GUARANTEES (Details) $ in Millions	Dec. 31, 2020 USD ($)
Guarantor Obligations [Line Items]
Maximum exposure	$ 140.0
Commercial Paper \| Evergy Missouri West
Guarantor Obligations [Line Items]
Maximum exposure	65.0
Guarantee \| Evergy Kansas Central
Guarantor Obligations [Line Items]
Maximum exposure	48.0
Guarantee \| Evergy Metro
Guarantor Obligations [Line Items]
Maximum exposure	48.0
Guarantee of Indebtedness of Others \| Evergy Missouri West
Guarantor Obligations [Line Items]
Maximum exposure	$ 92.0

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant