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COMMITMENTS AND CONTINGENCIES (Details)
Mar. 31, 2015
Commitments and Contingencies [Line Items]  
Number Of Former Manufactured Gas Sites Where We Own Or Retain Legal Responsibility For Environmental Conditions 12ogs_NumberOfFormerManufacturedGasSitesWhereWeOwnOrRetainLegalResponsibilityForEnvironmentalConditions
Number of sites where we have completed or addressed removal of the source of soil contamination according to plans approved by KDHE 11ogs_NumberofsiteswherewehavecompletedoraddressedremovalofthesourceofsoilcontaminationaccordingtoplansapprovedbyKDHE.
Number of sites where regulatory closure has been achieved 3ogs_NumberOfSitesWhereRegulatoryClosureHasBeenAchieved
Percentage yield of high consequence pipeline areas 30.00%ogs_Percentageyieldofhighconsequencepipelineareas