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Short-Term Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2012
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 and available cash at December 31, 2012.
Revolving Credit Agreements and Available Cash 
 
Aggregate
Amount
Weighted-Average
 
Entity
Commitment 
Outstanding (A)
Interest Rate
Maturity
 
(In millions)
 
 
 
OGE Energy (B)
$
750.0

$
430.9

0.43
%
(E)
December 13, 2016
OG&E (C)
400.0

2.2

0.53
%
(E)
December 13, 2016
Enogex LLC (D)
400.0

—

—
%
(E)
December 13, 2016
 
1,550.0

433.1

0.43
%
 
 
Cash
1.8

N/A

N/A

 
N/A
Total
$
1,551.8

$
433.1

0.43
%
 
 
(A)
Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2012.
(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 December 31, 2012, there was $430.9 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 December 31, 2012, there was $2.2 million supporting letters of credit.
(D)
This bank facility is available to provide revolving credit borrowings for Enogex LLC.  As Enogex LLC's credit agreement matures on December 13, 2016, along with its intent in utilizing its credit agreement, borrowings thereunder are classified as long-term debt in the Company's Consolidated Balance Sheets.
(E)
Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.