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Regulatory Matters: Rate Review (Details) - Rate Review Filed with the Regulatory Agency $ in Millions	Jun. 01, 2022 USD ($) mi	Dec. 10, 2021 USD ($) mi
Arkansas Public Service Commission | Black Hills Energy, Arkansas
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments		7,200
Public Utilities, Requested Rate Increase (Decrease), Amount | $		$ 22
Public Utilities, Requested Equity Capital Structure, Percentage		50.90%
Public Utilities, Requested Debt Capital Structure, Percentage		49.10%
Public Utilities, Requested Return on Equity, Percentage		10.20%
Wyoming Public Service Commission | Wyoming Electric
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount | $	$ 15
Public Utilities, Requested Equity Capital Structure, Percentage	54.00%
Public Utilities, Requested Debt Capital Structure, Percentage	46.00%
Public Utilities, Requested Return on Equity, Percentage	10.30%
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments	1,330
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments	59

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