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SHAREHOLDERS' EQUITY (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Jul. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 60,000,000
Stock repurchased and retired during period under repurchase plan, value | $ 578,300,000 | $ 1,600,000,000 |  |  |  |
Stock repurchased and retired during period (in shares) | 10,500,000 | 26,900,000 |  |  |  |
Stock repurchase program, authorized amount (in shares) | $ 450,000,000 | $ 450,000,000 |  |  | $ 475,000,000.0 |
Partial settlement of accelerated share repurchase agreement (in shares) | 6,300,000 | 6,300,000 | 1,900,000 | 6,400,000 |  |
Accelerated share repurchases, payment | $ 450,000,000 | $ 450,000,000 |  | $ 475,000,000 |  |
Restriction on payment of dividends, minimum ratio of total capitalization | 35.00% | 35.00% |  |  |  |
Restricted net assets of subsidiaries | $ 5,400,000,000 | $ 5,400,000,000 |  |  |  |
Cash Borrowings |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, debt to capitalization ratio (no more than) | 65.00% | 65.00% |  |  |  |
Westar Energy |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Restriction on payment of dividends, minimum ratio of total capitalization | 40.00% | 40.00% |  |  |  |
Westar Energy | Cash Borrowings |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, debt to capitalization ratio (no more than) | 65.00% | 65.00% |  |  |  |
KCP&L |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Restriction on payment of dividends, minimum ratio of total capitalization | 40.00% | 40.00% |  |  |  |
Retained earnings restrictions | $ 471,200,000 | $ 471,200,000 |  |  |  |
KCP&L | Cash Borrowings |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, debt to capitalization ratio (no more than) | 65.00% | 65.00% |  |  |  |
GMO | Cash Borrowings |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt Instrument, debt to capitalization ratio (no more than) | 65.00% | 65.00% |  |  |  |

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