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Quarterly information (unaudited) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                                    
Revenues $ 658,597,000 $ 673,185,000 $ 632,281,000 $ 591,562,000 $ 617,395,000 $ 646,055,000 $ 566,244,000 $ 550,960,000             $ 2,555,625,000 $ 2,380,654,000 $ 2,602,982,000  
Operating income 84,988,000 109,545,000 75,896,000 67,862,000 88,427,000 105,442,000 85,455,000 68,851,000             338,291,000 348,175,000 322,553,000  
Net income 32,843,000 60,544,000 39,134,000 34,666,000 45,107,000 127,613,000 44,601,000 32,825,000             167,187,000 250,146,000 161,767,000  
Net income for common stock $ 32,370,000 $ 60,073,000 $ 38,661,000 $ 34,193,000 $ 44,634,000 $ 127,142,000 $ 44,128,000 $ 32,352,000             $ 165,297,000 $ 248,256,000 $ 159,877,000  
Basic earnings per common share (in dollars per share) $ 0.30 $ 0.55 $ 0.36 $ 0.31 $ 0.41 $ 1.17 $ 0.41 $ 0.30             $ 1.52 $ 2.30 $ 1.50  
Diluted earnings per common share (in dollars per share) 0.30 0.55 0.36 0.31 0.41 1.17 0.41 0.30             1.52 2.29 1.50  
Dividends declared per common share (in dollars per share) $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31             $ 1.24 $ 1.24 $ 1.24  
Net tax expense due to impact of the Tax Act $ 14,200,000                           $ 13,400,000      
Deferred tax expense (benefit) tax cuts and job act of 2017, adjustment for bonuses paid 700,000                                  
Net cash provided by operating activities                             420,441,000 $ 495,658,000 $ 356,858,000  
Net cash used in investing activities                             (815,299,000) (736,465,000) (705,724,000)  
Adjustment                                    
Condensed Financial Statements, Captions [Line Items]                                    
Net cash provided by operating activities       $ (42,000,000)                 $ (7,000,000) $ 33,000,000        
Net cash used in investing activities       42,000,000                 $ 7,000,000 $ (33,000,000)        
NextEra Energy, Inc Merger                                    
Condensed Financial Statements, Captions [Line Items]                                    
Merger contract termination fee           $ 90,000,000                        
Merger termination, merger expenses during the quarter           64,000,000 $ (2,000,000) $ (2,000,000) $ (2,000,000) $ (2,000,000) $ (7,000,000) $ (5,000,000)       (6,000,000) (16,000,000) $ (5,000,000)
Hawaiian Electric Company, Inc. and Subsidiaries                                    
Condensed Financial Statements, Captions [Line Items]                                    
Revenues 583,311,000 $ 598,769,000 $ 556,875,000 518,611,000 $ 544,668,000 572,253,000 495,395,000 482,052,000             2,257,566,000 2,094,368,000 2,335,166,000  
Operating income 66,460,000 87,076,000 55,047,000 48,938,000 68,644,000 89,812,000 70,686,000 55,326,000             257,521,000 284,468,000 274,116,000  
Net income 25,854,000 47,985,000 26,143,000 21,964,000 34,618,000 47,472,000 36,356,000 25,866,000             121,946,000 144,312,000 137,709,000  
Net income for common stock 25,355,000 $ 47,487,000 25,644,000 21,465,000 $ 34,119,000 $ 46,974,000 $ 35,857,000 $ 25,367,000             119,951,000 142,317,000 135,714,000  
Net tax expense due to impact of the Tax Act $ 9,200,000                           9,200,000      
Settlement agreement expiration, tax expense (benefit)     8,000,000 12,000,000                     20,000,000      
Settlement agreement expiration, revenue adjustment, net of taxes     $ 4,000,000 $ 7,000,000                            
Net cash provided by operating activities                             335,186,000 369,917,000 333,406,000  
Net cash used in investing activities                             $ (372,287,000) $ (288,199,000) $ (308,782,000)