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Rate Matters and Regulation - Additional Information (Details) |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 30, 2024 USD ($) | Dec. 29, 2023 USD ($) | Dec. 28, 2023 USD ($) | Nov. 21, 2023 USD ($) | Oct. 02, 2023 USD ($) | Jul. 12, 2023 USD ($) Turbine Megawattsday | May 31, 2023 USD ($) Megawattsday Turbine | Feb. 01, 2023 USD ($) | Dec. 31, 2023 USD ($) | Nov. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Estimated Refund to SPP |  |  |  |  |  |  |  |  | $ 13,000,000 |  |
Regulatory assets |  |  |  |  |  |  |  |  | 577,600,000 |  | $ 524,300,000
Requested Recovery of Capital Investment |  |  |  |  |  |  |  |  | 1,300,000,000 |  |
Settlement Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Approximate deduction in average monthly residential bill expected |  |  |  |  |  |  |  |  |  | $ 21 |
Impact to Company [Member] |  |  |  |  |  |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  |  |  |  | 5,000,000 |  |
Customer Impact [Member] |  |  |  |  |  |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  |  |  |  | $ 8,000,000 |  |
Oklahoma Corporation Commission [Member] |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  | 86.00% |  |
Arkansas Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  | 8.00% |  |
Increase (decrease) in revenue requirement rose amount | $ 3,500,000 |  | $ 3,500,000 |  |  |  |  |  |  |  |
Federal Energy Regulatory Commission [Member] |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  | 6.00% |  |
OKLAHOMA |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 332,500,000 |  |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  | 10.50% |  |  |  |  |  |  |  |  |
Common Equity Percentage which ROE is based |  | 53.50% |  |  |  |  |  |  |  |  |
ARKANSAS |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  | $ 4,700,000 |  |  | $ 9,600,000 |  |  |
Horseshoe Lake [Member] |  |  |  |  |  |  |  |  |  |  |
Number of hydrogen capable combustion turbines | Turbine |  |  |  |  |  | 2 | 2 |  |  |  |
Current energy generation capacity | Megawattsday |  |  |  |  |  | 448 | 448 |  |  |  |
Approximate construction cost of turbines excluding financing costs and property taxes |  |  |  |  |  | $ 331,000,000 | $ 331,000,000 |  |  |  |
Recovery of jurisdictional portion of expenses plus financing costs and property taxes |  |  |  | $ 275,000,000 |  |  |  |  |  |  |
Winter Storm Uri Costs [Member] | ARKANSAS |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  | $ 71,000,000 |  | $ 78,200,000

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