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Retirement benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Defined Benefit Plan          
Contributions made to defined benefit plans     $ 32,000 $ 39,000  
Contributions expected to be paid in current year $ 43,000   43,000   $ 52,000
Expected payments for remainder of fiscal year 3,000   3,000   1,000
Retirement benefits expense     $ 35,000 35,000  
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     $ 6,500 4,900  
Cash contributions by the employer to defined contribution plan     $ 5,400 4,800  
Employer contribution, percent of employee annual compensation     10.00%    
Pension benefits          
Defined Benefit Plan          
Service cost 18,831 $ 20,102 $ 58,478 61,031  
Interest cost 20,274 18,896 59,895 56,497  
Expected return on plan assets (35,163) (33,022) (105,827) (99,157)  
Amortization of net prior period gain 0 0 0 0  
Amortization of net actuarial (gain) losses 7,782 10,112 20,376 20,099  
Net periodic pension/benefit cost (return) 11,724 16,088 32,922 38,470  
Impact of PUC D&Os 8,758 4,292 27,861 20,972  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 20,482 20,380 60,783 59,442  
Other benefits          
Defined Benefit Plan          
Service cost 624 711 1,937 2,121  
Interest cost 1,593 1,459 4,868 4,597  
Expected return on plan assets (3,394) (3,252) (10,189) (9,717)  
Amortization of net prior period gain (232) (383) (696) (1,150)  
Amortization of net actuarial (gain) losses (3) (140) (9) 158  
Net periodic pension/benefit cost (return) (1,412) (1,605) (4,089) (3,991)  
Impact of PUC D&Os 1,289 1,483 3,725 3,629  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (123) (122) (364) (362)  
Hawaiian Electric Company, Inc. and Subsidiaries          
Defined Benefit Plan          
Contributions made to defined benefit plans     31,000 38,000  
Contributions expected to be paid in current year 42,000   42,000   51,000
Expected payments for remainder of fiscal year 1,000   1,000   $ 1,000
Retirement benefits expense     34,000 35,000  
Defined contribution plan, expenses recognized     2,900 2,300  
Cash contributions by the employer to defined contribution plan     2,900 2,300  
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits          
Defined Benefit Plan          
Service cost 18,248 19,610 56,883 59,597  
Interest cost 18,850 17,614 55,773 52,676  
Expected return on plan assets (33,314) (31,318) (100,405) (94,053)  
Amortization of net prior period gain 0 0 0 0  
Amortization of net actuarial (gain) losses 7,519 9,880 19,769 20,651  
Net periodic pension/benefit cost (return) 11,303 15,786 32,020 38,871  
Impact of PUC D&Os 8,758 4,292 27,861 20,972  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 20,061 20,078 59,881 59,843  
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits          
Defined Benefit Plan          
Service cost 617 704 1,915 2,101  
Interest cost 1,525 1,398 4,670 4,406  
Expected return on plan assets (3,343) (3,202) (10,035) (9,566)  
Amortization of net prior period gain (232) (383) (694) (1,148)  
Amortization of net actuarial (gain) losses 0 (138) 0 155  
Net periodic pension/benefit cost (return) (1,433) (1,621) (4,144) (4,052)  
Impact of PUC D&Os 1,289 1,483 3,725 3,629  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ (144) $ (138) $ (419) $ (423)