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Increase in fair value of net assets

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Percentage of Enogex LLC Contributed

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Percentage of Subsidiary Contributed

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Percentage Share of Management Rights

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Percent of Incentive Distribution Rights

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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Change in the number of units for each class of partners' capital accounts during the year due to acquisitions. Partners include general, limited and preferred partners.

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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.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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Investment in Unconsolidated Affiliate and Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended	8 Months Ended	1 Months Ended	3 Months Ended	7 Months Ended
	May 31, 2014	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	May 30, 2014	Mar. 31, 2014	Dec. 31, 2014	May 01, 2013	May 13, 2014
Schedule of Equity Method Investments [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest		6.00%
Partners' Capital Account, Units, Acquisitions	6,322,457
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity			$ 1,000.0				1,000.0
Enable Midstream Partners [Member]
Schedule of Equity Method Investments [Line Items]
Partners' Capital Account, Units, Sold in Public Offering		25,000,000
Proceeds from Issuance Initial Public Offering		464.0
Distributions received			143.7
Enogex LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Enogex LLC Contributed								100.00%
Increase in fair value of net assets				2,200.0
Southeast Supply Header, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Subsidiary Contributed									24.95%
ArcLight group [Member]
Schedule of Equity Method Investments [Line Items]
Contributions to Pay Down Short-Term Debt								107.0
Partners' Capital Account, Units, Sold in Public Offering		3,750,000
OGE Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Contributions to Pay Down Short-Term Debt								9.1
OGE Energy [Member]
Schedule of Equity Method Investments [Line Items]
Percentage Share of Management Rights			50.00%				50.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest					26.70%	28.50%	26.30%
Percent of Incentive Distribution Rights			60.00%				60.00%
CenterPoint [Member]
Schedule of Equity Method Investments [Line Items]
Percentage Share of Management Rights			50.00%				50.00%
Percent of Incentive Distribution Rights			40.00%				40.00%