Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value, by Balance Sheet Grouping [Table Text Block]

The following table presents OGE Energy's financial instrument measured at fair value on a recurring basis and the carrying amount and fair value of the Registrants' financial instruments at December 31, 2021 and 2020, as well as the classification level within the fair value hierarchy.


	2021				2020
December 31 (In millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Classification
Financial instrument measured at fair value on a recurring basis:
OGE Energy investment in Energy Transfer's equity securities	$	785.1	$	785.1	(A)		(A)		Level 1

Financial instruments for which fair value is only disclosed:
Long-term Debt (including Long-term Debt due within one year):
OGE Energy Senior Notes	$	499.9	$	497.8	$	—	$	—	Level 2
OG&E Senior Notes	$	3,851.8	$	4,460.2	$	3,349.6	$	4,182.1	Level 2
OG&E Industrial Authority Bonds	$	135.4	$	135.4	$	135.4	$	135.4	Level 2
Tinker Debt	$	9.3	$	10.0	$	9.4	$	10.7	Level 3

(A)OGE Energy's ownership of Energy Transfer securities was effective as of December 2, 2021; therefore, the investment in Energy Transfer's equity securities was not held at December 31, 2020.