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TAXES - Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | $ 379.6 |
Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 176.5 |
Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 195.9 |
General Business Tax Credit Carryforward |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 379.6 | $ 379.0
Amount of tax credit acquired in business combination | 0.2 |
Valuation allowance | 0.2 |
General Business Tax Credit Carryforward | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 176.5 | 168.8
General Business Tax Credit Carryforward | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 195.9 | 203.2
State and Local Jurisdiction |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount |  | 169.9
State and Local Jurisdiction | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount |  | 168.5
State and Local Jurisdiction | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount |  | 1.2
Federal Alternative Minimum Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount |  | 37.9
Federal Alternative Minimum Tax Credit Carryforward [Member] | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount |  | $ 13.4
2003 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.1 |
2003 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2003 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2004 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.1 |
2004 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2004 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2005 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.1 |
2005 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2005 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2006 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.1 |
2006 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2006 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2007 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.1 |
2007 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2007 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2008 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 27.4 |
2008 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.5 |
2008 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 26.6 |
2009 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 47.7 |
2009 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.2 |
2009 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 47.3 |
2010 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 18.3 |
2010 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2010 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 18.2 |
2011 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 13.3 |
2011 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 0.0 |
2011 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 13.2 |
2012 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 12.8 |
2012 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 2.0 |
2012 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 10.7 |
2013 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 24.3 |
2013 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 11.3 |
2013 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 12.9 |
2014 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 24.1 |
2014 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 10.7 |
2014 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 13.0 |
2015 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 24.7 |
2015 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 10.9 |
2015 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 13.2 |
2016 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 27.1 |
2016 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 11.0 |
2016 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 12.4 |
2017 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 43.9 |
2017 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 35.1 |
2017 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 8.2 |
2018 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 43.9 |
2018 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 36.3 |
2018 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 7.5 |
2019 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 37.7 |
2019 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 30.9 |
2019 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 6.7 |
2020 |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 33.9 |
2020 | Evergy Kansas Central |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | 27.6 |
2020 | Evergy Metro |  |
Tax Credit Carryforward [Line Items] |  |
Tax credit carryforward, amount | $ 6.0 |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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