      
Number of purchasers attributing more than 10% operating revenues 0dvn_NumberOfPurchasers 0dvn_NumberOfPurchasers 0dvn_NumberOfPurchasers
Derivative collateral $ 524us-gaap_DerivativeCollateralObligationToReturnCash    
Held-to-maturity securities   $ 62us-gaap_HeldToMaturitySecuritiesFairValue  
Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Finite lived intangible asset useful life 10 years    
Depletion calculation holding period 3 years    
Property, plant and equipment, useful life 3 years    
Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Finite lived intangible asset useful life 20 years    
Depletion calculation holding period 4 years    
Property, plant and equipment, useful life 60 years