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Credit agreement (Details) - HECO | Mar. 31, 2014
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Credit agreement |
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) | 56.00%
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) | 45.00%

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- 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
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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
Balance Type: | na
Period Type: | instant

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
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration