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Credit agreements (Details) |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 02, 2014 USD ($) Institution | Jan. 31, 2015 | Mar. 31, 2017 | Apr. 01, 2014 USD ($)
Credit agreement |  |  |  |
Number of financial institutions (in institutions) | Institution | 9 |  |  |
Actual capitalization ratio (as a percent) |  |  | 13.00% |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 65.00% |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 35.00% |  |  |
Actual ratio of consolidated debt to total consolidated capitalization (as a percent) |  |  | 57.00% |
Hawaiian Electric Company |  |  |  |
Credit agreement |  |  |  |
Number of financial institutions (in institutions) | Institution | 9 |  |  |
HELCO |  |  |  |
Credit agreement |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  | 42.00% |
Maui Electric |  |  |  |
Credit agreement |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  | 42.00% |
Maximum |  |  |  |
Credit agreement |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) | 50.00% |  |  |
Line of credit facility |  |  |  |
Credit agreement |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility | $ | $ 150,000,000 |  |  | $ 125,000,000
Unused capacity commitment fee (as a percent) | 0.20% |  |  |
Line of credit facility | Hawaiian Electric Company |  |  |  |
Credit agreement |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility | $ | $ 200,000,000 |  |  | $ 175,000,000
Unused capacity commitment fee (as a percent) |  | 0.20% |  |
Line of credit facility | Adjusted LIBOR Rate |  |  |  |
Credit agreement |  |  |  |
Basis spread on variable rate (as a percent) | 1.375% |  |  |
Line of credit facility | Adjusted LIBOR Rate | Hawaiian Electric Company |  |  |  |
Credit agreement |  |  |  |
Basis spread on variable rate (as a percent) |  | 1.375% |  |

X
- Definition Represents the consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The actual consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatioActual
Namespace Prefix: | he_
Data Type: | num:percentItemType
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X
- Definition Represents the consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The actual consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatioActual
Namespace Prefix: | he_
Data Type: | num:percentItemType
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X
- Definition Represents the nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantNonconsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the actual nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition 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. + References No definition available. + Details
Name: | he_NumberOfFinancialInstitutions
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Data Type: | num:percentItemType
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- 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 No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Details
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- Details
Name: | dei_LegalEntityAxis=he_HawaiiElectricLightCompanyIncMember
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- Details
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- Details
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- Details
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- Details
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