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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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