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Credit agreement and changes in debt - Narrative (Details) | May 14, 2023 USD ($) extensionOption institution | Feb. 18, 2022 USD ($) extensionOption | Dec. 08, 2023 USD ($) | Aug. 23, 2023 USD ($) | Aug. 15, 2023 USD ($) | May 14, 2021 USD ($) institution
--- | --- | --- | --- | --- | --- | ---
Credit Facilities | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |
Credit agreement |  |  |  |  |  |
Number of financial institutions | institution | 9 |  |  |  |  | 9
Number of financial institutions with extended termination date | institution | 8 |  |  |  |  |
HEI Facility |  |  |  |  |  |
Credit agreement |  |  |  |  |  |
Credit agreement | $ 175,000,000 |  |  | $ 175,000,000 | $ 175,000,000 | $ 175,000,000
Credit agreement, remaining borrowing capacity | 157,000,000 |  |  |  |  |
Amount of initial drawing |  |  |  |  | $ 2,500,000 |
Hawaiian Electric Facility |  |  |  |  |  |
Credit agreement |  |  |  |  |  |
Credit agreement | 200,000,000 |  |  |  |  |
Credit agreement, remaining borrowing capacity | $ 180,000,000 |  |  |  |  |
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |
Credit agreement |  |  |  |  |  |
Credit agreement |  | $ 275,000,000 |  | $ 200,000,000 |  | $ 200,000,000
Number of extension options | extensionOption | 2 | 2 |  |  |  |
Extension period | 1 year | 1 year |  |  |  |
Hawaiian Electric Facility | Hawaiian Electric Company, Inc. and Subsidiaries | Letter of Credit |  |  |  |  |  |
Credit agreement |  |  |  |  |  |
Credit agreement |  |  | $ 75,000,000 |  |  |

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