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Electric utility segment Consolidating Statements of Changes in Common Stock Equity (Details) (USD $)
In Thousands, 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
Beginning Balance       $ 1,727,070us-gaap_StockholdersEquity       $ 1,593,865us-gaap_StockholdersEquity $ 1,727,070us-gaap_StockholdersEquity $ 1,593,865us-gaap_StockholdersEquity $ 1,528,706us-gaap_StockholdersEquity
Net income for common stock 33,157us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 47,815us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 41,421us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 45,927us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 39,013us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 48,236us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 40,588us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 33,679us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 168,320us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 161,516us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 138,658us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Other comprehensive income (loss), net of tax benefits                 (10,628)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 9,673us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (7,286)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Issuance of common stock, net of expenses                 2,461he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan 41,692he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan 41,295he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
Common stock dividends                 (126,505)us-gaap_DividendsCommonStockCash (122,626)us-gaap_DividendsCommonStockCash (120,150)us-gaap_DividendsCommonStockCash
Ending Balance 1,791,428us-gaap_StockholdersEquity       1,727,070us-gaap_StockholdersEquity       1,791,428us-gaap_StockholdersEquity 1,727,070us-gaap_StockholdersEquity 1,593,865us-gaap_StockholdersEquity
HECO                      
Beginning Balance       1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,402,841us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Net income for common stock                 137,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
122,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
99,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Other comprehensive income (loss), net of tax benefits                 (563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,578us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Issuance of common stock, net of expenses                 39,994he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
78,499he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
44,001he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Common stock dividends                 (88,492)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(81,578)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(73,044)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Ending Balance 1,682,144us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
      1,682,144us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
HELCO                      
Beginning Balance       274,802us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
      268,908us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
274,802us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
268,908us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
280,468us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
Net income for common stock                 18,689us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
20,136us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
16,212us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
Other comprehensive income (loss), net of tax benefits                 (18)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
145us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
(34)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
Issuance of common stock, net of expenses                     0he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
Common stock dividends                 (11,627)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
(14,387)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
(27,738)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
Ending Balance 281,846us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
      274,802us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
      281,846us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
274,802us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
268,908us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesTwoMember
MECO                      
Beginning Balance       248,771us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
      228,927us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
248,771us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
228,927us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
235,568us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Net income for common stock                 22,275us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
21,277us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
12,627us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Other comprehensive income (loss), net of tax benefits                 (5)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
123us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
(71)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Issuance of common stock, net of expenses                   12,461he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
0he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Common stock dividends                 (14,349)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
(14,017)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
(19,197)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Ending Balance 256,692us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
      248,771us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
      256,692us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
248,771us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
228,927us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_SubsidiariesThreeMember
Other subsidiaries                      
Beginning Balance       101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
      104us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
104us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
107us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
Net income for common stock                 0us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
(3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
(3)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
Other comprehensive income (loss), net of tax benefits                     0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
Issuance of common stock, net of expenses                     0he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
Ending Balance 101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
      101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
      101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
101us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
104us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_RenewableHawaiiCompanyMember
Consolidating adjustments                      
Beginning Balance       (523,674)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
      (497,939)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(523,674)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(497,939)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(516,143)us-gaap_StockholdersEquity
/ 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
Other comprehensive income (loss), net of tax benefits                 23us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(268)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
105us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
Issuance of common stock, net of expenses                   (12,461)he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
0he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
Common stock dividends                 25,976us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
28,404us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
46,935us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
Ending Balance (538,639)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
      (523,674)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
      (538,639)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(523,674)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
(497,939)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_ConsolidationReclassificationsAndEliminationsMember
HECO Consolidated                      
Beginning Balance       1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
      1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
1,402,841us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Net income for common stock 29,112us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
38,879us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
34,230us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
35,420us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
31,990us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
37,817us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
28,693us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
24,429us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
137,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
122,929us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
99,276us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Other comprehensive income (loss), net of tax benefits                 (563)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
1,578us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
(938)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Issuance of common stock, net of expenses                 39,994he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
78,499he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
44,001he_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlan
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Common stock dividends                 (88,492)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
(81,578)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
(73,044)us-gaap_DividendsCommonStockCash
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
Ending Balance $ 1,682,144us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
      $ 1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
      $ 1,682,144us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
$ 1,593,564us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember
$ 1,472,136us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= he_HawaiianElectricCompanyAndSubsidiariesMember