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Consolidated Statements of Capitalization - HECO (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Common stock, authorized shares	200,000,000	200,000,000
Common stock, outstanding shares	108,787,807	108,583,413
3.10% Refunding Series 2017A Due 2026
Debt instrument, stated interest rate	3.10%
4.00% Refunding Series 2017B, Due 2037
Debt instrument, stated interest rate	4.00%
3.25% Refunding Series 2015 SPRBs due 2025
Debt instrument, stated interest rate	3.25%
6.50%, series 2009, due 2039
Debt instrument, stated interest rate	6.50%
4.65%, series 2007A, due 2037
Debt instrument, stated interest rate	4.65%
Refunding Series 2007B Special Purpose Revenue Bonds
Debt instrument, stated interest rate	4.60%
4.31%, Series 2017A, due 2047
Debt instrument, stated interest rate	4.31%
4.54%, Series 2016A, due 2046
Debt instrument, stated interest rate	4.54%
5.23%, Series 2015A, due 2045
Debt instrument, stated interest rate	5.23%
3.83%, Series 2013A, due 2020
Debt instrument, stated interest rate	3.83%
4.45%, Series 2013A and 2013B, due 2022
Debt instrument, stated interest rate	4.45%
4.84%, Series 2013A, 2013B and 2013C, due 2027
Debt instrument, stated interest rate	4.84%
5.65%, Series 2013B and 2013C, due 2043
Debt instrument, stated interest rate	5.65%
3.79%, Series 2012A, due 2018
Debt instrument, stated interest rate	3.79%
4.03%, Series 2012B, due 2020
Debt instrument, stated interest rate	4.03%
4.55%, Series 2012B and 2012C, due 2023
Debt instrument, stated interest rate	4.55%
4.72%, Series 2012D, due 2029
Debt instrument, stated interest rate	4.72%
5.39%, Series 2012E, due 2042
Debt instrument, stated interest rate	5.39%
4.53%, Series 2012F, due 2032
Debt instrument, stated interest rate	4.53%
6.50 %, series 2004, Junior subordinated deferrable interest debentures, due 2034
Debt instrument, stated interest rate	6.50%
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock, par value (in dollars per share)	$ 6.667	$ 6.667
Common stock, authorized shares	50,000,000	50,000,000
Common stock, outstanding shares	16,142,216	16,019,785
Shares outstanding	1,234,657
Hawaiian Electric Company, Inc. and Subsidiaries | Series C, 4.25% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	150,000	150,000
Preferred stock, stated dividend rate	4.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Series D, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	50,000	50,000
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series E, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	150,000	150,000
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series H, 5.25% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	250,000	250,000
Preferred stock, stated dividend rate	5.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Series I, 5.00% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	89,657	89,657
Preferred stock, stated dividend rate	5.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Series J, 4.75% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	250,000	250,000
Preferred stock, stated dividend rate	4.75%
Hawaiian Electric Company, Inc. and Subsidiaries | Series K, 4.65% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 20
Shares outstanding	175,000	175,000
Preferred stock, stated dividend rate	4.65%
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $20 Par Value
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, Authorized shares	5,000,000	5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $100 Par Value
Preferred stock, par value (in dollars per share)	$ 100	$ 100
Preferred stock, Authorized shares	7,000,000	7,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Series G, 7.625% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding	70,000	70,000
Preferred stock, stated dividend rate	7.625%
Maui Electric Company, Limited (MECO) | Series H, 7.625% Preferred Stock
Preferred stock, par value (in dollars per share)	$ 100
Shares outstanding	50,000	50,000
Preferred stock, stated dividend rate	7.625%

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Face amount or stated value per share of common stock.

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