Summary of Significant Accounting Policies Equity Ownership (Details)	3 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2014	May 30, 2014 OGE Energy [Member]	Jun. 30, 2014 OGE Energy [Member]	Mar. 31, 2014 OGE Energy [Member]	Jun. 30, 2014 OGE Holdings [Member]	Jun. 30, 2014 CenterPoint [Member]	Jun. 30, 2014 Enable Midstream Partners [Member]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	6.00%	26.70%	26.30%	28.50%
Percent of Subordinated Limited Partner Units			61.40%			61.40%
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
Percent of Incentive Distribution Rights			60.00%			40.00%
Percentage Share of Management Rights			50.00%			50.00%
Partners' Capital Account, Units, Sold in Public Offering							25,000,000