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Debt (Components Of Debt) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 19, 2014
Debt Instrument [Line Items]      
Total short-term debt $ 4,501,000,000us-gaap_ShortTermBorrowings $ 1,000,000us-gaap_ShortTermBorrowings  
Senior notes 2,200,000,000us-gaap_SeniorLongTermNotes    
Unamortized discount (1,000,000)us-gaap_DebtInstrumentUnamortizedDiscount (1,000,000)us-gaap_DebtInstrumentUnamortizedDiscount  
Long-term debt 2,466,000,000us-gaap_LongTermDebtNoncurrent 1,950,000,000us-gaap_LongTermDebtNoncurrent  
Total debt 6,967,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount 1,951,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount  
Credit Facility [Member]      
Debt Instrument [Line Items]      
Variable rate (1.50% and 1.64% at September 30, 2014 and December 31, 2013, respectively) Credit Facility, expires December 2018 300,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
283,000,000us-gaap_LongTermLineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Credit facility, variable interest rate 1.515%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
1.64%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Credit facility, maturity date Dec. 01, 2018    
7.35% Senior Notes due 2017 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 7.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes735Due2017Member
   
Maturity date 2017    
7.125% Senior Notes due 2017 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes7125Due2017Member
   
Maturity date 2017    
7.5% Senior Notes Due 2018 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes75Due2018Member
   
Maturity date 2018    
4.10% Senior Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 4.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= swn_SeniorNotes410Due2022Member
   
Maturity date 2022    
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
 
Stated interest rate 7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ 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
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] | 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
28,000,000us-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] | 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
 
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
 
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
 
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
 
Unsecured Debt [Member] | Term Loan [Member]      
Debt Instrument [Line Items]      
Variable rate (1.545% at December 31, 2014) 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
Term loan, maturity date 2016-12    
Term loan, variable interest rate 1.545%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_DebtInstrumentAxis
= swn_TermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember