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Short-Term Debt and Credit Facilities
 12 Months Ended
Dec. 31, 2012
Short-term Debt [Abstract]  
Short-Term Debt and Credit Facilities
Short-Term Debt and Credit Facilities
 
The Company borrows on a short-term basis, as necessary, by the issuance of commercial paper and by borrowings under its revolving credit agreements.  The short-term debt balance was $430.9 million and $277.1 million at December 31, 2012 and 2011, respectively, at a weighted-average interest rate of 0.43 percent and 0.48 percent, respectively.  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.

The Company's ability to access the commercial paper market could be adversely impacted by a credit ratings downgrade or major market disruptions. Pricing grids associated with the Company's credit facilities could cause annual fees and borrowing rates to increase if an adverse rating impact occurs. The impact of any future downgrade could include an increase in the costs of the Company's short-term borrowings, but a reduction in the Company's credit ratings would not result in any defaults or accelerations. Any future downgrade could also lead to higher long-term borrowing costs and, if below investment grade, would require the Company to post collateral or letters of credit. 
 
OG&E must obtain regulatory approval from the FERC in order to borrow on a short-term basis.  OG&E has the necessary regulatory approvals to incur up to $800 million in short-term borrowings at any one time for a two-year period beginning January 1, 2013 and ending December 31, 2014.