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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