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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Details) - ASU 2016-02 $ in Millions	Jan. 01, 2019 USD ($)
Summary Of Accounting Policies [Line Items]
Lease asset	$ 110
Lease liability	110
Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Lease asset	40
Lease liability	40
Evergy Metro
Summary Of Accounting Policies [Line Items]
Lease asset	80
Lease liability	$ 80

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- Definition

[Line Items] for Summary Of Accounting Policies [Table]

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