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Summary of Significant Accounting Policies Equity Ownership (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2014 | Mar. 31, 2016 | Dec. 31, 2015
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  | $ 0.31800 |
Threshold for Per Unit Incentive Distributions |  |  | $ 0.330625
Incentive Distribution, Payments Made and Minimum Distribution Level |  |  | 50.00%
Enable Midstream Partners [Member] |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25,000,000 |  |
CenterPoint [Member] |  |  |
Percentage Share of Management Rights |  |  | 50.00%
Percent of Incentive Distribution Rights |  |  | 40.00%
OGE Energy [Member] |  |  |
Percentage Share of Management Rights |  |  | 50.00%
OGE Holdings [Member] |  |  |
Limited Partner Units Owned |  |  | 111,000,000
Subordinated Units Held by Limited Partners of the LLC or LP |  |  | 68,200,000
Percent of Incentive Distribution Rights |  |  | 60.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  |  | 26.30%

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