Summary of Significant Accounting Policies - Schedule of Jointly Owned Utility Plants (Details) - USD ($) $ in Millions	Dec. 31, 2022		Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 15,131.3		$ 14,151.8
Accumulated Depreciation	4,584.5		4,318.9
Net property, plant and equipment	$ 10,546.8		$ 9,832.9
McClain Plant [Member]
Property, Plant and Equipment [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	77.00%	[1]	77.00%	[2]
Property, Plant and Equipment, Gross	$ 261.9	[1]	$ 258.5	[2]
Accumulated Depreciation	119.4	[1]	109.0	[2]
Net property, plant and equipment	$ 142.5	[1]	$ 149.5	[2]
Redbud Plant [Member]
Property, Plant and Equipment [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	51.00%	[1],[3]	51.00%	[2],[4]
Property, Plant and Equipment, Gross	$ 542.1	[1],[3]	$ 538.2	[2],[4]
Accumulated Depreciation	225.2	[1],[3]	203.4	[2],[4]
Net property, plant and equipment	316.9	[1],[3]	334.8	[2],[4]
OGE Energy [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6.1		6.1
Accumulated Depreciation	0.0		0.0
Net property, plant and equipment	6.1		6.1
OG&E [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	15,125.2		14,145.7
Accumulated Depreciation	4,584.5		4,318.9
Net property, plant and equipment	10,540.7		9,826.8
OG&E [Member] | Total Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	15,125.2		14,145.7
Accumulated Depreciation	4,584.5		4,318.9
Net property, plant and equipment	10,540.7		9,826.8
OG&E [Member] | Electric Transmission and Distribution [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,781.3		5,225.8
Accumulated Depreciation	1,527.1		1,477.5
Net property, plant and equipment	4,254.2		3,748.3
OG&E [Member] | Electric Generation Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,188.1	[5]	5,037.9	[6]
Accumulated Depreciation	1,982.7	[5]	1,839.0	[6]
Net property, plant and equipment	3,205.4	[5]	3,198.9	[6]
OG&E [Member] | Electric Transmission [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,180.5	[7]	3,038.2	[8]
Accumulated Depreciation	667.9	[7]	627.0	[8]
Net property, plant and equipment	2,512.6	[7]	2,411.2	[8]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	384.0		301.1
Accumulated Depreciation	193.6		171.7
Net property, plant and equipment	190.4		129.4
OG&E [Member] | Property, Plant and Equipment, Other Types [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	591.3		542.7
Accumulated Depreciation	213.2		203.7
Net property, plant and equipment	$ 378.1		$ 339.0

[1] Construction work in progress was $0.7 million and $1.5 million for the McClain and Redbud Plants, respectively.

[2] Construction work in progress was $0.2 million and $0.2 million for the McClain and Redbud Plants, respectively.

[3] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.2 million.

[4] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.

[5] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $78.3 million.

[6] This amount includes a plant acquisition adjustment of $148.3 million and accumulated amortization of $72.8 million.

[7] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $1.0 million.

[8] This amount includes a plant acquisition adjustment of $3.3 million and accumulated amortization of $0.9 million.