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SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT (Details)	1 Months Ended	3 Months Ended
	Mar. 31, 2019 USD ($) loan	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Short-term Debt [Line Items]
Available borrowings	$ 1,664,900,000	$ 1,664,900,000	$ 1,737,300,000
Cash Borrowings
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity	2,500,000,000.0	$ 2,500,000,000.0
Credit facility expiration date		Dec. 31, 2023
Debt instrument, debt default, threshold	$ 100,000,000.0	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Cash Borrowings | Maximum
Short-term Debt [Line Items]
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Evergy, Inc.
Short-term Debt [Line Items]
Available borrowings	$ 349,000,000	$ 349,000,000	449,000,000
Westar Energy
Short-term Debt [Line Items]
Available borrowings	567,900,000	567,900,000	570,000,000
Westar Energy | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Westar Energy | Cash Borrowings | Maximum
Short-term Debt [Line Items]
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
KCP&L
Short-term Debt [Line Items]
Available borrowings	$ 421,300,000	$ 421,300,000	420,400,000
KCP&L | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
KCP&L | Cash Borrowings | Maximum
Short-term Debt [Line Items]
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
GMO
Short-term Debt [Line Items]
Available borrowings	$ 326,700,000	$ 326,700,000	$ 297,900,000
GMO | Cash Borrowings
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
GMO | Cash Borrowings | Maximum
Short-term Debt [Line Items]
Debt Instrument, debt to capitalization ratio (no more than)	65.00%	65.00%
Term Loan | Line of Credit
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity	$ 1,000,000,000.0	$ 1,000,000,000.0
Debt instrument, term	6 months
Number of loans | loan	2
Proceeds from lines of credit		500,000,000
Available borrowings	$ 500,000,000	500,000,000
Long-term line of credit	$ 500,000,000	$ 500,000,000
Interest rate during period	3.03%	3.03%

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