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Summary of Significant Accounting Policies Equity Ownership (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Jun. 30, 2014 | Mar. 31, 2014
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  | 6.90%
OGE Energy [Member] |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 26.70% | 28.50%
Percent of Subordinated Limited Partner Units |  | 61.40%
Percent of Incentive Distribution Rights |  | 60.00%
Percentage Share of Management Rights |  | 50.00%
OGE Holdings [Member] |  |
Units Held by Limited Partners of the LLC or LP. |  | 42,832,291
Subordinated Units Held by Limited Partners of the LLC or LP. |  | 68,150,514
CenterPoint [Member] |  |
Percent of Subordinated Limited Partner Units |  | 61.40%
Percent of Incentive Distribution Rights |  | 40.00%
Percentage Share of Management Rights |  | 50.00%
Enable Midstream Partners [Member] |  |
Partners' Capital Account, Units, Sold in Public Offering |  | 28,750,000
Proceeds from Issuance Initial Public Offering |  | $ 466.0

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- Definition The number of units or percentage investment held by one or more members or limited partners of the LLC or LP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 16 -Subparagraph a, b -Article 6 + Details
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- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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