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Long-term debt - Narrative (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2022 USD ($) | Oct. 26, 2022 USD ($) | Jul. 01, 2022 USD ($) MW | Sep. 29, 2021 USD ($) tranche | Nov. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 29, 2022 USD ($) | Jul. 31, 2022 MW
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | $ 172,000,000 |  |  |  |
2024 |  |  |  |  |  | 13,000,000 |  |  |  |
2025 |  |  |  |  |  | 109,000,000 |  |  |  |
2026 |  |  |  |  |  | 136,000,000 |  |  |  |
2027 |  |  |  |  |  | 112,000,000 |  |  |  |
Refinancing portion of debt | $ 150,000,000 |  |  |  | $ 150,000,000 |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | 227,312,000 | $ 285,886,000 | $ 415,997,000 |  |
Equity capitalization ratio |  |  |  | 58.00% |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from private placement |  |  |  | $ 125,000,000 |  |  |  |  |  |
Number of tranches | tranche |  |  |  | 2 |  |  |  |  |  |
Senior notes | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 75,000,000 |  |  |  |  |  |
Senior notes | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from debt on delayed basis |  | $ 50,000,000 |  |  |  |  |  |  |  |
HEI Facility | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 110,000,000 |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  | 100,000,000 |  |  |  |
2024 |  |  |  |  |  | 0 |  |  |  |
2025 |  |  |  |  |  | 47,000,000 |  |  |  |
2026 |  |  |  |  |  | 125,000,000 |  |  |  |
2027 |  |  |  |  |  | 100,000,000 |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  | 60,000,000 | 115,000,000 | $ 255,000,000 |  |
Long-term debt |  |  |  |  |  | 1,692,000,000 | 1,684,000,000 |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 1,150,000,000 | $ 1,142,000,000 |  |  |
Mahipapa, LLC | Green Energy Team, LLC |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unit of renewable energy (in mega watts) | MW |  |  | 7.5 |  |  |  |  |  |  | 7.5
Long-term debt |  |  | $ 61,000,000 |  |  |  |  |  |  |
Periodic principal and interest payments |  |  | $ 1,600,000 |  |  |  |  |  |  |

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