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Organization And Summary Of Significant Accounting Policies (Schedule Of Supplemental Disclosures Of Cash Flow Information) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Organization And Summary Of Significant Accounting Policies [Abstract]      
Cash paid during the year for interest, net of amounts capitalized $ 50us-gaap_InterestPaidNet $ 36us-gaap_InterestPaidNet $ 17us-gaap_InterestPaidNet
Cash paid during the year for income taxes 28us-gaap_IncomeTaxesPaid 19us-gaap_IncomeTaxesPaid 1us-gaap_IncomeTaxesPaid
Increase (decrease) in noncash property additions $ 174swn_IncreaseDecreaseInNoncashPropertyAdditions $ (13)swn_IncreaseDecreaseInNoncashPropertyAdditions $ (26)swn_IncreaseDecreaseInNoncashPropertyAdditions