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Long-term debt - Narrative (Details)					1 Months Ended	12 Months Ended
Long-term debt - Narrative (Details)	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