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Retirement benefits (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Defined benefit plans          
Expected payments for remainder of fiscal year $ 3,000,000   $ 3,000,000    
Payments for benefits         $ 1,000,000
Retirement benefits expense     $ 26,000,000 $ 27,000,000  
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     $ 4,100,000 4,000,000  
Cash contributions by the employer to defined contribution plan     4,600,000 4,300,000  
Pension benefits          
Defined benefit plans          
Contributions made to defined benefit plans     49,000,000 66,000,000  
Contributions expected to be paid in current year     65,000,000   88,000,000
Service cost 15,126,000 $ 16,577,000 45,430,000 49,683,000  
Interest cost 20,396,000 19,229,000 61,154,000 57,731,000  
Expected return on plan assets (24,640,000) (22,126,000) (73,920,000) (66,426,000)  
Amortization of net prior service loss (gain) (15,000) 1,000 (43,000) 3,000  
Amortization of net actuarial loss 6,228,000 9,191,000 18,605,000 27,608,000  
Net periodic benefit cost 17,095,000 22,872,000 51,226,000 68,599,000  
Impact of PUC D&Os (4,653,000) (10,017,000) (13,464,000) (29,994,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 12,442,000 12,855,000 37,762,000 38,605,000  
Pension benefits | American Savings Bank (ASB)          
Defined benefit plans          
Contributions expected to be paid in current year     0   0
Other benefits          
Defined benefit plans          
Service cost 831,000 982,000 2,499,000 2,945,000  
Interest cost 2,417,000 2,254,000 7,254,000 6,757,000  
Expected return on plan assets (3,064,000) (2,912,000) (9,207,000) (8,753,000)  
Amortization of net prior service loss (gain) (449,000) (448,000) (1,345,000) (1,345,000)  
Amortization of net actuarial loss 200,000 450,000 603,000 1,346,000  
Net periodic benefit cost (65,000) 326,000 (196,000) 950,000  
Impact of PUC D&Os 336,000 (60,000) 1,008,000 (180,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 271,000 266,000 812,000 770,000  
Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Expected payments for remainder of fiscal year 1,000,000   1,000,000    
Payments for benefits         400,000
Retirement benefits expense     23,000,000 22,000,000  
Defined contribution plan, expenses recognized     1,200,000 1,100,000  
Cash contributions by the employer to defined contribution plan     1,200,000 1,100,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Pension benefits          
Defined benefit plans          
Contributions made to defined benefit plans     48,000,000 65,000,000  
Contributions expected to be paid in current year     64,000,000   86,000,000
Service cost 14,699,000 16,066,000 44,097,000 48,197,000  
Interest cost 18,702,000 17,632,000 56,106,000 52,897,000  
Expected return on plan assets (22,908,000) (20,635,000) (68,725,000) (61,906,000)  
Amortization of net prior service loss (gain) 3,000 10,000 10,000 30,000  
Amortization of net actuarial loss 5,674,000 8,342,000 17,020,000 25,028,000  
Net periodic benefit cost 16,170,000 21,415,000 48,508,000 64,246,000  
Impact of PUC D&Os (4,653,000) (10,017,000) (13,464,000) (29,994,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 11,517,000 11,398,000 35,044,000 34,252,000  
Hawaiian Electric Company, Inc. and Subsidiaries | Other benefits          
Defined benefit plans          
Service cost 821,000 967,000 2,463,000 2,902,000  
Interest cost 2,334,000 2,175,000 7,003,000 6,525,000  
Expected return on plan assets (3,023,000) (2,873,000) (9,072,000) (8,621,000)  
Amortization of net prior service loss (gain) (451,000) (450,000) (1,353,000) (1,352,000)  
Amortization of net actuarial loss 198,000 438,000 595,000 1,315,000  
Net periodic benefit cost (121,000) 257,000 (364,000) 769,000  
Impact of PUC D&Os 336,000 (60,000) 1,008,000 (180,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) $ 215,000 $ 197,000 644,000 $ 589,000  
Hawaiian Electric Industries, Inc. | Pension benefits          
Defined benefit plans          
Contributions expected to be paid in current year     $ 1,000,000   $ 2,000,000