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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common Stock, Value | $ 2.0 | $ 2.0
Premium on common stock | 1,165.9 | 1,143.1
Retained earnings | 3,475.7 | 3,373.7
Accumulated other comprehensive loss, net of tax | (2.7) | (7.2)
Total stockholder's equity | 4,640.9 | 4,511.6
Unamortized debt expense | (32.9) | (27.9)
Unamortized discount | (5.9) | (11.2)
Total long-term debt | 5,053.3 | 4,340.5
Less: long-term debt due within one year | (32.4) | 0.0
Total long-term debt (excluding long-term debt due within one year) | 5,020.9 | 4,340.5
Total capitalization (including long-term debt due within one year) | 9,661.8 | 8,852.1
Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common Stock, Value | 100.9 | 100.9
Premium on common stock | 1,488.6 | 1,476.8
Retained earnings | 3,736.9 | 3,397.0
Total stockholder's equity | 5,326.4 | 4,974.7
Unamortized debt expense | (29.9) | (27.8)
Unamortized discount | (5.5) | (11.2)
Total long-term debt | 4,646.7 | 4,290.6
Less: long-term debt due within one year | (32.4) | 0.0
Total long-term debt (excluding long-term debt due within one year) | 4,614.3 | 4,290.6
Total capitalization (including long-term debt due within one year) | 9,940.7 | 9,265.3
Senior Notes [Member] | Series Due May 15, 2029 [Member] | OGE Energy [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 350.0 | 0.0
Senior Notes [Member] | Series Due July 15, 2027 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 125.0 | 125.0
Senior Notes [Member] | Series Due April 15, 2028 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 100.0 | 100.0
Senior Notes [Member] | Series Due August 15, 2028 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 400.0 | 400.0
Senior Notes [Member] | Series Due March 15, 2030 | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 300.0 | 300.0
Senior Notes [Member] | Series Due April 1, 2030 | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 300.0 | 300.0
Senior Notes [Member] | Series Due January 15, 2033 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 450.0 | 450.0
Senior Notes [Member] | Series Due January 15, 2036 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 110.0 | 110.0
Senior Notes [Member] | Series Due February 1, 2038 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 200.0 | 200.0
Senior Notes [Member] | Series Due June 1, 2040 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 250.0 | 250.0
Senior Notes [Member] | Series Due May 15, 2041 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 250.0 | 250.0
Senior Notes [Member] | Series Due May 1, 2043 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 250.0 | 250.0
Senior Notes [Member] | Series Due March 15, 2044 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 250.0 | 250.0
Senior Notes [Member] | Series Due December 15, 2044 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 250.0 | 250.0
Senior Notes [Member] | Series due April 1, 2047 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 300.0 | 300.0
Senior Notes [Member] | Series due August 15, 2047 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 300.0 | 300.0
Senior Notes [Member] | Series Due April 1, 2053 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 700.0 | 350.0
Term Loan [Member] | Due May 24, 2027 | OGE Energy [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 60.0 | 50.0
Long-term Debt [Member] | Due August 31, 2062 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 11.7 | 9.2
Debentures Subject to Mandatory Redemption [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Total long-term debt | 135.4 |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 32.4 | 32.4
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | 56.0 | 56.0
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority Bond [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 47.0 | $ 47.0

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