Common Equity - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net income attributable to OGE Energy	$ 665.7	$ 737.3	$ (173.7)
Basic Average Common Shares Outstanding	200.2	200.1	200.1
Contingently Issuable Shares (Performance and Restricted Stock Units)	0.6	0.2	0.0
Diluted Average Common Shares Outstanding	200.8	200.3	200.1
Basic earnings (loss) per average common share	$ 3.33	$ 3.68	$ (0.87)
Diluted earnings (loss) per average common share	$ 3.32	$ 3.68	$ (0.87)
Anti-dilutive shares excluded from earnings per share calculation	0.0	0.0	0.3
Og and E [Member]
Net income attributable to OGE Energy	$ 439.5	$ 360.0	$ 339.4
Retained Earnings [Member]
Net income attributable to OGE Energy	665.7	737.3	(173.7)
Retained Earnings [Member] | Og and E [Member]
Net income attributable to OGE Energy	$ 439.5	$ 360.0	$ 339.4