Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Regulatory Assets and Liabilities [Table Text Block]

The following table presents a summary of OG&E's regulatory assets and liabilities.

	June 30,		December 31,
(In millions)	2022		2021
REGULATORY ASSETS
Current:
Oklahoma Winter Storm Uri costs (A)	$	750.5	$	—
Fuel clause under recoveries	271.7		151.9
SPP cost tracker under recovery (A)	8.1		9.3
Oklahoma Energy Efficiency Rider under recoveries (A)	—		11.7
Other (A)	10.7		9.7
Total current regulatory assets	$	1,041.0	$	182.6
Non-current:
Oklahoma Winter Storm Uri costs	$	—	$	747.9
Oklahoma deferred storm expenses	210.5		172.8
Benefit obligations regulatory asset	101.0		109.2
Arkansas Winter Storm Uri costs	83.9		88.9
Pension tracker	45.7		42.9
Sooner Dry Scrubbers	18.5		18.9
Arkansas deferred pension expenses	12.1		12.1
Unamortized loss on reacquired debt	8.5		8.9
COVID-19 impacts	8.3		8.2
Frontier Plant deferred expenses	6.0		6.7
Smart Grid	0.4		3.9
Other	10.2		10.4
Total non-current regulatory assets	$	505.1	$	1,230.8
REGULATORY LIABILITIES
Current:
Other (B)	$	4.6	$	2.5
Total current regulatory liabilities	$	4.6	$	2.5
Non-current:
Income taxes refundable to customers, net	$	918.5	$	930.7
Accrued removal obligations, net	283.7		296.8
Other	3.1		3.6
Total non-current regulatory liabilities	$	1,205.3	$	1,231.1

(A)Included in Other Current Assets in the condensed balance sheets. The Oklahoma Winter Storm Uri regulatory asset was reclassified as current at June 30, 2022, in anticipation of the securitization process being completed in July 2022 and OG&E receiving funds from the ODFA.

(B)Included in Other Current Liabilities in the condensed balance sheets.

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following tables present changes in the components of accumulated other comprehensive income (loss) attributable to OGE Energy during the six months ended June 30, 2022 and 2021. All amounts below are presented net of tax.

(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans		Total
Balance at December 31, 2021	$	(26.1)	$	1.3	$	(24.8)
Other comprehensive income (loss) before reclassifications	—		—		—
Amounts reclassified from accumulated other comprehensive income	0.6		—		0.6
Settlement cost	8.1		—		8.1
Balance at June 30, 2022	$	(17.4)	$	1.3	$	(16.1)

(In millions)	Pension Plan and Restoration of Retirement Income Plan		Postretirement Benefit Plans		Other Comprehensive Gain (Loss) from Unconsolidated Affiliates		Total
Balance at December 31, 2020	$	(34.1)	$	3.3	$	(1.3)	$	(32.1)
Other comprehensive income before reclassifications	—		—		0.3		0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.8		(0.6)		—		0.2
Settlement cost	3.7		—		—		3.7
Balance at June 30, 2021	$	(29.6)	$	2.7	$	(1.0)	$	(27.9)

Schedule of Amounts Reclassified out of Accumulated Other Comprehensive Income [Table Text Block]

The following table presents significant amounts reclassified out of accumulated other comprehensive income (loss) attributable to OGE Energy by the respective line items in net income during the three and six months ended June 30, 2022 and 2021.

Details about Accumulated Other Comprehensive Income (Loss) Components	Amount Reclassified from Accumulated Other Comprehensive Income (Loss)								Affected Line Item in OGE Energy's Statements of Income
	Three Months Ended				Six Months Ended
	June 30,				June 30,
(In millions)	2022		2021		2022		2021
Amortization of Pension Plan and Restoration of Retirement Income Plan items:
Actuarial losses	$	(0.4)	$	(0.4)	$	(0.8)	$	(1.2)	(A)
Prior service cost	—		—		(0.1)		—		(A)
Settlement cost	(0.9)		(1.2)		(10.5)		(5.3)		(A)
	(1.3)		(1.6)		(11.4)		(6.5)		Income Before Taxes
	(0.4)		(0.8)		(2.7)		(2.0)		Income Tax Expense
	$	(0.9)	$	(0.8)	$	(8.7)	$	(4.5)	Net Income
Amortization of postretirement benefit plans items:
Prior service credit	$	—	$	0.5	$	—	$	0.9	(A)
Actuarial losses	—		(0.1)		—		(0.1)		(A)
	—		0.4		—		0.8		Income Before Taxes
	—		0.1		—		0.2		Income Tax Expense
	$	—	$	0.3	$	—	$	0.6	Net Income
Total reclassifications for the period, net of tax	$	(0.9)	$	(0.5)	$	(8.7)	$	(3.9)	Net Income

(A)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 11 for additional information).

Reconciliation of Equity in Earnings of Unconsolidated Affiliates [Table Text Block]

The following table presents a reconciliation of OGE Energy's equity in earnings of unconsolidated affiliates for the three and six months ended June 30, 2021.

(In millions)	Three Months Ended			Six Months Ended
Enable net income	$	79.0		$	234.0
OGE Energy's percent ownership at period end	25.5		%	25.5		%
OGE Energy's portion of Enable net income	$	20.0		$	59.5
Amortization of basis difference and dilution recognition (A)	13.5			27.2
Equity in earnings of unconsolidated affiliates	$	33.5		$	86.7

(A)Includes loss on dilution, net of proportional basis difference recognition.

Unrealized Gain (Loss) on Investments

Through the end of July 2022, OGE Energy has sold 73.3 million Energy Transfer limited partner units, resulting in pre-tax net proceeds of $812.6 million and a remaining ownership percentage of less than one percent based on the latest publicly available information filed by Energy Transfer.

(In millions)	Three Months Ended June 30, 2022		Six Months Ended June 30, 2022
Gain (loss) on equity securities	$	(39.6)	$	242.7
Net gain recognized on equity securities sold	6.7		175.7
Unrealized gain (loss) on equity securities held	$	(46.3)	$	67.0