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Earnings Per Share (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Proceeds from issuance of shares $ 2,300,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity    
Preferred stock, dividend rate     6.25%us-gaap_PreferredStockDividendRatePercentage
Preferred stock, liquidation preference per share $ 1,000us-gaap_PreferredStockLiquidationPreference   $ 1,000us-gaap_PreferredStockLiquidationPreference
Bridge Loan [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Bridge loan 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
Debt instrument, term 364 days 364 days 364 days
Common Stock [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued 30,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Share price $ 23.00us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Proceeds from issuance of shares 669,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Depositary Shares [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued 34,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
   
Proceeds from issuance of shares 1,700,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
   
Depositary shares conversion rate 0.05swn_DepositarySharesConversionRate
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
   
Preferred stock, liquidation preference per share $ 50us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
   
Convertible Preferred Stock [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Trading day period     20 days
Senior Notes [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Proceeds from issuance of debt $ 2,200,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Minimum [Member] | Depositary Shares [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued upon conversion     1.85014us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
Minimum [Member] | Convertible Preferred Stock [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued upon conversion     37.0028us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
Maximum [Member] | Depositary Shares [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued upon conversion     2.17391us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= swn_DepositarySharesMember
Maximum [Member] | Convertible Preferred Stock [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Shares issued upon conversion     43.4782us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember