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Short-term borrowings (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 02, 2014 Institution | Apr. 01, 2014
Short-term borrowings |  |  |  |
Outstanding amount | 118,972,000 us-gaap_OtherShortTermBorrowings | $ 105,482,000 us-gaap_OtherShortTermBorrowings |  |
HEI |  |  |  |
Credit agreements |  |  |  |
Number of financial institutions |  |  | 9 he_NumberOfFinancialInstitutions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Line of credit facility, reference rate | Adjusted LIBO Rate |  |  |
Actual capitalization ratio (as a percent) | 19.00%he_DebtInstrumentCovenantNonconsolidatedCapitalizationRatioActual / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
HEI | Maximum |  |  |  |
Credit agreements |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  |  | 50.00%he_DebtInstrumentCovenantNonconsolidatedCapitalizationRatio / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Hawaiian Electric Company, Inc (HECO) |  |  |  |
Credit agreements |  |  |  |
Number of financial institutions |  |  | 9 he_NumberOfFinancialInstitutions / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 65.00%he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatio / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 35.00%he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatio / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |
Actual ratio of consolidated debt to total consolidated capitalization (as a percent) | 58.00%he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatioActual / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |
HELCO |  |  |  |
Credit agreements |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) | 41.00%he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatioActual / dei_LegalEntityAxis = he_HawaiiElectricLightCompanyIncMember |  |  |
MECO |  |  |  |
Credit agreements |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) | 42.00%he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatioActual / dei_LegalEntityAxis = he_MauiElectricCompanyLimitedMember |  |  |
Commercial paper | HEI |  |  |  |
Short-term borrowings |  |  |  |
Outstanding amount | 119,000,000 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember | 105,000,000 us-gaap_OtherShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember |  |
Weighted-average interest rate (as a percent) | 0.70%us-gaap_ShortTermDebtWeightedAverageInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember | 0.70%us-gaap_ShortTermDebtWeightedAverageInterestRate / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_ShortTermDebtTypeAxis = us-gaap_CommercialPaperMember |  |
Line of credit facility | HEI |  |  |  |
Short-term borrowings |  |  |  |
Maximum capacity under syndicated credit facilities |  |  | 150,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 125,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Credit agreements |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) | 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |
Line of credit facility | Hawaiian Electric Company, Inc (HECO) |  |  |  |
Short-term borrowings |  |  |  |
Maximum capacity under syndicated credit facilities |  |  | 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | $ 175,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Credit agreements |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) | 0.175%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |
Line of credit facility | Adjusted LIBO Rate | HEI |  |  |  |
Credit agreements |  |  |  |
Line of credit facility basis point spread (as a percent) | 1.375%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = he_LondonInterbankOfferingRateLIBORAdjustedMember |  |  |
Line of credit facility | Adjusted LIBO Rate | Hawaiian Electric Company, Inc (HECO) |  |  |  |
Credit agreements |  |  |  |
Line of credit facility basis point spread (as a percent) | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = he_LondonInterbankOfferingRateLIBORAdjustedMember |  |  |

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