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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income attributable to OGE Energy $ 416.8 $ 665.7 $ 737.3
Basic Average Common Shares Outstanding 200.3 200.2 200.1
Contingently Issuable Shares (Performance and Restricted Stock Units) 0.6 0.6 0.2
Diluted Average Common Shares Outstanding 200.9 200.8 200.3
Basic earnings per average common share $ 2.08 $ 3.33 $ 3.68
Diluted earnings per average common share $ 2.07 $ 3.32 $ 3.68
Anti-dilutive shares excluded from earnings per share calculation 0.0 0.0 0.0
Retained Earnings [Member]      
Net income attributable to OGE Energy $ 416.8 $ 665.7 $ 737.3