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Debt Instrument, Covenant, Equity Capitalization Ratio

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Number Of Draw Down Tranches

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Represents the number of financial institutions with which the entity entered into a revolving Non Collateralized credit agreement with a letter of credit sub-facility.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments including both interest and principal payments.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Credit agreement and changes in debt - Narrative (Details)					1 Months Ended	9 Months Ended
	Oct. 26, 2022 USD ($)	Jul. 01, 2022 USD ($) MW	Feb. 18, 2022 USD ($) extensionOption	Sep. 29, 2021 USD ($) tranche	Nov. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Oct. 20, 2022 USD ($)	Sep. 29, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 14, 2021 USD ($) institution
Credit agreement
Proceeds from issuance of long-term debt						$ 67,312,000	$ 206,988,000
Public utilities, equity capitalization ratio				58.00%
Forecast
Credit agreement
Refinanced debt					$ 150,000,000
Senior Notes
Credit agreement
Proceeds from issuance of private placement				$ 125,000,000
Number of tranches \| tranche				2
Senior Notes \| Tranche One
Credit agreement
Proceeds from issuance of long-term debt				$ 75,000,000
Senior Notes \| Subsequent Event \| Tranche Two
Credit agreement
Proceeds from debt on delayed basis	$ 50,000,000
HEI Facility
Credit agreement
Credit agreement											$ 175,000,000
HEI Facility \| Senior Notes
Credit agreement
Aggregate principal amount									$ 110,000,000
Term Loan \| Subsequent Event
Credit agreement
Aggregate principal amount								$ 100,000,000
HEI Series 2022C \| Senior Notes
Credit agreement
Aggregate principal amount						75,000,000
Hawaiian Electric Company, Inc. and Subsidiaries
Credit agreement
Proceeds from issuance of long-term debt						60,000,000	$ 115,000,000
Hawaiian Electric Company, Inc. and Subsidiaries \| Credit Facilities
Credit agreement
Number of financial institutions \| institution											9
Credit agreement						$ 0				$ 0
Hawaiian Electric Company, Inc. and Subsidiaries \| Hawaiian Electric Facility
Credit agreement
Credit agreement			$ 275,000,000								$ 200,000,000
Number of extension options \| extensionOption			2
Extension period			1 year
Mahipapa \| Green Energy Team, LLC
Credit agreement
Unit of renewable energy (in mega watts) \| MW		7.5
Aggregate principal amount, issued		$ 61,000,000
Periodic principal and interest payments		$ 1,600,000