XML 141 R109.htm IDEA: XBRL DOCUMENT v3.20.4

LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2020	May 31, 2020	Apr. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ (436.4)			$ (251.1)
Unamortized debt discount and debt issuance costs	(84.9)			(80.7)
Total excluding current maturities	9,190.9			8,746.7
Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	110.4			125.5
Long-term Debt, Current Maturities	$ (4.4)			$ (4.3)
Mortgage Bonds | Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate				5.10%
Long-term debt gross				$ 250.0
Mortgage Bonds | Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Interest rate	3.25%			3.25%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds | Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Interest rate	2.55%			2.55%
Long-term debt gross	$ 350.0			$ 350.0
Mortgage Bonds | Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Interest rate	3.10%			3.10%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds | Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Interest rate	4.125%			4.125%
Long-term debt gross	$ 550.0			$ 550.0
Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.10%			4.10%
Long-term debt gross	$ 430.0			$ 430.0
Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.625%			4.625%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds | Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Interest rate	4.25%			4.25%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds | Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Interest rate	3.25%			3.25%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds | Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate	3.45%
Long-term debt gross	$ 500.0
Mortgage Bonds | Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Interest rate	6.15%			6.15%
Long-term debt gross	$ 50.0			$ 50.0
Mortgage Bonds | Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Interest rate	6.53%			6.53%
Long-term debt gross	$ 175.0			$ 175.0
Mortgage Bonds | Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Interest rate	6.64%			6.64%
Long-term debt gross	$ 100.0			$ 100.0
Mortgage Bonds | Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Interest rate	4.30%			4.30%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds | Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Interest rate	2.95%			2.95%
Long-term debt gross	$ 79.5			$ 79.5
Mortgage Bonds | Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate	2.25%
Long-term debt gross	$ 400.0
Mortgage Bonds | Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate	4.125%			4.125%
Long-term debt gross	$ 400.0			$ 400.0
Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Interest rate	9.44%			9.44%
Long-term debt gross	$ 1.1			$ 2.3
Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 45.0			$ 45.0
Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 30.5			$ 30.5
Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 21.9			$ 21.9
Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Interest rate	2.50%			2.50%
Long-term debt gross	$ 50.0			$ 50.0
Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 14.5			$ 14.5
Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Interest rate	1.39%			1.39%
Long-term debt gross	$ 10.0			$ 10.0
Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Interest rate	1.432%			1.432%
Long-term debt gross	$ 146.5			$ 146.5
Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Interest rate	2.75%			2.75%
Long-term debt gross	$ 23.4			$ 23.4
Senior Notes | Series Notes Due 2023 EM
Debt Instrument [Line Items]
Interest rate	3.15%			3.15%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes | Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Interest rate	3.65%			3.65%
Long-term debt gross	$ 350.0			$ 350.0
Senior Notes | Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Interest rate	6.05%			6.05%
Long-term debt gross	$ 250.0			$ 250.0
Senior Notes | Senior Notes Due 2035A EM
Debt Instrument [Line Items]
Interest rate	5.78%			5.78%
Senior Notes | Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Interest rate	5.30%			5.30%
Long-term debt gross	$ 400.0			$ 400.0
Senior Notes | Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Interest rate	4.20%			4.20%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes | Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Interest rate	4.20%			4.20%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes | Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Interest rate	8.27%			8.27%
Long-term debt gross	$ 80.9			$ 80.9
Senior Notes | Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Interest rate	3.49%			3.49%
Long-term debt gross	$ 36.0			$ 36.0
Senior Notes | Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Interest rate	4.06%			4.06%
Long-term debt gross	$ 60.0			$ 60.0
Senior Notes | Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Interest rate	4.74%			4.74%
Long-term debt gross	$ 150.0			$ 150.0
Senior Notes | Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Interest rate	3.74%			3.74%
Long-term debt gross	$ 100.0			$ 100.0
Senior Notes | Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate	4.85%			4.85%
Long-term debt gross	$ 350.0			$ 350.0
Senior Notes | Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate	5.292%			5.292%
Long-term debt gross	$ 287.5			$ 287.5
Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Interest rate	2.45%			2.45%
Long-term debt gross	$ 800.0			$ 800.0
Senior Notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate	2.90%			2.90%
Long-term debt gross	$ 800.0			$ 800.0
Senior Notes | Senior Notes Due 2029A
Debt Instrument [Line Items]
Interest rate	3.77%			3.77%
Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.33%			7.33%
Long-term debt gross	$ 3.0			$ 3.0
Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.17%			7.17%
Long-term debt gross	$ 7.0			$ 7.0
Evergy Kansas Central
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0.0			(250.0)
Unamortized debt discount and debt issuance costs	(45.4)			(40.8)
Total excluding current maturities	3,931.5			3,436.1
Evergy Kansas Central | Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate			5.10%
Long-term debt gross			$ 250.0	250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	350.0			350.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	550.0			550.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	430.0			430.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate			3.45%
Long-term debt gross	500.0		$ 500.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0			50.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	175.0			175.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	100.0			100.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	45.0			45.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	30.5			30.5
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	21.9			21.9
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0			50.0
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	14.5			14.5
Evergy Kansas Central | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	10.0			10.0
Evergy Kansas Central | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Senior Notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central | Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0.0			0.0
Unamortized debt discount and debt issuance costs	(26.4)			(24.4)
Total excluding current maturities	2,923.0			2,525.0
Evergy Metro | Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Long-term debt gross				0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	79.5			79.5
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate		2.25%
Long-term debt gross	400.0	$ 400.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross	400.0			400.0
Evergy Metro | Mortgage Bonds | Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Mortgage Bonds | General Mortgage Bonds EIRR Series 2005
Debt Instrument [Line Items]
Long-term debt gross	50.0			21.9
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	146.5			146.5
Evergy Metro | Pollution Control Bonds | EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	23.4			23.4
Evergy Metro | Senior Notes | Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro | Senior Notes | Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	350.0			350.0
Evergy Metro | Senior Notes | Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Metro | Senior Notes | Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	400.0			400.0
Evergy Metro | Senior Notes | Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro | Senior Notes | Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro | Senior Notes | Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Senior Notes | Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro | Medium Term Notes | Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Variable Interest Entities
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	0.0			18.8
Variable Interest Entities | Unsecured Debt | Unsecured Debt Due 2021 VIEs
Debt Instrument [Line Items]
Long-term debt gross	18.8			51.1
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	0.0			18.8
Variable Interest Entities | Evergy Kansas Central
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	$ 0.0			$ 18.8

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_LongTermDebtFairValueAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2020EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2025EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2026EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2027EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2042EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2043AEKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2043BEKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2045EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2049KEKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2050EKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2023EKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2037EKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2038KEKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2044EKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2023EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2030EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MortgageBondsDue2049EvergyMetroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_FirstMortgageBondsDueThrough2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=evrg_PollutionControlBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2032AEKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2032BEKCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2027EKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2031EKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2032AEKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_PollutionControlBondsDue2032BEKSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_EIRRBondsSeries2007Aand2007Bdue2035EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_EERRBonds2875PercentSeries2008EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesdue2023EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesdue2025EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_Seniornotesdue2035EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesDue2035And5.78EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesDue2041EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesDue2047EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesDue2048EMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotes827PercentSeriesDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesSeriesAdue2025EMWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesSeriesBdue2033EMWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesSeriesCdue2043EMWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesSeriesDue2022EMWMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotesDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotes5.292PercentSeriesDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotes2.45PercentSeriesDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotes2.90PercentSeriesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_SeniorNotes3.77PercentSeriesDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MediumTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MediumTermNotes733PercentSeriesDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_MediumTermNotes717PercentSeriesDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=evrg_EvergyKansasCentralIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=evrg_EvergyMetroIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_GeneralMortgagebondsEIRRseries2005Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=evrg_UnsecuredDebtDue2021VIEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: