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Credit agreements and changes in debt - Note Purchase Agreements (Details) - Senior Notes - USD ($) | Oct. 29, 2020 | May 14, 2020
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Unsecured Senior Notes Series 2020A |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 80,000,000
Unsecured Senior Notes Series 2020A | Hawaiian Electric (parent only) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 50,000,000
Fixed coupon interest rate |  | 3.31%
Unsecured Senior Notes Series 2020A | HELCO |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 10,000,000
Fixed coupon interest rate |  | 3.96%
Unsecured Senior Notes Series 2020A | Maui Electric |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Fixed coupon interest rate |  | 3.31%
Unsecured Senior Notes Series 2020B |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 60,000,000
Unsecured Senior Notes Series 2020B | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 15,000,000 |
Unsecured Senior Notes Series 2020B | Hawaiian Electric (parent only) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 40,000,000
Fixed coupon interest rate |  | 3.31%
Unsecured Senior Notes Series 2020B | HELCO | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 15,000,000 |
Fixed coupon interest rate | 3.28% |
Maturity date (from funding) | 20 years |
Unsecured Senior Notes Series 2020B | Maui Electric |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Fixed coupon interest rate |  | 3.96%
Unsecured Senior Notes Series 2020C |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Unsecured Senior Notes Series 2020C | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 40,000,000 |
Unsecured Senior Notes Series 2020C | Hawaiian Electric (parent only) |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount |  | $ 20,000,000
Fixed coupon interest rate |  | 3.96%
Unsecured Senior Notes Series 2020C | HELCO | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 15,000,000 |
Fixed coupon interest rate | 3.51% |
Maturity date (from funding) | 30 years |
Unsecured Senior Notes Series 2020C | Maui Electric | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 25,000,000 |
Fixed coupon interest rate | 3.51% |
Maturity date (from funding) | 30 years |
Unsecured Senior Notes Series 2020D | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 30,000,000 |
Unsecured Senior Notes Series 2020D | Hawaiian Electric (parent only) | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 30,000,000 |
Fixed coupon interest rate | 3.28% |
Maturity date (from funding) | 20 years |
Unsecured Senior Notes Series 2020E | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 30,000,000 |
Unsecured Senior Notes Series 2020E | Hawaiian Electric (parent only) | Subsequent Event |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 30,000,000 |
Fixed coupon interest rate | 3.51% |
Maturity date (from funding) | 30 years |

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