Consolidated Balance Sheets (unaudited) (Parenthetical) - HECO - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Common stock, authorized shares (in shares)	200,000,000	200,000,000
Common stock, outstanding shares (in shares)	107,458,641	102,565,266
Hawaiian Electric Company, Inc. and Subsidiaries
Nonutility property, plant and equipment, accumulated depreciation	$ 1,228	$ 1,227
Common stock, par value (in dollars per share)	$ 6.67	$ 6.67
Common stock, authorized shares (in shares)	50,000,000	50,000,000
Common stock, outstanding shares (in shares)	15,805,327	15,805,327