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Retirement benefits (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Defined benefit plans      
Expected payments for remainder of fiscal year $ 2,000,000    
Payments for benefits     $ 1,000,000
Retirement benefits expense $ 9,000,000 $ 9,000,000  
Number of years for which regulatory asset/liability for each utility will be amortized, beginning with respective utility's next rate case 5 years    
Defined contribution plan, expenses recognized $ 1,400,000 1,400,000  
Cash contributions by the employer to defined contribution plan 2,700,000 2,500,000  
Pension benefits      
Defined benefit plans      
Contributions made to defined benefit plans 16,000,000 21,000,000  
Service cost 15,391,000 16,466,000  
Interest cost 20,277,000 19,139,000  
Expected return on plan assets (24,664,000) (22,151,000)  
Amortization of net prior service loss (gain) (14,000) 1,000  
Amortization of net actuarial loss 5,969,000 8,962,000  
Net periodic benefit cost 16,959,000 22,417,000  
Impact of PUC D&Os (4,046,000) (9,513,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 12,913,000 12,904,000  
Other benefits      
Defined benefit plans      
Contributions expected to be paid in current year 65,000,000   88,000,000
Service cost 836,000 869,000  
Interest cost 2,474,000 2,235,000  
Expected return on plan assets (3,052,000) (2,907,000)  
Amortization of net prior service loss (gain) (448,000) (448,000)  
Amortization of net actuarial loss 287,000 430,000  
Net periodic benefit cost 97,000 179,000  
Impact of PUC D&Os 189,000 98,000  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 286,000 277,000  
Other benefits | American Savings Bank (ASB)      
Defined benefit plans      
Contributions expected to be paid in current year 0   0
Hawaiian Electric Company, Inc. and Subsidiaries      
Defined benefit plans      
Expected payments for remainder of fiscal year 1,000,000    
Payments for benefits     400,000
Retirement benefits expense 8,000,000 8,000,000  
Defined contribution plan, expenses recognized 400,000 400,000  
Cash contributions by the employer to defined contribution plan 400,000 400,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits      
Defined benefit plans      
Contributions made to defined benefit plans 16,000,000 21,000,000  
Service cost 14,933,000 15,983,000  
Interest cost 18,603,000 17,516,000  
Expected return on plan assets (22,932,000) (20,632,000)  
Amortization of net prior service loss (gain) 4,000 10,000  
Amortization of net actuarial loss 5,461,000 8,094,000  
Net periodic benefit cost 16,069,000 20,971,000  
Impact of PUC D&Os (4,046,000) (9,513,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 12,023,000 11,458,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits      
Defined benefit plans      
Contributions expected to be paid in current year 64,000,000   86,000,000
Service cost 822,000 855,000  
Interest cost 2,389,000 2,159,000  
Expected return on plan assets (3,003,000) (2,859,000)  
Amortization of net prior service loss (gain) (451,000) (451,000)  
Amortization of net actuarial loss 284,000 422,000  
Net periodic benefit cost 41,000 126,000  
Impact of PUC D&Os 189,000 98,000  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 230,000 $ 224,000  
Hawaiian Electric Industries, Inc. | Other benefits      
Defined benefit plans      
Contributions expected to be paid in current year $ 1,000,000   $ 2,000,000