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Retirement benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Defined Benefit Plan          
Expected payments for remainder of fiscal year $ 2,000   $ 2,000   $ 2,000
Retirement benefits expense     $ 46,000 $ 44,000  
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     $ 5,500 5,100  
Cash contributions by the employer to defined contribution plan     6,000 6,000  
Hawaiian Electric Company, Inc. and Subsidiaries          
Defined Benefit Plan          
Expected payments for remainder of fiscal year 1,000   1,000   1,000
Retirement benefits expense     43,000 43,000  
Defined contribution plan, expenses recognized     2,100 1,900  
Cash contributions by the employer to defined contribution plan     2,100 1,900  
Pension benefits          
Defined Benefit Plan          
Contributions made to defined benefit plans     53,000 36,000  
Contributions expected to be paid in current year 71,000   71,000   49,000
Service cost 18,341 $ 15,800 55,066 46,564  
Interest cost 20,660 21,150 60,987 63,216  
Expected return on plan assets (28,422) (27,991) (85,353) (83,988)  
Amortization of net prior period (gain)/cost 2 (10) 7 (32)  
Amortization of net actuarial (gains)/losses 8,944 3,989 25,059 11,667  
Net periodic pension/benefit cost (return) 19,525 12,938 55,766 37,427  
Impact of PUC D&Os 4,976 11,554 17,499 36,111  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 24,501 24,492 73,265 73,538  
Pension benefits | American Savings Bank (ASB)          
Defined Benefit Plan          
Contributions expected to be paid in current year 0   0   0
Pension benefits | Hawaiian Electric Industries, Inc.          
Defined Benefit Plan          
Contributions expected to be paid in current year 1,000   1,000   1,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined Benefit Plan          
Contributions made to defined benefit plans     52,000 36,000  
Contributions expected to be paid in current year 70,000   70,000   $ 48,000
Service cost 17,921 15,344 53,703 45,346  
Interest cost 19,183 19,560 56,613 58,388  
Expected return on plan assets (26,815) (26,146) (80,527) (78,474)  
Amortization of net prior period (gain)/cost 1 2 6 6  
Amortization of net actuarial (gains)/losses 8,188 3,841 22,925 10,993  
Net periodic pension/benefit cost (return) 18,478 12,601 52,720 36,259  
Impact of PUC D&Os 4,976 11,554 17,499 36,111  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 23,454 24,155 70,219 72,370  
Other benefits          
Defined Benefit Plan          
Service cost 641 573 1,903 1,656  
Interest cost 1,842 2,006 5,553 6,000  
Expected return on plan assets (3,023) (3,101) (9,100) (9,273)  
Amortization of net prior period (gain)/cost (474) (451) (1,355) (1,355)  
Amortization of net actuarial (gains)/losses 53 (3) 154 (10)  
Net periodic pension/benefit cost (return) (961) (976) (2,845) (2,982)  
Impact of PUC D&Os 835 821 2,389 2,443  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (126) (155) (456) (539)  
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined Benefit Plan          
Service cost 635 568 1,886 1,643  
Interest cost 1,764 1,920 5,327 5,755  
Expected return on plan assets (2,986) (3,064) (8,966) (9,135)  
Amortization of net prior period (gain)/cost (474) (451) (1,353) (1,353)  
Amortization of net actuarial (gains)/losses 53 0 155 0  
Net periodic pension/benefit cost (return) (1,008) (1,027) (2,951) (3,090)  
Impact of PUC D&Os 835 821 2,389 2,443  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ (173) $ (206) $ (562) $ (647)