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Maui windstorm and wildfires - Utilities Charged (Details) - Natural Disasters and Other Casualty Events - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Maui Windstorm and Wildfires
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	$ 30,118	$ 138,383
Insurance recovery	(12,577)	(104,580)
Deferral treatment approved by the PUC	(7,898)	(14,692)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	9,643	19,111
Legal expenses
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	15,027	34,876
Loss From Catastrophes, One 'Ohana Initiative Contribution
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	0	75,000
Other expense
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	15,091	28,507
Hawaiian Electric Company, Inc. and Subsidiaries | Maui Windstorm and Wildfires
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	24,567	114,808
Insurance recovery	(9,969)	(98,613)
Deferral treatment approved by the PUC	(7,898)	(14,692)
Total Maui windstorm and wildfires related expenses, net of insurance recoveries and approved deferral treatment	6,700	1,503
Hawaiian Electric Company, Inc. and Subsidiaries | Legal expenses
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	10,735	24,737
Hawaiian Electric Company, Inc. and Subsidiaries | Loss From Catastrophes, One 'Ohana Initiative Contribution
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	0	75,000
Hawaiian Electric Company, Inc. and Subsidiaries | Other expense
Public Utilities, General Disclosures [Line Items]
Total Maui windstorm and wildfires related expenses	$ 13,832	$ 15,071

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