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Short-Term Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018.
 
Aggregate
Amount
Weighted-Average
 
 
Entity
Commitment 
Outstanding (A)
Interest Rate
Expiration
 
(In millions)
 
 
 
 
OGE Energy (B)
$
450.0

$
—

—
%
(D)
March 8, 2023
(E)
OG&E (C)
450.0

0.3

1.05
%
(D)
March 8, 2023
(E)
Total
$
900.0

$
0.3

1.05
%
 
 
 
(A)
Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2018.
(B)
This bank facility is available to back up the Company'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 March 2017, the Company and OG&E entered into unsecured five-year revolving credit agreements totaling $900.0 million ($450.0 million for the Company and $450.0 million for OG&E). Each of the facilities contained an option, which could be exercised up to two times, to extend the term of the respective facility for an additional year. Effective March 9, 2018, the Company and OG&E utilized one of those extensions to extend the maturity of their respective credit facility from March 8, 2022 to March 8, 2023.