PENSION PLANS AND POST-RETIREMENT BENEFITS - Target Asset Allocations (Details)	Dec. 31, 2023
Evergy Kansas Central | Pension Benefits | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	26.00%
Evergy Kansas Central | Pension Benefits | International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	20.00%
Evergy Kansas Central | Pension Benefits | Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	39.00%
Evergy Kansas Central | Pension Benefits | Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central | Pension Benefits | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	4.00%
Evergy Kansas Central | Pension Benefits | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	11.00%
Evergy Kansas Central | Post-Retirement Benefits | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	26.00%
Evergy Kansas Central | Post-Retirement Benefits | International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	18.00%
Evergy Kansas Central | Post-Retirement Benefits | Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	56.00%
Evergy Kansas Central | Post-Retirement Benefits | Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central | Post-Retirement Benefits | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central | Post-Retirement Benefits | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro | Pension Benefits | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	26.00%
Evergy Metro | Pension Benefits | International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	19.00%
Evergy Metro | Pension Benefits | Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	38.00%
Evergy Metro | Pension Benefits | Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro | Pension Benefits | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	6.00%
Evergy Metro | Pension Benefits | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	11.00%
Evergy Metro | Post-Retirement Benefits | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	18.00%
Evergy Metro | Post-Retirement Benefits | International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	10.00%
Evergy Metro | Post-Retirement Benefits | Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	66.00%
Evergy Metro | Post-Retirement Benefits | Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	5.00%
Evergy Metro | Post-Retirement Benefits | Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro | Post-Retirement Benefits | Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	1.00%