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Share-based compensation LTIP Awards Linked To Other Performance Conditions (Details) (LTIP awards linked to other performance conditions, USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
LTIP awards linked to other performance conditions |  |  |
Share-based Compensation, Long Term Incentive Plan [Roll Forward] |  |  |
Outstanding, beginning of period (in shares) | 296,843 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 247,175 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 182,498 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Outstanding, beginning of period (in dollars per share) | $ 26.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 25.04 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 22.63 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Granted (in shares) | 129,603 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 120,399 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 125,157 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Granted (in dollars per share) | $ 25.18 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 26.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 26.05 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Vested (in shares) | (65,089)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | (18,280)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Vested (in dollars per share) | $ 24.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 18.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Increased above target (cancelled) (in shares) | 4,949 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | (41,599)he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | (50,786)he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Increased above target (cancelled) (in dollars per share) | $ 26.70 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 24.97 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 18.95 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Forfeited (in shares) | (1,575)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | (10,852)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | (9,694)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Forfeited (in dollars per share) | $ 26.07 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 26.20 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 24.44 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionForfeitedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Outstanding, end of period (in shares) | 364,731 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 296,843 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | 247,175 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Outstanding, end of period (in dollars per share) | $ 26.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 26.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 25.04 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember
Total weighted-average grant-date fair value | $ 3.3 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 3.2 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember | $ 3.3 he_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodTotalFairValue / us-gaap_AwardTypeAxis = he_LongTermIncentivePlanAwardsLinkedToOtherPerformanceConditionsMember

X
- Definition Represents the weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan or when performance conditions met. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were cancelled during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the cancelled in during the period. + References No definition available. + Details
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- Definition Represents the total weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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