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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Organization (Details) customer in Millions, $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Nov. 30, 2023 USD ($) MW | Dec. 31, 2022 USD ($) | Aug. 09, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | Oct. 01, 2021 USD ($) | May 31, 2023 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2023 customer kilovolt_line subsidiary mi MW | Dec. 31, 2022 USD ($) | Dec. 31, 2021 shares
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Owned generating capacity and renewable purchased power | MW |  |  |  |  |  |  |  | 15,600 |  |
Number of customers served | customer |  |  |  |  |  |  |  | 1.7 |  |
Antidilutive securities excluded from computation of earnings per share, amount | shares |  |  |  |  |  |  |  |  |  | 0
Asset Impairment Charges |  |  |  |  |  |  |  |  | $ 26.7 |
Increase of Natural Gas and Purchased Power Costs, Net Increase in Wholesale Revenues |  |  |  |  |  |  | $ 367.9 |  |  |
Cash settlements under share forward agreement |  |  |  |  |  |  |  |  | 15.1 |
Equity investment loss, net of derivative gain |  |  |  |  |  |  |  |  | $ 16.3 |
2022 Oklahoma Wind Farm Purchase |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Price of Acquisition, Expected |  |  | $ 250.0 |  |  |  |  |  |  |
ApproximateMWNameplateCapacity | MW |  |  | 199 |  |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  |  |  | $ 220.9 |  |  |  |
2024 Natural Gas Plant Purchase |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Price of Acquisition, Expected | $ 60.0 |  |  |  |  |  |  |  |  |
ApproximateMWNameplateCapacity | MW | 145 |  |  |  |  |  |  |  |  |
Evergy Kansas Central |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase of Natural Gas and Purchased Power Costs, Gross |  |  |  |  |  |  | 134.3 |  |  |
Increase of Energy Marketing Margins |  |  |  |  |  |  | 94.5 |  |  |
Prairie Wind Transmission, LLC |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Transmission line length | mi |  |  |  |  |  |  |  | 108 |  |
Transmission line electrical potential | kilovolt_line |  |  |  |  |  |  |  | 345 |  |
Evergy Missouri West |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase of Natural Gas and Purchased Power Costs, Gross |  |  |  |  |  |  | 296.6 |  |  |
Evergy Metro |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase in Wholesale Revenues |  |  |  |  |  |  | $ 63.0 |  |  |
Transource Energy, LLC | Evergy Transmission Company LLC |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 13.50% |  |
Prairie Wind Transmission, LLC | Evergy Kansas Central |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 50.00% |  |
Early-Stage Energy Solution Company |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Initial Investment On Equity Investment |  |  |  |  | $ 3.7 |  |  |  |  |
Unrealized Gain on Investments |  |  |  | $ 27.7 |  |  |  |  |  |
Equity investment loss, net of derivative gain |  | $ 16.3 |  |  |  |  |  |  |  |
Evergy Kansas South Inc | Evergy Kansas Central |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of active wholly owned subsidiaries | subsidiary |  |  |  |  |  |  |  | 1 |  |
AEP Transmission Holding Company, LLC | Transource Energy, LLC |  |  |  |  |  |  |  |  |  |
Summary Of Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  |  | 86.50% |  |

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