Consolidated Statements of Changes in Common Stock Equity (unaudited) - HECO - USD ($) $ in Thousands	Total	Hawaiian Electric Company, Inc. and Subsidiaries	Common stock Hawaiian Electric Company, Inc. and Subsidiaries	Premium on capital stock Hawaiian Electric Company, Inc. and Subsidiaries	Retained Earnings	Retained Earnings Hawaiian Electric Company, Inc. and Subsidiaries	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Hawaiian Electric Company, Inc. and Subsidiaries
Beginning Balance at Dec. 31, 2013	$ 1,726,406	$ 1,593,564	$ 102,880	$ 541,452	$ 255,030	$ 948,624	$ (16,750)	$ 608
Balance (in shares) at Dec. 31, 2013			15,429,000
Increase (decrease) in stockholders' equity
Net income for common stock	87,068	69,650			87,068	69,650
Other comprehensive income, net of taxes	4,067	22					4,067	22
Common stock dividends	(62,916)	(44,246)			(62,916)	(44,246)
Common stock issuance expenses		(3)		(3)
Ending Balance at Jun. 30, 2014	1,759,935	1,618,987	$ 102,880	541,449	279,182	974,028	(12,683)	630
Balance (in shares) at Jun. 30, 2014			15,429,000
Beginning Balance at Dec. 31, 2014	$ 1,790,573	1,682,144	$ 105,388	578,938	296,654	997,773	(27,378)	45
Balance (in shares) at Dec. 31, 2014	102,565,266		15,805,000
Increase (decrease) in stockholders' equity
Net income for common stock	$ 66,884	59,715			66,884	59,715
Other comprehensive income, net of taxes	931	7					931	7
Common stock dividends	(65,140)	(45,203)			(65,140)	(45,203)
Common stock issuance expenses		(5)		(5)
Ending Balance at Jun. 30, 2015	$ 1,898,520	$ 1,696,658	$ 105,388	$ 578,933	$ 298,398	$ 1,012,285	$ (26,447)	$ 52
Balance (in shares) at Jun. 30, 2015	107,446,530		15,805,000