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Short-Term Debt and Credit Facilities (Tables)
 6 Months Ended
Jun. 30, 2013
Short-term Debt [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
The following table provides information regarding the Company's revolving credit agreements at June 30, 2013.
 
Aggregate
 
Amount
Weighted-Average
 
 
 
Entity
Commitment 
 
Outstanding (A)
Interest Rate
 
Maturity
 
 
(In millions)
 
 
 
 
OGE Energy (B)
$
750.0

 
$
478.7

0.31
%
(E)
December 13, 2017
(F)
OG&E (C)
400.0

 
2.1

0.53
%
(E)
December 13, 2017
(F)
Total
$
1,150.0

(D)
$
480.8

0.31
%
 
 
 
(A)
Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2013.
(B)
This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings.  This bank facility can also be used as a letter of credit facility.  At June 30, 2013, there was $478.7 million in outstanding commercial paper borrowings.
(C)
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.  At June 30, 2013, there was $2.1 million supporting letters of credit.
(D)
Effective May 1, 2013, Enable Midstream Partners entered into a $1.4 billion, five-year senior unsecured revolving credit facility in accordance with the terms of the Master Formation Agreement and Enogex LLC's $400 million revolving credit facility was terminated.  
(E)
Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
(F)
In December 2011, the Company and OG&E entered into unsecured five-year revolving credit agreements to total in the aggregate 1,150.0 million ($750 million for the Company and $400 million for OG&E). Each of the credit facilities contain an option, which may be exercised up to two times, to extend the term for an additional year, subject to consent of a specified percentage of the lenders. Effective July 29, 2013, the Company and OG&E utilized one of these one-year extensions, and received consent from all of the lenders, to extend the maturity of their credit agreements to December 13, 2017.