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Electric utility segment Consolidating Statement of Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended
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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 | May 31, 2013
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | $ 2,910,618 us-gaap_CostsAndExpenses | $ 2,923,051 us-gaap_CostsAndExpenses | $ 3,090,799 us-gaap_CostsAndExpenses |
Total operating income | 67,241 us-gaap_OperatingIncomeLoss | 91,102 us-gaap_OperatingIncomeLoss | 82,275 us-gaap_OperatingIncomeLoss | 88,306 us-gaap_OperatingIncomeLoss | 78,349 us-gaap_OperatingIncomeLoss | 88,038 us-gaap_OperatingIncomeLoss | 80,207 us-gaap_OperatingIncomeLoss | 68,825 us-gaap_OperatingIncomeLoss | 328,924 us-gaap_OperatingIncomeLoss | 315,419 us-gaap_OperatingIncomeLoss | 284,196 us-gaap_OperatingIncomeLoss |
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 6,771 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 5,561 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity | 7,007 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity |
Allowance for borrowed funds used during construction |  |  |  |  |  |  |  |  | 2,579 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest | 2,246 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest | 4,355 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest |
Income before income taxes |  |  |  |  |  |  |  |  | 261,922 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 247,747 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 217,407 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
Income taxes |  |  |  |  |  |  |  |  | 91,712 us-gaap_IncomeTaxExpenseBenefit | 84,341 us-gaap_IncomeTaxExpenseBenefit | 76,859 us-gaap_IncomeTaxExpenseBenefit |
Net income | 33,630 us-gaap_ProfitLoss | 48,286 us-gaap_ProfitLoss | 41,894 us-gaap_ProfitLoss | 46,400 us-gaap_ProfitLoss | 39,486 us-gaap_ProfitLoss | 48,707 us-gaap_ProfitLoss | 41,061 us-gaap_ProfitLoss | 34,152 us-gaap_ProfitLoss | 170,210 us-gaap_ProfitLoss | 163,406 us-gaap_ProfitLoss | 140,548 us-gaap_ProfitLoss |
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 1,890 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable | 1,890 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable | 1,890 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable |
Net income for common stock | 33,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 47,815 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 41,421 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 45,927 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 39,013 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 48,236 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 40,588 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 33,679 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 168,320 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 161,516 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 138,658 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
HECO |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,142,245 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,124,174 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,228,233 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Fuel oil |  |  |  |  |  |  |  |  | 821,246 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 851,365 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 945,246 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Purchased power |  |  |  |  |  |  |  |  | 537,821 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 527,839 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 540,802 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Other operation and maintenance |  |  |  |  |  |  |  |  | 283,532 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 283,768 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 266,208 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Depreciation |  |  |  |  |  |  |  |  | 109,204 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 99,738 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 90,783 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 201,426 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 200,962 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 209,943 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Impairment of utility assets |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 29,000 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Total expenses |  |  |  |  |  |  |  |  | 1,953,229 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,963,672 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,081,982 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Total operating income |  |  |  |  |  |  |  |  | 189,016 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 160,502 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 146,251 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 6,085 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4,495 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5,735 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 40,964 he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 41,410 he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 28,836 he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Interest expense and other charges, net |  |  |  |  |  |  |  |  | (44,041)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (39,107)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (40,842)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Allowance for borrowed funds used during construction |  |  |  |  |  |  |  |  | 2,306 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,814 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 3,642 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income before income taxes |  |  |  |  |  |  |  |  | 194,330 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 169,114 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 143,622 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Income taxes |  |  |  |  |  |  |  |  | 55,609 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 45,105 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 43,266 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income |  |  |  |  |  |  |  |  | 138,721 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 124,009 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 100,356 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | 138,721 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 124,009 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 100,356 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Preferred stock dividends of Hawaiian Electric |  |  |  |  |  |  |  |  | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Net income for common stock |  |  |  |  |  |  |  |  | 137,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 122,929 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 99,276 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
HELCO |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 422,200 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 431,517 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 441,013 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Fuel oil |  |  |  |  |  |  |  |  | 117,215 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 125,516 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 116,866 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Purchased power |  |  |  |  |  |  |  |  | 123,226 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 128,368 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 145,386 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Other operation and maintenance |  |  |  |  |  |  |  |  | 65,471 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 61,418 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 60,447 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Depreciation |  |  |  |  |  |  |  |  | 35,904 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 34,188 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 33,337 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 39,521 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 40,092 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 41,370 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Impairment of utility assets |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 5,500 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Total expenses |  |  |  |  |  |  |  |  | 381,337 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 389,582 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 402,906 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Total operating income |  |  |  |  |  |  |  |  | 40,863 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 41,935 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 38,107 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 472 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 643 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 585 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Interest expense and other charges, net |  |  |  |  |  |  |  |  | (11,030)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesTwoMember | (11,341)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesTwoMember | (12,066)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Allowance for borrowed funds used during construction |  |  |  |  |  |  |  |  | 182 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 263 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 235 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Income before income taxes |  |  |  |  |  |  |  |  | 30,487 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 31,500 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 26,861 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Income taxes |  |  |  |  |  |  |  |  | 11,264 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 10,830 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 10,115 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Net income |  |  |  |  |  |  |  |  | 19,223 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 20,670 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 16,746 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 534 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 534 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 534 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | 18,689 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 20,136 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 16,212 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
Net income for common stock |  |  |  |  |  |  |  |  | 18,689 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 20,136 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember | 16,212 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesTwoMember |
MECO |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 422,965 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 424,603 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 440,270 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 5,300 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_SubsidiariesThreeMember
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Fuel oil |  |  |  |  |  |  |  |  | 193,224 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 208,671 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 235,307 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Purchased power |  |  |  |  |  |  |  |  | 60,961 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 54,474 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 38,052 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Other operation and maintenance |  |  |  |  |  |  |  |  | 61,609 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 58,081 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 70,771 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Depreciation |  |  |  |  |  |  |  |  | 21,279 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 20,099 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 20,378 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 39,916 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 40,077 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 41,528 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Impairment of utility assets |  |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 5,500 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Total expenses |  |  |  |  |  |  |  |  | 376,989 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 381,402 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 411,536 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Total operating income |  |  |  |  |  |  |  |  | 45,976 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 43,201 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 28,734 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 214 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 423 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 687 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Interest expense and other charges, net |  |  |  |  |  |  |  |  | (9,773)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesThreeMember | (8,953)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesThreeMember | (9,224)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Allowance for borrowed funds used during construction |  |  |  |  |  |  |  |  | 91 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 169 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 478 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Income before income taxes |  |  |  |  |  |  |  |  | 36,508 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 34,840 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 20,675 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Income taxes |  |  |  |  |  |  |  |  | 13,852 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 13,182 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 7,667 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Net income |  |  |  |  |  |  |  |  | 22,656 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 21,658 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 13,008 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 381 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 381 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 381 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | 22,275 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 21,277 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 12,627 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Net income for common stock |  |  |  |  |  |  |  |  | 22,275 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 21,277 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember | 12,627 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_SubsidiariesThreeMember |
Other subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |  |  |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 3 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | 3 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Total expenses |  |  |  |  |  |  |  |  | 0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | 3 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | 3 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Total operating income |  |  |  |  |  |  |  |  | 0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Income before income taxes |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Income taxes |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |  |  |
Net income |  |  |  |  |  |  |  |  | 0 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Net income for common stock |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember | (3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_RenewableHawaiiCompanyMember |
Consolidating adjustments |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (87)us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (122)us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (77)us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (87)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (122)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (77)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (40,964)he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (41,410)he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (28,836)he_EquityInEarningsOfSubsidiaries / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Interest expense and other charges, net |  |  |  |  |  |  |  |  | 87 he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 122 he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | 77 he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Income before income taxes |  |  |  |  |  |  |  |  | (40,964)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (41,410)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (28,836)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Income taxes |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |  |  |
Net income |  |  |  |  |  |  |  |  | (40,964)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (41,410)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (28,836)us-gaap_ProfitLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | (40,964)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (41,410)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (28,836)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
Net income for common stock |  |  |  |  |  |  |  |  | (40,964)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (41,410)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember | (28,836)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_ConsolidationReclassificationsAndEliminationsMember |
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,987,323 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 2,980,172 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 3,109,439 us-gaap_RegulatedOperatingRevenueElectricNonNuclear / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Expenses |  |  |  |  |  |  |  |  |  |  |  |
Fuel oil |  |  |  |  |  |  |  |  | 1,131,685 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,185,552 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,297,419 us-gaap_UtilitiesOperatingExpenseFuelUsed / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Purchased power |  |  |  |  |  |  |  |  | 722,008 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 710,681 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 724,240 us-gaap_UtilitiesOperatingExpensePurchasedPower / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Other operation and maintenance |  |  |  |  |  |  |  |  | 410,612 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 403,270 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 397,429 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Depreciation |  |  |  |  |  |  |  |  | 166,387 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 154,025 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 144,498 us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 280,863 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 281,131 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 292,841 he_UtilitiesOperatingExpenseOtherTaxes / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Impairment of utility assets |  |  |  |  |  |  |  |  | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 0 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 40,000 us-gaap_AssetImpairmentCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Total expenses |  |  |  |  |  |  |  |  | 2,711,555 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 2,734,659 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 2,896,427 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Total operating income | 58,878 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 76,156 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 70,068 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 70,666 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 65,564 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 69,853 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 58,975 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 51,121 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 275,768 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 245,513 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 213,012 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 6,771 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 5,561 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 7,007 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Interest expense and other charges, net |  |  |  |  |  |  |  |  | (64,757)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (59,279)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | (62,055)he_InterestExpenseAndOtherCharges / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Allowance for borrowed funds used during construction |  |  |  |  |  |  |  |  | 2,579 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 2,246 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 4,355 us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Income before income taxes |  |  |  |  |  |  |  |  | 220,361 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 194,041 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 162,319 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Income taxes |  |  |  |  |  |  |  |  | 80,725 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 69,117 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 61,048 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Net income | 29,611 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 39,377 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 34,729 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 35,919 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 32,489 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 38,315 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 29,192 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 24,928 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 139,636 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 124,924 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 101,271 us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Preferred stock dividends of subsidiaries |  |  |  |  |  |  |  |  | 915 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 915 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 915 us-gaap_NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Net income attributable to Hawaiian Electric |  |  |  |  |  |  |  |  | 138,721 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 124,009 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 100,356 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Preferred stock dividends of Hawaiian Electric |  |  |  |  |  |  |  |  | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | 1,080 us-gaap_PreferredStockDividendsIncomeStatementImpact / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |
Net income for common stock | $ 29,112 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 38,879 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 34,230 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 35,420 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 31,990 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 37,817 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 28,693 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 24,429 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 137,641 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 122,929 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember | $ 99,276 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember |

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