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Regulatory Matters: Tax Cut and Jobs Act (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2022 | Dec. 21, 2017 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 21, 2017 | Jan. 26, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
U.S. federal corporate tax rate |  | 35.00% | 21.00% | 21.00% | 21.00% | 35.00% |
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Settlement of plan to provide TCJA-related customer billing credits to its customers |  |  |  |  | $ 9.3 |  |
Nebraska Public Service Commission (NPSC) | Black Hills Energy - Nebraska Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Settlement of plan to provide TCJA-related customer billing credits to its customers |  |  |  |  |  |  | $ 2.9
Kansas Corporation Commission (KCC) | Black Hills Energy, Kansas Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Annual TCJA-Related Customer Billing Credits |  |  | $ 2.9 |  |  |  |
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually | $ 3.0 |  |  |  |  |  |
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers | $ 9.1 |  |  |  |  |  |
Number of Years TCJA and State Tax Reform Benefits to be Provide to Customers | 3 years |  |  |  |  |  |
Annual TCJA-Related Customer Billing Credits |  |  | $ 2.9 |  |  |  |

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