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Retirement benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Defined Benefit Plan      
Contributions made to defined benefit plans $ 9,000 $ 17,000  
Contributions expected to be paid in current year 52,000   $ 71,000
Expected payments for remainder of fiscal year 3,000   2,000
Retirement benefits expense $ 11,000 15,000  
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case (in years) 5 years    
Defined contribution plan, expenses recognized $ 1,700 1,800  
Cash contributions by the employer to defined contribution plan 1,800 3,200  
Defined Contribution Plan Disclosure [Line Items]      
Cash contributions by the employer to defined contribution plan 1,800 3,200  
American Savings Bank (ASB)      
Defined Benefit Plan      
Contributions expected to be paid in current year 0   0
Hawaiian Electric Industries, Inc.      
Defined Benefit Plan      
Contributions expected to be paid in current year 1,000   1,000
Hawaiian Electric Company, Inc. and Subsidiaries      
Defined Benefit Plan      
Contributions made to defined benefit plans 9,000 17,000  
Contributions expected to be paid in current year 51,000   70,000
Expected payments for remainder of fiscal year 1,000   $ 1,000
Retirement benefits expense 12,000 14,000  
Defined contribution plan, expenses recognized 800 700  
Cash contributions by the employer to defined contribution plan 800 700  
Defined Contribution Plan Disclosure [Line Items]      
Cash contributions by the employer to defined contribution plan 800 700  
Pension benefits      
Defined Benefit Plan      
Service cost 20,464 18,363  
Interest cost 18,801 20,163  
Expected return on plan assets (33,067) (28,466)  
Amortization of net prior period (gain)/cost 0 3  
Amortization of net actuarial losses1 1,556 8,057  
Net periodic pension/benefit cost (return) 7,754 18,120  
Impact of PUC D&Os 11,167 6,262  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 18,921 24,382  
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined Benefit Plan      
Service cost 19,994 17,891  
Interest cost 17,531 18,715  
Expected return on plan assets (31,368) (26,855)  
Amortization of net prior period (gain)/cost 0 2  
Amortization of net actuarial losses1 2,559 7,368  
Net periodic pension/benefit cost (return) 8,716 17,121  
Impact of PUC D&Os 11,167 6,262  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 19,883 23,383  
Other benefits      
Defined Benefit Plan      
Service cost 705 631  
Interest cost 1,569 1,855  
Expected return on plan assets (3,233) (3,038)  
Amortization of net prior period (gain)/cost (383) (440)  
Amortization of net actuarial losses1 254 50  
Net periodic pension/benefit cost (return) (1,088) (942)  
Impact of PUC D&Os 970 777  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (118) (165)  
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined Benefit Plan      
Service cost 699 626  
Interest cost 1,504 1,782  
Expected return on plan assets (3,182) (2,990)  
Amortization of net prior period (gain)/cost (383) (440)  
Amortization of net actuarial losses1 250 51  
Net periodic pension/benefit cost (return) (1,112) (971)  
Impact of PUC D&Os 970 777  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ (142) $ (194)