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Investment in Unconsolidated Affiliates (Details) (USD $) In Millions, unless otherwise specified | 5 Months Ended |
--- | --- | ---
Sep. 30, 2013 | May 01, 2013
Value of Midstream Operations Assets or Equity Acquired |  |  | $ 50
Line of Credit Facility, Maximum Borrowing Capacity | 1,150.0 |  |
Value of Aggregate Midstream Operations Assets or Equity Acquired by Parties Not Offered in Midstream Partnership |  |  | 100
Enogex LLC [Member] |  |  |
Percentage of Enogex LLC Contributed |  |  | 100.00%
Line of Credit Facility, Maximum Borrowing Capacity | 400.0 | [1] |
Southeast Supply Header, LLC [Member] |  |  |
Percentage of Subsidiary Contributed |  |  | 24.95%
ArcLight group [Member] |  |  |
Contributions to Pay Down Short-Term Debt |  |  | 107.0
OGE Holdings [Member] |  |  |
Contributions to Pay Down Short-Term Debt |  |  | 9.1
OGE Energy [Member] |  |  |
Percentage Share of Management Rights |  |  | 50.00%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest | 28.50% |  |
Percent of Incentive Distribution Rights |  |  | 60.00%
Midstream Partnership [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 1,400.0
CenterPoint [Member] |  |  |
Percentage Share of Management Rights |  |  | 50.00%
Percent of Incentive Distribution Rights |  |  | 40.00%
[1] | This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.

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