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Debt And Related Expenses (Schedule Of Net Financing Cost Components) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt And Related Expenses [Abstract]      
Interest based on debt outstanding $ 546us-gaap_InterestExpenseDebt $ 466us-gaap_InterestExpenseDebt $ 440us-gaap_InterestExpenseDebt
Early retirement of debt 48dvn_EarlyRetirementOfDebt    
Capitalized interest (70)us-gaap_InterestCostsCapitalized (56)us-gaap_InterestCostsCapitalized (48)us-gaap_InterestCostsCapitalized
Other fees and expenses 12us-gaap_InterestExpenseOther 27us-gaap_InterestExpenseOther 14us-gaap_InterestExpenseOther
Interest expense 536us-gaap_InterestAndDebtExpense 437us-gaap_InterestAndDebtExpense 406us-gaap_InterestAndDebtExpense
Interest income (10)us-gaap_InvestmentIncomeInterest (20)us-gaap_InvestmentIncomeInterest (36)us-gaap_InvestmentIncomeInterest
Net financing costs $ 526dvn_FinancingCostsNet $ 417dvn_FinancingCostsNet $ 370dvn_FinancingCostsNet