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Short-Term Debt and Credit Facilities (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017.
 
Aggregate
Amount
Weighted-Average
 
 
Entity
Commitment 
Outstanding (A)
Interest Rate
 
Expiration
(In millions)
 
 
 
 
OGE Energy (B)
$
450.0

$
193.2

1.45
%
(D)
March 8, 2022
OG&E (C)
450.0

160.3

1.92
%
(D)
March 8, 2022
Total
$
900.0

$
353.5

1.66
%
 
 
(A)
Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2017.
(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. At June 30, 2017, $160.0 million in outstanding borrowings under the revolving credit facility was classified as Long-term Debt in the Company's Condensed Consolidated Balance Sheet.   
(D)
Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.