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Quarterly information (unaudited) (Details) (USD $) 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
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 790,040us-gaap_Revenues	$ 867,096us-gaap_Revenues	$ 798,657us-gaap_Revenues	$ 783,749us-gaap_Revenues	$ 832,503us-gaap_Revenues	$ 829,168us-gaap_Revenues	$ 794,567us-gaap_Revenues	$ 782,232us-gaap_Revenues	$ 3,239,542us-gaap_Revenues	$ 3,238,470us-gaap_Revenues	$ 3,374,995us-gaap_Revenues
Operating income	67,241us-gaap_OperatingIncomeLoss	91,102us-gaap_OperatingIncomeLoss	82,275us-gaap_OperatingIncomeLoss	88,306us-gaap_OperatingIncomeLoss	78,349us-gaap_OperatingIncomeLoss	88,038us-gaap_OperatingIncomeLoss	80,207us-gaap_OperatingIncomeLoss	68,825us-gaap_OperatingIncomeLoss	328,924us-gaap_OperatingIncomeLoss	315,419us-gaap_OperatingIncomeLoss	284,196us-gaap_OperatingIncomeLoss
Net income	33,630us-gaap_ProfitLoss	48,286us-gaap_ProfitLoss	41,894us-gaap_ProfitLoss	46,400us-gaap_ProfitLoss	39,486us-gaap_ProfitLoss	48,707us-gaap_ProfitLoss	41,061us-gaap_ProfitLoss	34,152us-gaap_ProfitLoss	170,210us-gaap_ProfitLoss	163,406us-gaap_ProfitLoss	140,548us-gaap_ProfitLoss
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
Basic earnings per common share (in dollars per share)	$ 0.32us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.34us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic	$ 1.43us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.32us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.39us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 1.64us-gaap_EarningsPerShareDiluted	$ 1.62us-gaap_EarningsPerShareDiluted	$ 1.42us-gaap_EarningsPerShareDiluted
Dividends per common share (in dollars per share)	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 0.31us-gaap_CommonStockDividendsPerShareDeclared	$ 1.24us-gaap_CommonStockDividendsPerShareDeclared	$ 1.24us-gaap_CommonStockDividendsPerShareDeclared	$ 1.24us-gaap_CommonStockDividendsPerShareDeclared
Market price per common share
High end of range (in dollars per share)	$ 35.00he_CommonStockMarketPricePerShareHighEndOfRange	$ 26.89he_CommonStockMarketPricePerShareHighEndOfRange	$ 25.65he_CommonStockMarketPricePerShareHighEndOfRange	$ 26.80he_CommonStockMarketPricePerShareHighEndOfRange	$ 27.15he_CommonStockMarketPricePerShareHighEndOfRange	$ 27.24he_CommonStockMarketPricePerShareHighEndOfRange	$ 28.30he_CommonStockMarketPricePerShareHighEndOfRange	$ 27.92he_CommonStockMarketPricePerShareHighEndOfRange	$ 35.00he_CommonStockMarketPricePerShareHighEndOfRange	$ 28.30he_CommonStockMarketPricePerShareHighEndOfRange
Low end of range (in dollars per share)	$ 26.04he_CommonStockMarketPricePerShareLowEndOfRange	$ 22.71he_CommonStockMarketPricePerShareLowEndOfRange	$ 23.04he_CommonStockMarketPricePerShareLowEndOfRange	$ 24.39he_CommonStockMarketPricePerShareLowEndOfRange	$ 24.51he_CommonStockMarketPricePerShareLowEndOfRange	$ 24.12he_CommonStockMarketPricePerShareLowEndOfRange	$ 23.84he_CommonStockMarketPricePerShareLowEndOfRange	$ 25.50he_CommonStockMarketPricePerShareLowEndOfRange	$ 22.71he_CommonStockMarketPricePerShareLowEndOfRange	$ 23.84he_CommonStockMarketPricePerShareLowEndOfRange
Hawaiian Electric Company, Inc. and Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Revenues	725,267us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	803,565us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	738,429us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	720,062us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	770,152us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	764,054us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	728,525us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	717,441us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	2,987,323us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	2,980,172us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	3,109,439us-gaap_Revenues / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Operating income	58,878us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	76,156us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	70,068us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	70,666us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	65,564us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	69,853us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	58,975us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	51,121us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	275,768us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	245,513us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	213,012us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
Net income	29,611us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	39,377us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	34,729us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	35,919us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	32,489us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	38,315us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	29,192us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	24,928us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	139,636us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	124,924us-gaap_ProfitLoss / dei_LegalEntityAxis = he_HawaiianElectricCompanyAndSubsidiariesMember	101,271us-gaap_ProfitLoss / 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

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