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Electric utility segment - Most Recent Proceedings (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 22, 2020 | Jul. 28, 2020 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Bill credits |  |  |  | $ 2,000,000 |
Regulatory assets |  |  | $ 565,543,000 | $ 565,543,000 | $ 766,708,000
International Brotherhood Of Electrical Workers, AFL-CIO, Local 1260 |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Collective bargaining agreement, general wage increase percentage |  |  |  | 3.00% |
Collective bargaining agreement, general wage increase, contract term |  |  |  | 3 years |
International Brotherhood Of Electrical Workers, AFL-CIO, Local 1260 | Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Unionized Employees Concentration Risk |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Operating revenues percentage |  |  |  | 47.00% |
Hawaiian Electric |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Common equity capitalization rate | 58.00% |  |  |  |
Stipulated ROACE rate | 9.50% |  |  |  |
Effective interest rate of return | 7.37% |  |  |  |
Hawaii Electric Light |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Common equity capitalization rate |  | 58.00% |  |  |
Stipulated ROACE rate |  | 9.50% |  |  |
Effective interest rate of return |  | 7.52% |  |  |
Amortization period for state investment tax credit |  | 10 years |  |  |
Risk sharing percentage, ratepayer |  | 98.00% |  |  |
Risk sharing percentage, rate increase |  | 2.00% |  |  |
Maximum exposure cap |  | $ 600,000 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Regulatory assets |  |  | 565,543,000 | $ 565,543,000 | $ 766,708,000
Hawaiian Electric Company, Inc. and Subsidiaries | COVID-19 |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |
Bill credits |  |  | 2,000,000 |  |
Regulatory assets |  |  | $ 27,800,000 | $ 27,800,000 |

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