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Investment in Unconsolidated Affiliate and Related Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | May. 13, 2014 | May. 01, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  | $ 775.5 |  |  |
Enable Midstream Partners [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Partners' Capital Account, Units, Sold in Public Offering | 25,000,000 |  |  |  |
Distributions received |  | $ 35.3 | $ 34.3 |  |
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% |
OGE Holdings [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Limited Partner Units Owned |  | 111,000,000 |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest |  | 26.30% |  |  |
Subordinated Units Held by Limited Partners of the LLC or LP |  | 68,200,000 |  |  |
Percent of Incentive Distribution Rights |  | 60.00% |  |  |
CenterPoint [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percent of Incentive Distribution Rights |  | 40.00% |  |  |

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