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Long-term debt (Details) (USD $)					0 Months Ended									0 Months Ended			1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Special purpose revenue bonds issued on behalf of electric utility subsidiaries	Dec. 31, 2012 Special purpose revenue bonds issued on behalf of electric utility subsidiaries	Mar. 07, 2013 HEI medium-term note 5.25%, due 2013	Dec. 31, 2013 HEI medium-term note 5.25%, due 2013	Dec. 31, 2012 HEI medium-term note 5.25%, due 2013	Dec. 31, 2013 HEI medium-term note 6.51%, due 2014	Dec. 31, 2012 HEI medium-term note 6.51%, due 2014	Dec. 31, 2013 HEI senior note 4.41%, due 2016	Dec. 31, 2012 HEI senior note 4.41%, due 2016	Dec. 31, 2013 HEI senior note 5.67%, due 2021	Dec. 31, 2012 HEI senior note 5.67%, due 2021	Mar. 06, 2013 HEI senior note 3.99%, due 2023	Dec. 31, 2013 HEI senior note 3.99%, due 2023	Dec. 31, 2012 HEI senior note 3.99%, due 2023	Oct. 31, 2013 Special Purpose Revenue Bonds	Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes [Member] Senior notes	Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due July, 2020, 3.83% Senior notes	Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due December, 2022, 4.45% Senior notes	Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due October, 2027, 4.84% Senior notes	Oct. 03, 2013 Hawaiian Electric Consolidated, Senior Notes Due October, 2043, 5.65% Senior notes	Oct. 03, 2013 Hawaiian Electric Notes, Senior Notes Senior notes	Oct. 03, 2013 Hawaiian Electric, Senior Notes Due December, 2022, 4.45% Senior notes	Oct. 03, 2013 Hawaiian Electric, Senior Notes Due October, 2027, 4.84% Senior notes	Oct. 03, 2013 Hawaiian Electric, Senior Notes Due October, 2043, 5.65% Senior notes	Oct. 03, 2013 Hawaii Electric Light Notes, Senior Notes Senior notes	Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due July, 2020, 3.83% Senior notes	Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due December, 2022, 4.45% Senior notes	Oct. 03, 2013 Hawaiian Electric Light, Senior Notes Due October, 2027, 4.84% Senior notes	Oct. 03, 2013 Maui Electric Notes, Senior Notes Senior notes	Oct. 03, 2013 Maui Electric, Senior Notes Due October, 2027, 4.84% Senior notes	Oct. 03, 2013 Maui Electric, Senior Notes Due October, 2043, 5.65% Senior notes	Oct. 03, 2013 4.75%, refunding series 2003A, due 2020 Senior notes	Oct. 03, 2013 5.00%, refunding series 2003B, due 2022 Senior notes	Oct. 03, 2013 5.65%, refunding series 1997A, due 2027 Senior notes	Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries
Long-term debt
Long-term debt	$ 1,492,945,000	$ 1,422,872,000	$ 1,217,945,000	$ 1,147,872,000		$ 0	$ 50,000,000	$ 100,000,000	$ 100,000,000	$ 75,000,000	$ 75,000,000	$ 50,000,000	$ 50,000,000		$ 50,000,000	$ 0
Debt instrument, stated interest rate (as a percent)						5.25%	5.25%	6.51%	6.51%	4.41%	4.41%	5.67%	5.67%	3.99%	3.99%	3.99%								4.45%	4.84%	5.65%		3.83%	4.45%	4.84%		4.84%	5.65%	4.75%	5.00%	5.65%
Aggregate principal payments
2014	111,000,000																																				11,000,000
2015	0																																				0
2016	75,000,000																																				0
2017	0																																				0
2018	50,000,000																																				50,000,000
Additional borrowings														50,000,000
Refinancing of unsecured debt payable					50,000,000
Senior notes, face amount																		236,000,000	14,000,000	52,000,000	100,000,000	70,000,000	140,000,000	40,000,000	50,000,000	50,000,000	56,000,000	14,000,000	12,000,000	30,000,000	40,000,000	20,000,000	20,000,000
Bonds redeemed																	$ 166,000,000

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