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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%