PENSION PLANS AND POST-RETIREMENT BENEFITS - Weighted-Average Assumptions (Details)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.35%	5.72%
Rate of compensation increase	3.72%	3.72%
Interest crediting rate for cash balance plans	4.13%	4.13%
Weighted-average assumptions used to determine net costs
Discount rate	5.45%	3.10%
Expected long-term return on plan assets	6.71%	6.71%
Rate of compensation increase	3.72%	3.75%
Interest crediting rate for cash balance plans	4.13%	4.13%
Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.43%	5.74%
Rate of compensation increase	3.75%	3.75%
Weighted-average assumptions used to determine net costs
Discount rate	5.74%	3.12%
Expected long-term return on plan assets	5.48%	4.53%
Rate of compensation increase	3.75%	3.75%
Evergy Kansas Central \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.34%	5.72%
Rate of compensation increase	3.77%	3.78%
Interest crediting rate for cash balance plans	4.20%	4.00%
Weighted-average assumptions used to determine net costs
Discount rate	5.66%	3.10%
Expected long-term return on plan assets	6.80%	6.80%
Rate of compensation increase	3.78%	3.77%
Interest crediting rate for cash balance plans	4.00%	4.00%
Evergy Kansas Central \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.45%	5.75%
Weighted-average assumptions used to determine net costs
Discount rate	5.75%	3.11%
Expected long-term return on plan assets	5.75%	5.75%
Evergy Metro \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.35%	5.72%
Rate of compensation increase	3.71%	3.70%
Interest crediting rate for cash balance plans	4.47%	4.43%
Weighted-average assumptions used to determine net costs
Discount rate	5.62%	3.11%
Expected long-term return on plan assets	6.62%	6.63%
Rate of compensation increase	3.70%	3.71%
Interest crediting rate for cash balance plans	4.43%	4.45%
Evergy Metro \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	5.41%	5.72%
Rate of compensation increase	3.75%	3.75%
Weighted-average assumptions used to determine net costs
Discount rate	5.72%	3.13%
Expected long-term return on plan assets	5.22%	3.25%
Rate of compensation increase	3.75%	3.75%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate.

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