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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |
Treasury Stock Acquired, Repurchase Authorization | $ 20 ogs_TreasuryStockAnnualAuthorizedAmount |  |
Common stock, shares authorized | 250,000,000 us-gaap_CommonStockSharesAuthorized |  | 250,000,000 us-gaap_CommonStockSharesAuthorized
Number of natural gas distribution services customers | 2,000,000 ogs_NumberOfNaturalGasDistributionServicesCustomers |  |
Segment Reporting, Disclosure of Major Customers | 0 | 0 |

X
- Definition Number of customers the natural gas distribution service segment services. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Definition The annual authorized limit of treasury stock purchases, exclusive of funds received through the dividend reinvestment and employee stock purchase plans. + References No definition available. + Details
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X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 + Details
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