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Retirement benefits (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Defined benefit plans          
Expected payments for remainder of fiscal year $ 2,000,000   $ 2,000,000   $ 1,000,000
Retirement benefits expense     $ 27,000,000 $ 17,000,000  
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     $ 3,200,000 3,300,000  
Cash contributions by the employer to defined contribution plan     4,800,000 4,000,000  
Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Expected payments for remainder of fiscal year 1,000,000   1,000,000   500,000
Retirement benefits expense     25,000,000 15,000,000  
Defined contribution plan, expenses recognized     1,100,000 1,000,000  
Cash contributions by the employer to defined contribution plan     1,100,000 1,000,000  
Pension benefits          
Defined benefit plans          
Contributions made to defined benefit plans     32,000,000 33,000,000  
Contributions expected to be paid in current year 42,000,000   42,000,000   67,000,000
Service cost 17,428,000 $ 15,870,000 34,541,000 32,364,000  
Interest cost 19,459,000 20,361,000 38,693,000 40,577,000  
Expected return on plan assets (27,224,000) (25,646,000) (54,478,000) (51,367,000)  
Amortization of net prior service gain (11,000) (13,000) (21,000) (27,000)  
Amortization of net actuarial loss 7,634,000 6,707,000 15,029,000 13,220,000  
Net periodic pension/benefit cost (return) 17,286,000 17,279,000 33,764,000 34,767,000  
Impact of PUC D&Os 7,179,000 (4,867,000) 9,836,000 (10,023,000)  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 24,465,000 12,412,000 43,600,000 24,744,000  
Pension benefits | American Savings Bank (ASB)          
Defined benefit plans          
Contributions expected to be paid in current year 0   0   0
Pension benefits | Hawaiian Electric Industries, Inc.          
Defined benefit plans          
Contributions expected to be paid in current year 1,000,000   1,000,000   1,000,000
Pension benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Contributions made to defined benefit plans     32,000,000 33,000,000  
Contributions expected to be paid in current year 41,000,000   41,000,000   $ 66,000,000
Service cost 17,007,000 15,436,000 33,680,000 31,530,000  
Interest cost 17,937,000 18,726,000 35,647,000 37,315,000  
Expected return on plan assets (25,577,000) (23,935,000) (51,184,000) (47,946,000)  
Amortization of net prior service gain 2,000 2,000 4,000 4,000  
Amortization of net actuarial loss 6,941,000 6,190,000 13,651,000 12,196,000  
Net periodic pension/benefit cost (return) 16,310,000 16,419,000 31,798,000 33,099,000  
Impact of PUC D&Os 7,179,000 (4,867,000) 9,836,000 (10,023,000)  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 23,489,000 11,552,000 41,634,000 23,076,000  
Other benefits          
Defined benefit plans          
Service cost 692,000 847,000 1,361,000 1,687,000  
Interest cost 2,030,000 2,315,000 3,961,000 4,726,000  
Expected return on plan assets (3,267,000) (3,104,000) (6,459,000) (6,170,000)  
Amortization of net prior service gain (451,000) (448,000) (903,000) (897,000)  
Amortization of net actuarial loss 48,000 199,000 46,000 565,000  
Net periodic pension/benefit cost (return) (948,000) (191,000) (1,994,000) (89,000)  
Impact of PUC D&Os 1,024,000 527,000 2,095,000 673,000  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) 76,000 336,000 101,000 584,000  
Other benefits | Hawaiian Electric Company, Inc. and Subsidiaries          
Defined benefit plans          
Service cost 688,000 841,000 1,352,000 1,676,000  
Interest cost 1,955,000 2,231,000 3,814,000 4,558,000  
Expected return on plan assets (3,216,000) (3,056,000) (6,356,000) (6,073,000)  
Amortization of net prior service gain (451,000) (451,000) (902,000) (902,000)  
Amortization of net actuarial loss 49,000 192,000 49,000 551,000  
Net periodic pension/benefit cost (return) (975,000) (243,000) (2,043,000) (190,000)  
Impact of PUC D&Os 1,024,000 527,000 2,095,000 673,000  
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) $ 49,000 $ 284,000 $ 52,000 $ 483,000