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Retirement benefits - Components of NPBC (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension benefits      
Defined benefit plans      
Service cost $ 68,987 $ 64,906 $ 60,555
Interest cost 77,374 81,185 81,549
Expected return on plan assets (108,953) (102,745) (98,559)
Amortization of net prior service (gain) cost (42) (55) (57)
Amortization of net actuarial losses 30,084 26,496 24,832
Net periodic pension/benefit cost 67,450 69,787 68,320
Impact of PUC D&Os 25,828 (18,004) (18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 93,278 51,783 50,203
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015      
Prior service credit 0    
Net actuarial loss 15,400    
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined benefit plans      
Service cost 67,359 63,059 58,796
Interest cost 71,294 74,632 74,808
Expected return on plan assets (102,368) (95,892) (91,633)
Amortization of net prior service (gain) cost 8 8 13
Amortization of net actuarial losses 27,302 24,392 22,693
Net periodic pension/benefit cost 63,595 66,199 64,677
Impact of PUC D&Os 25,828 (18,004) (18,117)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 89,423 48,195 46,560
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015      
Prior service credit 0    
Net actuarial loss 14,300    
Other benefits      
Defined benefit plans      
Service cost 2,721 3,374 3,331
Interest cost 7,933 9,453 9,670
Expected return on plan assets (12,908) (12,326) (12,273)
Amortization of net prior service (gain) cost (1,805) (1,793) (1,793)
Amortization of net actuarial losses 95 1,130 804
Net periodic pension/benefit cost (3,964) (162) (261)
Impact of PUC D&Os 3,842 1,211 1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (122) 1,049 1,082
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015      
Prior service credit (1,800)    
Net actuarial loss 0    
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries      
Defined benefit plans      
Service cost 2,704 3,353 3,284
Interest cost 7,628 9,115 9,337
Expected return on plan assets (12,713) (12,147) (12,096)
Amortization of net prior service (gain) cost (1,803) (1,804) (1,803)
Amortization of net actuarial losses 98 1,102 793
Net periodic pension/benefit cost (4,086) (381) (485)
Impact of PUC D&Os 3,842 1,211 1,343
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) (244) $ 830 $ 858
Amounts amortized from AOCI or regulatory assets into net periodic pension benefit cost during 2015      
Prior service credit (1,800)    
Net actuarial loss $ 0