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VARIABLE INTEREST ENTITIES - Narrative (Details)	1 Months Ended		3 Months Ended	12 Months Ended
	Aug. 31, 2019	Jul. 31, 2017	Mar. 31, 2019	Dec. 31, 2020
Jeffrey Energy Center
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%	8.00%	8.00%	8.00%
La Cygne Unit 2 [Member]
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%
Evergy Kansas Central | Jeffrey Energy Center
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%
Evergy Kansas Central | La Cygne Unit 2 [Member]
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

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- Details

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