Report of Business Segments - Summary of OGE Energy's Business Segments (Details) - USD ($) $ in Millions		11 Months Ended		12 Months Ended
	Dec. 02, 2021	Dec. 02, 2021	[1]	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Operating revenues				$ 3,375.7	$ 3,653.7	$ 2,122.3
Fuel, purchased power and direct transmission expense				1,662.4	2,127.6	644.6
Other operation and maintenance				501.4	463.1	462.8
Depreciation and amortization				460.9	416.0	391.3
Taxes other than income				101.5	102.8	101.4
OPERATING INCOME				649.5	544.2	522.2
Equity in earnings of unconsolidated affiliates		$ 169.8		0.0	169.8	(668.0)	[1],[2]
Gain on Enable/Energy Transfer transaction, net				0.0	344.4	0.0
Gain on equity securities				282.1	(8.6)	0.0
Other income (expense)				24.0	(21.6)	3.2
Interest expense				166.3	158.3	158.5
Income tax expense (benefit)				123.6	141.2	(127.4)
NET INCOME (LOSS)				665.7	737.3	(173.7)
Investment in unconsolidated affiliates						374.3
Total assets				12,544.7	12,606.4	10,718.8
Capital expenditures				1,050.9	778.5	650.5
Electric Company [Member]
Segment Reporting Information [Line Items]
Operating revenues				3,375.7	3,653.7	2,122.3
Fuel, purchased power and direct transmission expense				1,662.4	2,127.6	644.6
Other operation and maintenance				491.9	464.7	464.4
Depreciation and amortization				460.9	416.0	391.3
Taxes other than income				98.0	99.3	97.2
OPERATING INCOME				662.5	546.1	524.8
Equity in earnings of unconsolidated affiliates					0.0	0.0
Gain on Enable/Energy Transfer transaction, net					0.0
Gain on equity securities				0.0
Other income (expense)				11.2	7.7	4.1
Interest expense				157.8	152.0	154.8
Income tax expense (benefit)				76.4	41.8	34.7
NET INCOME (LOSS)				439.5	360.0	339.4
Investment in unconsolidated affiliates						0.0
Total assets				12,410.5	11,688.0	10,489.0
Capital expenditures				1,050.9	778.5	650.5
Natural Gas Midstream Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues				0.0	0.0	0.0
Fuel, purchased power and direct transmission expense				0.0	0.0	0.0
Other operation and maintenance				12.6	1.6	1.7
Depreciation and amortization				0.0	0.0	0.0
Taxes other than income				0.1	0.2	0.4
OPERATING INCOME				(12.7)	(1.8)	(2.1)
Equity in earnings of unconsolidated affiliates					169.8	(668.0)	[2]
Gain on Enable/Energy Transfer transaction, net					344.4
Gain on equity securities				282.1
Other income (expense)				10.0	(26.4)	(2.9)
Interest expense				0.0	0.0	0.0
Income tax expense (benefit)				48.1	101.0	(158.0)
NET INCOME (LOSS)				231.3	385.0	(515.0)
Investment in unconsolidated affiliates						374.3
Total assets				1.2	786.6	378.1
Capital expenditures				0.0	0.0	0.0
Other Operations [Member]
Segment Reporting Information [Line Items]
Operating revenues				0.0	0.0	0.0
Fuel, purchased power and direct transmission expense				0.0	0.0	0.0
Other operation and maintenance				(3.1)	(3.2)	(3.3)
Depreciation and amortization				0.0	0.0	0.0
Taxes other than income				3.4	3.3	3.8
OPERATING INCOME				(0.3)	(0.1)	(0.5)
Equity in earnings of unconsolidated affiliates					0.0	0.0
Gain on Enable/Energy Transfer transaction, net					0.0
Gain on equity securities				0.0
Other income (expense)				4.9	(2.0)	3.6
Interest expense				10.6	7.2	5.3
Income tax expense (benefit)				(0.9)	(1.6)	(4.1)
NET INCOME (LOSS)				(5.1)	(7.7)	1.9
Investment in unconsolidated affiliates						0.0
Total assets				683.7	350.3	116.4
Capital expenditures				0.0	0.0	0.0
OGE Energy [Member]
Segment Reporting Information [Line Items]
Gain on Enable/Energy Transfer transaction, net	$ 344.4
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating revenues				0.0	0.0	0.0
Fuel, purchased power and direct transmission expense				0.0	0.0	0.0
Other operation and maintenance				0.0	0.0	0.0
Depreciation and amortization				0.0	0.0	0.0
Taxes other than income				0.0	0.0	0.0
OPERATING INCOME				0.0	0.0	0.0
Equity in earnings of unconsolidated affiliates					0.0	0.0
Gain on Enable/Energy Transfer transaction, net					0.0
Gain on equity securities				0.0
Other income (expense)				(2.1)	(0.9)	(1.6)
Interest expense				(2.1)	(0.9)	(1.6)
Income tax expense (benefit)				0.0	0.0	0.0
NET INCOME (LOSS)				0.0	0.0	0.0
Investment in unconsolidated affiliates						0.0
Total assets				(550.7)	(218.5)	(264.7)
Capital expenditures				$ 0.0	$ 0.0	$ 0.0

[1] For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on an equity method investment, which 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.

[2] In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable