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Bank segment - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Allowance for credit losses |  |  |
Other bank borrowings | $ 593,000,000 |  | $ 750,000,000
American Savings Bank (ASB) |  |  |
Allowance for credit losses |  |  |
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required | 80.00% |  |
Unused line and letters of credits | $ 1,900,000,000 |  |
Advances from the FHLB | 593,000,000 |  | 200,000,000
American Savings Bank (ASB) | Federal Reserve Bank Advances |  |  |
Allowance for credit losses |  |  |
Other bank borrowings | 0 |  | $ 550,000,000
Home equity line of credit |  |  |
Allowance for credit losses |  |  |
Conversion of debt | 6,500,000 | $ 7,800,000 |
Commercial |  |  |
Allowance for credit losses |  |  |
Conversion of debt | 800,000 | 1,200,000 |
Consumer |  |  |
Allowance for credit losses |  |  |
Conversion of debt | $ 200,000 | $ 1,100,000 |

X
- Definition Financing Receivable, Conversion Of Debt + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item represents other bank borrowings as of the balance sheet date, including securities sold under agreements to repurchase and advances from the Federal Home Loan Bank. + References No definition available. + Details
Name: | he_OtherBankBorrowings
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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