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COMMITMENTS AND CONTINGENCIES - Part 2 (Details)
Dec. 31, 2014
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 Soil Remediation Is Completed Or Near Completion 11ogs_NumberOfSitesSoilRemediationIsCompletedOrNearCompletion
Number of sites where regulatory closure has been achieved 3ogs_NumberOfSitesWhereRegulatoryClosureHasBeenAchieved
Percentage yield of high consequence pipeline areas 30.00%ogs_Percentageyieldofhighconsequencepipelineareas