Summary of Significant Accounting Policies Property - Summary of Property Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2022		Dec. 31, 2021
Public Utility, 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
OG&E [Member]
Public Utility, 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 Generation Equipment [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	5,188.1	[1]	5,037.9	[2]
Accumulated Depreciation	1,982.7	[1]	1,839.0	[2]
Net property, plant and equipment	3,205.4	[1]	3,198.9	[2]
OG&E [Member] | Electric Transmission [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	3,180.5	[3]	3,038.2	[4]
Accumulated Depreciation	667.9	[3]	627.0	[4]
Net property, plant and equipment	2,512.6	[3]	2,411.2	[4]
OG&E [Member] | Finite-Lived Intangible Assets, Major Class Name [Member]
Public Utility, 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]
Public Utility, 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
OG&E [Member] | Total Property Plant and Equipment [Member]
Public Utility, 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
OGE Energy [Member]
Public Utility, 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

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

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

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

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