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v2.4.1.9

Summary of significant accounting policies (Details 3) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 us-gaap_EarningsPerShareBasicDistributed | $ 1.24 us-gaap_EarningsPerShareBasicDistributed | $ 1.24 us-gaap_EarningsPerShareBasicDistributed
Undistributed earnings (loss) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.41 us-gaap_EarningsPerShareBasicUndistributed | $ 0.39 us-gaap_EarningsPerShareBasicUndistributed | $ 0.19 us-gaap_EarningsPerShareBasicUndistributed
Earnings Per Share, basic (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.47 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 1.65 us-gaap_EarningsPerShareBasic | $ 1.63 us-gaap_EarningsPerShareBasic | $ 1.43 us-gaap_EarningsPerShareBasic
Diluted |  |  |  |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.24 us-gaap_EarningsPerShareDilutedDistributed | $ 1.24 us-gaap_EarningsPerShareDilutedDistributed | $ 1.24 us-gaap_EarningsPerShareDilutedDistributed
Undistributed earnings (losses) (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.40 us-gaap_EarningsPerShareDilutedUndistributed | $ 0.38 us-gaap_EarningsPerShareDilutedUndistributed | $ 0.18 us-gaap_EarningsPerShareDilutedUndistributed
Earnings Per Share, diluted (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.46 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 1.64 us-gaap_EarningsPerShareDiluted | $ 1.62 us-gaap_EarningsPerShareDiluted | $ 1.42 us-gaap_EarningsPerShareDiluted
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |
Amount reclassified form other assets to plant and equipment | $ 6,399,724,000 us-gaap_PropertyPlantAndEquipmentGross |  |  |  | $ 6,057,936,000 us-gaap_PropertyPlantAndEquipmentGross |  |  |  | $ 6,399,724,000 us-gaap_PropertyPlantAndEquipmentGross | $ 6,057,936,000 us-gaap_PropertyPlantAndEquipmentGross |
Other assets | 541,542,000 us-gaap_OtherAssets |  |  |  | 512,627,000 us-gaap_OtherAssets |  |  |  | 541,542,000 us-gaap_OtherAssets | 512,627,000 us-gaap_OtherAssets |
Accounts Receivable |  |  |  |  |  |  |  |  |  |  |
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable | 2,000,000 he_AllowanceForDoubtfulAccountsReceivableAccruedUnbilledRevenuesAndOtherAccountsReceivable |  |  |  | 2,000,000 he_AllowanceForDoubtfulAccountsReceivableAccruedUnbilledRevenuesAndOtherAccountsReceivable |  |  |  | 2,000,000 he_AllowanceForDoubtfulAccountsReceivableAccruedUnbilledRevenuesAndOtherAccountsReceivable | 2,000,000 he_AllowanceForDoubtfulAccountsReceivableAccruedUnbilledRevenuesAndOtherAccountsReceivable |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 us-gaap_Goodwill |  |  |  | 82,190,000 us-gaap_Goodwill |  |  |  | 82,190,000 us-gaap_Goodwill | 82,190,000 us-gaap_Goodwill |
Fair value excess over carrying value (percent) | 60.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount |  |  |  |  |  |  |  | 60.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Electric utility revenues |  |  |  |  |  |  |  |  |  |  |
Revenue taxes included in revenues and in taxes, other than income taxes expense |  |  |  |  |  |  |  |  | 267,000,000 he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 266,000,000 he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 280,000,000 he_ElectricUtilityRevenueTaxesIncludedInOperatingRevenuesAndInTaxesOtherThanIncomeTaxesExpense / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Weighted average AFUDC rate (as a percent) |  |  |  |  |  |  |  |  | 7.70%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 7.60%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 7.60%us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction |  |  |  |  |  |  |  |  |  |  |
Contributions amortized period |  |  |  |  |  |  |  |  | 30 years |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction |  |  |  |  |  |  |  |  |  |  |
Contributions amortized period |  |  |  |  |  |  |  |  | 55 years |  |
Bank |  |  |  |  |  |  |  |  |  |  |
Loans modified in a troubled debt restructuring |  |  |  |  |  |  |  |  |  |  |
Number of consecutive months of repayment required for loans to be removed from nonaccrual status |  |  |  |  |  |  |  |  | 6 months |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember |  |  |  | 82,190,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember |  |  |  | 82,190,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember | 82,190,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember |
Stock appreciation rights (SARs) | Common stock |  |  |  |  |  |  |  |  |  |  |
Antidilutive effect of stock appreciation rights (SARs) |  |  |  |  |  |  |  |  |  |  |
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares) |  |  |  |  |  |  |  |  |  | 102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockAppreciationRightsSARSMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
American Savings Bank (ASB) |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |
Other assets | 304,435,000 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 268,063,000 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 304,435,000 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 268,063,000 us-gaap_OtherAssets / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |
Goodwill | 82,190,000 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 82,190,000 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 82,190,000 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 82,190,000 us-gaap_Goodwill / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Antidilutive effect of stock appreciation rights (SARs) |  |  |  |  |  |  |  |  |  |  |
Commitments to fund affordable housing investments | 14,800,000 us-gaap_AffordableHousingProgramObligation / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 600,000 us-gaap_AffordableHousingProgramObligation / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 14,800,000 us-gaap_AffordableHousingProgramObligation / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 600,000 us-gaap_AffordableHousingProgramObligation / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Affordable housing investment, carrying value | 32,457,000 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 14,543,000 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |  |  |  | 32,457,000 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember | 14,543,000 he_AffordableHousingProgramEquityInvestment / dei_LegalEntityAxis = he_AmericanSavingsBankFSBMember |
Restatement adjustment |  |  |  |  |  |  |  |  |  |  |
Summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |
Amount reclassified form other assets to plant and equipment |  |  |  |  | 7,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  | 7,000,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
Other assets |  |  |  |  | $ (7,000,000)us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |  |  |  |  | $ (7,000,000)us-gaap_OtherAssets / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |

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