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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
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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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