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Short-Term Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2016
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 December 31, 2016.
 
Aggregate
Amount
Weighted-Average
 
 
Entity
Commitment 
Outstanding (A)
Interest Rate
Expiration
 
(In millions)
 
 
 
 
OGE Energy (B)
$
750.0

$
236.2

0.95
%
(D)
December 13, 2018
(E)
OG&E (C)
400.0

1.8

0.95
%
(D)
December 13, 2018
(E)
Total
$
1,150.0

$
238.0

0.95
%
 
 
 
(A)
Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2016.
(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.  
(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.  
(D)
Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
(E)
In December 2011, OGE Energy and OG&E entered into unsecured revolving credit agreements in the aggregate of $1,150.0 million ($750.0 million for OGE Energy and $400.0 million for OG&E) which expire in December 2018. OGE Energy and OG&E expect to replace the existing agreements with new revolving credit agreements during 2017, under terms and conditions generally similar to the existing agreements.