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Electric utility segment - Related-Party Transactions (Details) - Hawaiian Electric (parent only) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Related Party Transaction [Line Items] |  |  |
Amount charged to subsidiaries for general management and administrative services | $ 5,200,000 | $ 5,600,000 | $ 6,000,000
Short-term borrowings due to related party | 0 | 0 |
Hawaii Electric Light | Hamakua Energy |  |  |
Related Party Transaction [Line Items] |  |  |
Amount charged to subsidiaries for general management and administrative services | $ 54,000,000 | $ 50,000,000 | $ 68,000,000

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