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Retirement benefits - Components of NPPC and NPBC (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 78,173 $ 81,432 $ 73,387
Interest cost 80,062 75,361 81,335
Expected return on plan assets (141,266) (132,223) (113,800)
Amortization of net prior service (gain) cost 0 0 8
Amortization of net actuarial losses 27,412 27,245 33,456
Net periodic pension/benefit cost 44,381 51,815 74,386
Impact of PUC D&Os 37,148 27,963 20,997
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 81,529 79,778 95,383
Actual net return on plan assets (19.80%)    
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 75,845 79,463 71,604
Interest cost 74,363 70,235 75,484
Expected return on plan assets (133,873) (125,404) (107,369)
Amortization of net prior service (gain) cost 0 0 9
Amortization of net actuarial losses 26,358 27,534 30,566
Net periodic pension/benefit cost 42,693 51,828 70,294
Impact of PUC D&Os 37,148 27,963 20,997
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 79,841 79,791 91,291
Actual net return on plan assets (19.80%)    
Other benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 2,580 2,827 2,537
Interest cost 6,502 6,122 7,407
Expected return on plan assets (13,621) (12,957) (12,124)
Amortization of net prior service (gain) cost (928) (1,533) (1,761)
Amortization of net actuarial losses (12) 203 208
Net periodic pension/benefit cost (5,479) (5,338) (3,733)
Impact of PUC D&Os 4,966 4,839 3,179
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (513) (499) (554)
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 2,554 2,802 2,515
Interest cost 6,227 5,875 7,103
Expected return on plan assets (13,381) (12,755) (11,957)
Amortization of net prior service (gain) cost (925) (1,530) (1,758)
Amortization of net actuarial losses 0 206 207
Net periodic pension/benefit cost (5,525) (5,402) (3,890)
Impact of PUC D&Os 4,966 4,839 3,179
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ (559) $ (563) $ (711)