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TAXES - Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount $ 284.1  
Operating loss carryforwards of federal income tax benefit 7.1  
Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 237.9  
Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 43.6  
General Business Tax Credit Carryforward    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 284.1 $ 311.0
Amount of tax credit acquired in business combination 0.1  
General Business Tax Credit Carryforward | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 237.9 226.9
General Business Tax Credit Carryforward | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 43.6 $ 77.6
State and Local Jurisdiction    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 4.8  
Operating loss carryforwards of federal income tax benefit 2.7  
State and Local Jurisdiction | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 4.8  
Operating loss carryforwards of federal income tax benefit 2.7  
Tax Year 2007 [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.1  
Tax Year 2007 [Member] | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
Tax Year 2007 [Member] | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 0.0  
Tax Year 2016 [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 8.5  
Tax Year 2016 [Member] | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 3.2  
Tax Year 2016 [Member] | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 4.6  
Tax Year 2017 [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 44.0  
Tax Year 2017 [Member] | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 34.9  
Tax Year 2017 [Member] | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 8.4  
2018    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 43.9  
2018 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 36.3  
2018 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 7.5  
2019    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 37.7  
2019 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 30.9  
2019 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 6.7  
2020    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 35.9  
2020 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 28.4  
2020 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 7.4  
Tax Year 2021    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 31.9  
Tax Year 2021 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 28.1  
Tax Year 2021 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 3.7  
Tax Year 2022 [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 34.8  
Tax Year 2022 [Member] | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 31.7  
Tax Year 2022 [Member] | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 2.6  
Tax Year 2023    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 47.3  
Tax Year 2023 | Evergy Kansas Central    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount 44.4  
Tax Year 2023 | Evergy Metro    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward, amount $ 2.7