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Bank segment (HEI only) - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 1988
Hawaiian Electric (parent only) |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Cash dividends paid | $ 172.0 | $ 145.0 | $ 157.0 |
Hawaiian Electric (parent only) | Consolidated subsidiary | American Savings Bank (ASB) | Management and administrative services |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Revenue from related party | 2.1 | 2.3 | $ 2.3 |
Hawaiian Electric (parent only) | Maximum |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Obligation to contribute additional capital under the Capital Maintenance Agreement |  |  |  | $ 65.1
Reduction in obligation to contribute additional capital under the Capital Maintenance Agreement | 28.3 |  |  |
American Savings Bank (ASB) |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Cash dividends paid | $ 59.0 | $ 31.0 |  |

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