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v3.10.0.1

EQUITY (Details) - Subsequent Event [Member] | 3 Months Ended
--- | ---
Sep. 30, 2018 $ / shares
Common Stock, Dividends, Per Share, Declared | $ 0.46
Common Stock, Dividends, Declared, Annualized Basis | $ 1.84

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- Definition Dividends declared during the period for each share of common stock outstanding, on an annualized basis. + References No definition available. + Details
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Namespace Prefix: | ogs_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Balance Type: |
Period Type: |