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Rate Matters and Regulation - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
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Feb. 01, 2023 | Dec. 29, 2022 | Oct. 03, 2022 | Sep. 29, 2022 | Sep. 08, 2022 | Aug. 01, 2022 | Jul. 05, 2022 | Jul. 01, 2022 | May 18, 2022 | Feb. 01, 2022 | Apr. 01, 2021 | Jan. 31, 2023 | Dec. 31, 2021 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Jul. 31, 2022
Amortize and recovery of extraordinary fuel costs period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Pre-tax rate of return percentage |  |  |  |  |  |  |  |  |  |  | 6.60% |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  | $ 30,000,000.0 |  |  | $ 30,000,000.0 |  |  |  |  |  |  |  |  |
Recovery of regulatory asset period |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |
Repayment of securitization bonds period |  |  |  |  |  | 28 years |  |  |  |  |  |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,000,000.0 |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,230,800,000 |  | 524,300,000 | $ 1,230,800,000 |
Securitization Authorization Requested |  |  |  |  |  |  |  |  |  |  |  |  | 760,000,000.0 |  |  |  |
Securitization Authorization Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000
Plan Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000.0 |  |
Requested Recovery of Capital Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000,000 |  |
Common Equity Percentage which ROE is based |  |  |  |  | 53.37% |  |  |  |  |  |  |  |  |  |  |  |
Annualized filing year revenues percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Increase (Decrease) in Regulatory Clause Revenue |  |  |  | $ 424,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax weighted average cost of capital percentage |  |  |  |  |  |  |  |  |  |  |  | 6.49% |  |  |  |  |
Recovery of regulatory asset period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Revenue on Plant Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,200,000 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Revenue on Plant Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,900,000 |  |
In Favor Cooperatives [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,700,000 |  |
In Favor Cooperatives [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Revenues on Plant Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |  |
In Favor Cooperatives [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Revenues on Plant Investments for Customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |  |
Impact to Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000.0 |  |
Customer Impact [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Refund to SPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  |
Oklahoma Corporation Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88.00% |  |
Arkansas Public Service Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |
Federal Energy Regulatory Commission [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OG&E's Jurisdictional Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
OKLAHOMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 163,500,000 |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 10.20% |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.50% |  |
State corporate income tax adjustment rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  | 6.00% |
Common Equity Percentage which ROE is based |  |  |  |  |  |  |  |  |  |  |  |  | 53.37% |  |  |  |
ARKANSAS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  | $ 8,500,000 |  |  |  |  |  |  | $ 4,200,000 |  |  |  |  |  |  |
Increase (decrease) in revenue requirement rose amount |  | $ 9,600,000 | $ 9,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARKANSAS | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement rose amount | $ 9,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Winter Storm Uri Costs [Member] | OKLAHOMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 747,900,000 |  | $ 0 | $ 747,900,000 |
Winter Storm Uri Costs [Member] | ARKANSAS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,900,000 |  | 78,200,000 | $ 88,900,000 |
Grid Enhancement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs recovery of program implemented |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 |  |

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