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Retirement benefits (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Defined benefit plans      
Expected payments in 2014 $ 2,000,000    
Payments for benefits     2,000,000
Retirement benefits expense 8,000,000 10,000,000  
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 1,100,000 1,000,000  
Cash contributions by the employer to defined contribution plan 2,800,000 2,400,000  
Pension benefits
      
Defined benefit plans      
Contributions made to defined benefit plans 15,000,000 21,000,000  
Service cost 12,127,000 14,089,000  
Interest cost 18,001,000 16,106,000  
Expected return on plan assets (20,347,000) (18,085,000)  
Amortization of prior service gain 22,000 (24,000)  
Amortization of net actuarial loss 5,038,000 9,819,000  
Net periodic benefit cost 14,841,000 21,905,000  
Impact of PUC D&Os (3,011,000) (8,866,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 11,830,000 13,039,000  
Other benefits
      
Defined benefit plans      
Defined Benefit Plan, Expected Contributions in Current Fiscal Year 59,000,000 83,000,000  
Service cost 883,000 1,049,000  
Interest cost 2,160,000 1,931,000  
Expected return on plan assets (2,708,000) (2,562,000)  
Amortization of prior service gain (448,000) (448,000)  
Amortization of net actuarial loss (3,000) 521,000  
Net periodic benefit cost (116,000) 491,000  
Impact of PUC D&Os 445,000 (397,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 329,000 94,000  
American Savings Bank (ASB) | Other benefits
      
Defined benefit plans      
Defined Benefit Plan, Expected Contributions in Current Fiscal Year   0  
Hawaiian Electric Industries, Inc. | Other benefits
      
Defined benefit plans      
Defined Benefit Plan, Expected Contributions in Current Fiscal Year 1,000,000 2,000,000  
Electric utility
      
Defined benefit plans      
Expected payments in 2014 1,000,000    
Payments for benefits     1,000,000
Retirement benefits expense 8,000,000 9,000,000  
Defined contribution plan, expenses recognized 200,000 200,000  
Cash contributions by the employer to defined contribution plan 200,000 200,000  
Electric utility | Pension benefits
      
Defined benefit plans      
Contributions made to defined benefit plans 14,000,000 21,000,000  
Service cost 11,697,000 13,603,000  
Interest cost 16,436,000 14,676,000  
Expected return on plan assets (18,171,000) (16,090,000)  
Amortization of prior service gain 15,000 (116,000)  
Amortization of net actuarial loss 4,560,000 8,790,000  
Net periodic benefit cost 14,537,000 20,863,000  
Impact of PUC D&Os (3,011,000) (8,866,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) 11,526,000 11,997,000  
Electric utility | Other benefits
      
Defined benefit plans      
Defined Benefit Plan, Expected Contributions in Current Fiscal Year 58,000,000 81,000,000  
Service cost 856,000 1,014,000  
Interest cost 2,079,000 1,861,000  
Expected return on plan assets (2,663,000) (2,520,000)  
Amortization of prior service gain (451,000) (451,000)  
Amortization of net actuarial loss 0 504,000  
Net periodic benefit cost (179,000) 408,000  
Impact of PUC D&Os 445,000 (397,000)  
Net periodic benefit cost (adjusted for impact of PUC D&Os) $ 266,000 $ 11,000