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Debt (Components Of Debt) (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Jan. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Apr. 22, 2015
Dec. 19, 2014
Debt Instrument [Line Items]          
Total short-term debt   $ 1,000,000us-gaap_ShortTermBorrowings $ 4,501,000,000us-gaap_ShortTermBorrowings    
Unamortized discount   (4,000,000)us-gaap_DebtInstrumentUnamortizedDiscount (1,000,000)us-gaap_DebtInstrumentUnamortizedDiscount    
Long-term debt   5,163,000,000us-gaap_LongTermDebtNoncurrent 2,466,000,000us-gaap_LongTermDebtNoncurrent    
Total debt   5,164,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount 6,967,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount    
Proceeds from issuance of shares 2,300,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity        
Credit Facility [Member]          
Debt Instrument [Line Items]          
Variable rate (1.673% and 1.515% at March 31, 2015 and December 31, 2014, respectively) unsecured revolving credit facility   800,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
300,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Credit facility, maturity date   Dec. 01, 2018      
7.35% Senior Notes due 2017 [Member] | Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility, variable interest rate   1.673%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
1.515%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
   
Senior Notes [Member]          
Debt Instrument [Line Items]          
Stated interest rate   7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior Notes [Member] | 7.15% Senior Notes due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   1,000,000us-gaap_SeniorNotesCurrent
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes715Due2018Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember
1,000,000us-gaap_SeniorNotesCurrent
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes715Due2018Member
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Maturity date   2018      
Bridge Loan [Member]          
Debt Instrument [Line Items]          
Variable rate (1.515% at December 31, 2014) bridge facility, due December 2015 4,500,000,000us-gaap_BridgeLoan
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember
4,500,000,000us-gaap_BridgeLoan
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember
4,500,000,000us-gaap_BridgeLoan
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember
   
Term loan, maturity date   2015-12      
Term loan, variable interest rate     1.515%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember
   
Senior Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of debt 2,200,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Senior Notes [Member] | 7.35% Senior Notes due 2017 [Member]          
Debt Instrument [Line Items]          
Senior notes   15,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
15,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Stated interest rate   7.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date   2017      
Senior Notes [Member] | 7.125% Senior Notes due 2017 [Member]          
Debt Instrument [Line Items]          
Senior notes   25,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes7125Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
25,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes7125Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Stated interest rate   7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes7125Due2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date   2017      
Senior Notes [Member] | 7.15% Senior Notes due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   27,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes715Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
27,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes715Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Stated interest rate   7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes715Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date   2018      
Senior Notes [Member] | 3.3% Senior Notes due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes 350,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes33Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
350,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes33Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Stated interest rate 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes33Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes33Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date 2018 2018      
Senior Notes [Member] | 7.5% Senior Notes Due 2018 [Member]          
Debt Instrument [Line Items]          
Senior notes   600,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes75Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
600,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes75Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Stated interest rate   7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes75Due2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date   2018      
Senior Notes [Member] | 4.05% Senior Notes due 2020 [Member]          
Debt Instrument [Line Items]          
Senior notes 850,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes405Due2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
850,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes405Due2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Stated interest rate 4.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes405Due2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
4.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes405Due2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date 2020 2020      
Senior Notes [Member] | 4.10% Senior Notes Due 2022 [Member]          
Debt Instrument [Line Items]          
Senior notes   1,000,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes410Due2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
1,000,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes410Due2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Stated interest rate   4.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes410Due2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date   2022      
Senior Notes [Member] | 4.95% Senior Notes due 2025 [Member]          
Debt Instrument [Line Items]          
Senior notes 1,000,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes495Due2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
1,000,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes495Due2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Stated interest rate 4.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes495Due2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
4.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes495Due2025Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Maturity date 2025 2025      
Unsecured Debt [Member] | Term Loan [Member]          
Debt Instrument [Line Items]          
Variable rate (1.680% and 1.545% at March 31, 2015 and December 31, 2014, respectively) term loan facility, due December 2016   $ 500,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 500,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 500,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
$ 500,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
Term loan, maturity date     2016-12 2016-12  
Term loan, variable interest rate   1.68%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
1.545%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember