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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- Statements of Income and Changes in Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 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
Expenses: |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | $ 172,762 us-gaap_Depreciation | $ 160,061 us-gaap_Depreciation | $ 150,389 us-gaap_Depreciation
Interest expense |  |  |  |  |  |  |  |  | 87,160 us-gaap_InterestExpense | 85,556 us-gaap_InterestExpense | 89,443 us-gaap_InterestExpense
Income before income taxes |  |  |  |  |  |  |  |  | 261,922 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 247,747 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 217,407 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefits |  |  |  |  |  |  |  |  | (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
Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 303 he_SalesRevenueAndInterestAndDividendsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 288 he_SalesRevenueAndInterestAndDividendsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 221 he_SalesRevenueAndInterestAndDividendsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 188,534 he_IncomeLossFromEquityMethodInvestmentsConsolidatedSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 180,359 he_IncomeLossFromEquityMethodInvestmentsConsolidatedSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 157,883 he_IncomeLossFromEquityMethodInvestmentsConsolidatedSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating, administrative and general |  |  |  |  |  |  |  |  | 20,921 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,063 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,191 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 575 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 596 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 672 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Taxes, other than income taxes |  |  |  |  |  |  |  |  | 469 he_TaxesOtherThanIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 497 he_TaxesOtherThanIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 421 he_TaxesOtherThanIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 11,599 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,207 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16,695 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes |  |  |  |  |  |  |  |  | 155,273 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 147,284 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 124,125 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefits |  |  |  |  |  |  |  |  | 13,047 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,232 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14,533 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 168,320 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 161,516 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 138,658 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Total revenue from sale of goods and services, including interest and dividends, rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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