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Credit agreement and changes in debt - Narrative (Details) | Nov. 01, 2023 USD ($) | May 14, 2023 USD ($) institution extensionOption | Feb. 18, 2022 USD ($) extensionOption | Aug. 23, 2023 USD ($) | Aug. 15, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 16, 2023 USD ($) | Dec. 28, 2022 USD ($) | Oct. 20, 2022 USD ($) | May 14, 2021 USD ($) institution
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
HEI Facility |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Credit agreement |  | $ 175,000,000 |  | $ 175,000,000 | $ 175,000,000 |  |  |  |  | $ 175,000,000
Credit agreement, remaining borrowing capacity |  | 157,000,000 |  |  |  |  |  |  |  |
Amount of initial drawing |  |  |  |  | $ 2,500,000 |  |  |  |  |
HEI Facility | Senior Notes |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 100,000,000 |  |  |
Hawaiian Electric Facility |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Credit agreement |  | 200,000,000 |  | $ 200,000,000 |  |  |  |  |  |
Credit agreement, remaining borrowing capacity |  | $ 180,000,000 |  |  |  |  |  |  |  |
Hawaiian Electric Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Repayment of credit | $ 100,000,000 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Credit Facilities |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Number of financial institutions | institution |  | 9 |  |  |  |  |  |  |  | 9
Number of financial institutions with extended termination date | institution |  | 8 |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Hawaiian Electric Facility |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  | $ 200,000,000 |  |  |  |  |  |  | $ 200,000,000
Number of extension options | extensionOption |  | 2 | 2 |  |  |  |  |  |  |
Extension period |  | 1 year | 1 year |  |  |  |  |  |  |
Extended maximum borrowing capacity |  |  | $ 275,000,000 |  |  |  |  |  |  |
Hawaiian Electric, Parent | Term Loan |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 100,000,000 |
Line of credit outstanding |  |  |  |  |  | $ 65,000,000 |  | $ 35,000,000 |  |
Hawaiian Electric, Parent | Term Loan | SOFR |  |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 5.81% |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482900/835-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-2 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482949/835-30-55-8 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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