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LEASES Narrative (Details)	3 Months Ended
	Mar. 31, 2019
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum | Westar Energy
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum | KCP&L
Lessee, Lease, Description [Line Items]
Remaining lease term	2 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	20 years
Maximum | Westar Energy
Lessee, Lease, Description [Line Items]
Remaining lease term	20 years
Maximum | KCP&L
Lessee, Lease, Description [Line Items]
Remaining lease term	27 years

X

- Definition

Lease, Remaining Lease Term

+ References

No definition available.

+ Details

Name:	evrg_LeaseRemainingLeaseTerm
Namespace Prefix:	evrg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=evrg_WestarEnergyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=evrg_KCPLMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: