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v3.22.4

Long-term debt - Note Purchase Agreements (Details) - Senior notes - USD ($) | Jan. 10, 2023 | Dec. 31, 2022 | May 11, 2022
--- | --- | --- | ---
Series 2022A |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  | $ 30,000,000 |
Fixed coupon interest rate |  | 2.98% |
Series 2022A | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  |  | $ 60,000,000
Fixed coupon interest rate |  |  | 3.70%
Series 2022A | Hawaiian Electric |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  |  | $ 40,000,000
Series 2022A | Hawaii Electric Light |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  |  | 10,000,000
Series 2022A | Maui Electric |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount |  |  | $ 10,000,000
Series 2023A | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 90,000,000 |  |
Series 2023A | Hawaiian Electric | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 40,000,000 |  |
Fixed coupon interest rate | 6.11% |  |
Series 2023A | Hawaii Electric Light | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 25,000,000 |  |
Fixed coupon interest rate | 6.25% |  |
Series 2023A | Maui Electric | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 25,000,000 |  |
Fixed coupon interest rate | 6.25% |  |
Series 2023B | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 40,000,000 |  |
Series 2023B | Hawaiian Electric | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 40,000,000 |  |
Fixed coupon interest rate | 6.25% |  |
Series 2023C | Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 20,000,000 |  |
Series 2023C | Hawaiian Electric | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount | $ 20,000,000 |  |
Fixed coupon interest rate | 6.70% |  |

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