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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%

X

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