CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Revenue from Contract with Customer, Excluding Assessed Tax	$ 3,588.7	[1]	$ 2,069.8		$ 2,175.5
Revenues from Alternative Revenue Programs	65.0		52.5		56.1
OPERATING REVENUES
Total operating revenues	3,653.7		2,122.3		2,231.6
Total cost of sales	2,127.6		644.6		786.9
OPERATING EXPENSES
Other operation and maintenance	463.1		462.8		491.8
Depreciation and amortization	416.0		391.3		355.0
Taxes other than income	102.8		101.4		93.6
Operating expenses	981.9		955.5		940.4
Operating income (loss)	544.2		522.2		504.3
OTHER INCOME (EXPENSE)
Equity in earnings (losses) of unconsolidated affiliates	169.8		(668.0)	[2],[3]	113.9	[2]
Allowance for equity funds used during construction	6.7		4.8		4.5
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	(6.1)		(3.9)		(9.8)
Equity Securities, FV-NI, Gain (Loss)	(8.6)		0.0		0.0
Other income	26.3		37.5		21.9
Gain (Loss) on Disposition of Assets	344.4		0.0		0.0
Other expense	(39.9)		(35.2)		(23.5)
Net other income (expense)	492.6		(664.8)		107.0
INTEREST EXPENSE
Interest on long-term debt	154.8		152.8		138.3
Allowance for borrowed funds used during construction	(3.5)		(1.9)		(2.8)
Interest on short-term debt and other interest charges	7.0		7.6		12.4
Interest expense	158.3		158.5		147.9
INCOME (LOSS) BEFORE TAXES	878.5		(301.1)		463.4
INCOME TAX EXPENSE (BENEFIT)	141.2		(127.4)		29.8
NET INCOME (LOSS)	$ 737.3		$ (173.7)		$ 433.6
BASIC AVERAGE COMMON SHARES OUTSTANDING	200.1		200.1		200.1
DILUTED AVERAGE COMMON SHARES OUTSTANDING	200.3		200.1		200.7
BASIC EARNINGS (LOSS) PER AVERAGE COMMON SHARE	$ 3.68		$ (0.87)		$ 2.17
DILUTED EARNINGS (LOSS) PER AVERAGE COMMON SHARE	3.68		(0.87)		2.16
DIVIDENDS DECLARED PER COMMON SHARE	$ 1.6250		$ 1.5800		$ 1.5050
Other Comprehensive Income (Loss), Net of Tax	$ 7.3		$ (4.2)		$ 1.0
Og and E [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	3,588.7		2,069.8		2,175.5
Revenues from Alternative Revenue Programs	65.0		52.5		56.1
OPERATING REVENUES
Total operating revenues	3,653.7		2,122.3		2,231.6
Total cost of sales	2,127.6		644.6		786.9
OPERATING EXPENSES
Other operation and maintenance	464.7		464.4		492.5
Depreciation and amortization	416.0		391.3		355.0
Taxes other than income	99.3		97.2		89.5
Operating expenses	980.0		952.9		937.0
Operating income (loss)	546.1		524.8		507.7
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	6.7		4.8		4.5
Pension and Other Postretirement Benefits Cost (Reversal of Cost)	(4.3)		(3.1)		(1.2)
Other income	7.1		5.0		6.7
Other expense	(1.8)		(2.6)		(6.9)
Net other income (expense)	7.7		4.1		3.1
INTEREST EXPENSE
Interest on long-term debt	152.7		152.8		138.3
Allowance for borrowed funds used during construction	(3.5)		(1.9)		(2.8)
Interest on short-term debt and other interest charges	2.8		3.9		5.0
Interest expense	152.0		154.8		140.5
INCOME (LOSS) BEFORE TAXES	401.8		374.1		370.3
INCOME TAX EXPENSE (BENEFIT)	41.8		34.7		20.1
Net Income (Loss) Attributable to Parent	360.0		339.4		350.2
Other Comprehensive Income (Loss), Net of Tax	0.0		0.0		0.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 360.0		$ 339.4		$ 350.2

[1] In February 2021, Winter Storm Uri resulted in record winter peak demand for electricity and extremely high natural gas and purchased power prices in OG&E's service territory. Operating revenues significantly increased due to increased fuel, purchased power and direct transmission expenses, which are generally recoverable from customers, as a result of Winter Storm Uri. For further discussion, see Note 16 and "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations."

[2] For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on its SESH equity method investment. Enable estimated the fair value of this equity method investment was below the carrying value at September 30, 2020 and concluded the decline in value was other than temporary due to the expiration of a transportation contract and the current status of renewal negotiations. The impairment ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above

[3] In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 5 and 7.