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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]      
Net income (loss) $ 924us-gaap_NetIncomeLoss $ 704us-gaap_NetIncomeLoss $ (707)us-gaap_NetIncomeLoss
Change in derivatives:      
Settlements (16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] 185us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] 382us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1]
Ineffectiveness   (1)us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges [2] 1us-gaap_AmountOfIneffectivenessOnNetInvestmentHedges [2]
Change in fair value of derivative instruments 73us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [3] 22us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [3] 131us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [3]
Total change in derivatives 89us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (162)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (252)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Change in value of pension and other postretirement liabilities:      
Current period net gain (loss) (15)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [4] 11us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [4] (7)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax [4]
Amortization of prior service cost included in net periodic pension cost   1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [5] 1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax [5]
Total change in value of pension and other postretirement liabilities (15)swn_TotalChangeInValueOfPensionAndOtherPostretirementLiabilities 12swn_TotalChangeInValueOfPensionAndOtherPostretirementLiabilities (6)swn_TotalChangeInValueOfPensionAndOtherPostretirementLiabilities
Change in currency translation adjustment (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (4)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
Comprehensive income (loss) $ 990us-gaap_ComprehensiveIncomeNetOfTax $ 550us-gaap_ComprehensiveIncomeNetOfTax $ (965)us-gaap_ComprehensiveIncomeNetOfTax
[1] Net of $10, $(124), and $(249) million in taxes for the years ended December 31, 2014, 2013 and 2012, respectively.
[2] Net of $0, $1, and $(1) million in taxes for the years ended December 31, 2014, 2013 and 2012, respectively.
[3] Net of $49, $16, and $85 million in taxes for the years ended December 31, 2014, 2013 and 2012, respectively.
[4] Net of $(10), $8, and $(5) million in taxes for the years ended December 31, 2014, 2013 and 2012, respectively.
[5] Net of $0, $1, and $1 million in taxes for the years ended December 31, 2014, 2013, and 2012, respectively.