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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping The following table presents the carrying amount and fair value of the Registrants' financial instruments at December 31, 2023 and 2022, as well as the classification level within the fair value hierarchy.

2023

 

 

2022

 

 

December 31 (In millions)

Carrying
Amount

 

Fair
Value

 

 

Carrying
Amount

 

Fair
Value

 

Classification

Long-term Debt (including Long-term Debt due within one year):

 

 

 

 

 

 

 

 

 

 

OGE Energy Senior Notes

$

—

 

$

—

 

 

$

499.9

 

$

491.2

 

Level 2

OGE Energy Term Loan

$

49.9

 

$

50.0

 

 

$

49.8

 

$

50.0

 

Level 2

OG&E Senior Notes

$

4,146.0

 

$

3,922.3

 

 

$

3,854.2

 

$

3,477.1

 

Level 2

OG&E Industrial Authority Bonds

$

135.4

 

$

135.4

 

 

$

135.4

 

$

135.4

 

Level 2

Tinker Debt

$

9.2

 

$

7.1

 

 

$

9.3

 

$

7.3

 

Level 3