XML 89 R69.htm IDEA: XBRL DOCUMENT
v3.19.1

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Less: current portion | $ 16,100,000 |  |
Total long-term obligations under operating leases | 86,900,000 |  |
Westar Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Less: current portion | 10,500,000 |  |
Total long-term obligations under operating leases | 24,300,000 |  |
Westar Energy | GMO |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 2,500,000 |  | $ 2,600,000
Westar Energy | KCP&L |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | (8,300,000) |  | (13,500,000)
Westar Energy | KCP&L | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | 7,400,000 |  |
Westar Energy | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | (500,000) |  | (1,400,000)
Westar Energy | Evergy | Income Tax Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 32,000,000 |  | 42,700,000
KCP&L |  |  |
Related Party Transaction [Line Items] |  |  |
Less: current portion | 6,300,000 |  |
Total long-term obligations under operating leases | 93,000,000 |  |
KCP&L | Money Pool |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 0 |  | 0
KCP&L | GMO |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 53,600,000 |  | 72,600,000
KCP&L | Westar Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 8,300,000 |  | 13,500,000
KCP&L | Evergy |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | 19,300,000 |  | 15,700,000
KCP&L | Evergy | Income Taxes Payable |  |  |
Related Party Transaction [Line Items] |  |  |
Due from (to) related parties | $ (10,600,000) |  | $ (2,000,000)
Iatan No 1 And 2 | GMO |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 18.00% |  |
Iatan No 1 And 2 | KCP&L | GMO | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | $ 42,000,000 | $ 46,400,000 |
Jeffrey Energy Center | GMO |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 8.00% |  |
Jeffrey Energy Center | Westar Energy | GMO | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | $ 6,300,000 |  |
La Cygne Station | Westar Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Jointly owned utility plant, proportionate ownership share | 50.00% |  |
La Cygne Station | KCP&L | Westar Energy | Operating Expenses and Capital Costs Billed |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction | $ 31,500,000 |  |
Westar Energy | KCP&L | Subsidiary of Common Parent |  |  |
Related Party Transaction [Line Items] |  |  |
Operating lease, right-of-use asset | 30,000,000 |  |
Less: current portion | 600,000 |  |
Total long-term obligations under operating leases | $ 29,400,000 |  |

X
- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=115995737&loc=d3e659983-123033 + Details
Name: | us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=evrg_WestarEnergyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=evrg_KcplGreaterMissouriOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=evrg_KCPLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=evrg_OperatingExpensesAndCapitalCostsBilledMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=evrg_EvergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=evrg_IncomeTaxReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=evrg_KCPLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=evrg_MoneyPoolMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=evrg_WestarEnergyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=evrg_IncomeTaxesPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=evrg_JointlyOwnedElectricityGenerationPlantIatanNo1And2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=evrg_KcplGreaterMissouriOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=evrg_JeffreyEnergyCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=evrg_LaCygneStationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=evrg_WestarEnergyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_SubsidiaryOfCommonParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |