XML 48 R37.htm IDEA: XBRL DOCUMENT
v3.22.2

Regulatory Matters: Tax Cut and Jobs Act (Details) - Kansas Corporation Commission (KCC) - Kansas Gas - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2022 | Jun. 30, 2022 | Jun. 30, 2022
Public Utilities, General Disclosures [Line Items] |  |  |
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually | $ 3.0 |  |
Number of Years TCJA and State Tax Reform Benefits to be Provide to Customers | 3 years |  |
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers | $ 9.1 |  |
Annual TCJA-Related Customer Billing Credits |  | $ 0.7 | $ 1.5

X
- Definition Annual TCJA-Related Customer Billing Credits + References No definition available. + Details
Name: | bkh_AnnualTCJARelatedCustomerBillingCredits
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of Years TCJA and State Tax Reform Benefits to be Provided to Customers + References No definition available. + Details
Name: | bkh_NumberOfYearsTCJAAndStateTaxReformBenefitsToBeProvideToCustomers
Namespace Prefix: | bkh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually + References No definition available. + Details
Name: | bkh_SettlementOfPlanToProvideTCJAAndStateTaxReformBenefitsToCustomersAnnually
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers + References No definition available. + Details
Name: | bkh_SettlementTotalOfPlanToProvideTCJAAndStateTaxReformBenefitsToCustomers
Namespace Prefix: | bkh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=bkh_KansasCorporationCommissionKCCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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