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v3.19.1

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: |