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Long-term debt - Note Purchase Agreements (Details) - Senior notes - USD ($)	Oct. 29, 2020	May 14, 2020
Unsecured Senior Notes Series 2020A
Debt Instrument [Line Items]
Aggregate principal amount		$ 80,000,000
Unsecured Senior Notes Series 2020A | Hawaiian Electric
Debt Instrument [Line Items]
Aggregate principal amount		$ 50,000,000
Fixed coupon interest rate		0.0331%
Unsecured Senior Notes Series 2020A | HELCO
Debt Instrument [Line Items]
Aggregate principal amount		$ 10,000,000
Fixed coupon interest rate		0.0396%
Unsecured Senior Notes Series 2020A | Maui Electric
Debt Instrument [Line Items]
Aggregate principal amount		$ 20,000,000
Fixed coupon interest rate		0.0331%
Unsecured Senior Notes Series 2020B
Debt Instrument [Line Items]
Aggregate principal amount	$ 15,000,000	$ 60,000,000
Unsecured Senior Notes Series 2020B | Hawaiian Electric
Debt Instrument [Line Items]
Aggregate principal amount		$ 40,000,000
Fixed coupon interest rate		0.0331%
Unsecured Senior Notes Series 2020B | HELCO
Debt Instrument [Line Items]
Aggregate principal amount	$ 15,000,000
Fixed coupon interest rate	3.28%
Unsecured Senior Notes Series 2020B | Maui Electric
Debt Instrument [Line Items]
Aggregate principal amount		$ 20,000,000
Fixed coupon interest rate		0.0396%
Unsecured Senior Notes Series 2020C
Debt Instrument [Line Items]
Aggregate principal amount	$ 40,000,000	$ 20,000,000
Unsecured Senior Notes Series 2020C | Hawaiian Electric
Debt Instrument [Line Items]
Aggregate principal amount		$ 20,000,000
Fixed coupon interest rate		0.0396%
Unsecured Senior Notes Series 2020C | HELCO
Debt Instrument [Line Items]
Aggregate principal amount	$ 15,000,000
Fixed coupon interest rate	3.51%
Unsecured Senior Notes Series 2020C | Maui Electric
Debt Instrument [Line Items]
Aggregate principal amount	$ 25,000,000
Fixed coupon interest rate	3.51%
Unsecured Senior Notes Series 2020D
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Unsecured Senior Notes Series 2020D | Hawaiian Electric
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Fixed coupon interest rate	3.28%
Unsecured Senior Notes Series 2020E
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Unsecured Senior Notes Series 2020E | Hawaiian Electric
Debt Instrument [Line Items]
Aggregate principal amount	$ 30,000,000
Fixed coupon interest rate	3.51%

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-Topic 835
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