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Electric utility segment - Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Regulatory assets    
Regulatory assets $ 833,426 $ 869,297
Regulatory liabilities    
Regulatory liabilities $ 950,236 880,770
Minimum | Income taxes    
Regulatory liabilities    
Authorized amortization or recovery periods 1 year  
Maximum | Income taxes    
Regulatory liabilities    
Authorized amortization or recovery periods 55 years  
Hawaiian Electric Company, Inc. and Subsidiaries    
Regulatory assets    
Regulatory assets $ 833,426 869,297
Regulatory liabilities    
Regulatory liabilities 950,236 880,770
Hawaiian Electric Company, Inc. and Subsidiaries | Cost of removal in excess of salvage value    
Regulatory liabilities    
Regulatory liabilities 491,006 453,986
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes    
Regulatory liabilities    
Regulatory liabilities 413,339 406,324
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory liabilities    
Regulatory liabilities    
Regulatory liabilities $ 9,546 9,961
Authorized amortization or recovery periods 5 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory liabilities    
Regulatory liabilities    
Regulatory liabilities $ 36,345 10,499
Authorized amortization or recovery periods 5 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Cost of removal in excess of salvage value    
Regulatory liabilities    
Authorized amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum | Other, regulatory liabilities    
Regulatory liabilities    
Remaining amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Cost of removal in excess of salvage value    
Regulatory liabilities    
Authorized amortization or recovery periods 60 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum | Other, regulatory liabilities    
Regulatory liabilities    
Remaining amortization or recovery periods 2 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Current assets    
Regulatory assets    
Regulatory assets $ 71,016 88,390
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term assets    
Regulatory assets    
Regulatory assets 762,410 780,907
Hawaiian Electric Company, Inc. and Subsidiaries | Current liabilities    
Regulatory liabilities    
Regulatory liabilities 17,977 3,401
Hawaiian Electric Company, Inc. and Subsidiaries | Long-term liabilities    
Regulatory liabilities    
Regulatory liabilities 932,259 877,369
Hawaiian Electric Company, Inc. and Subsidiaries | Retirement benefit plans, regulatory assets    
Regulatory assets    
Regulatory assets 624,126 637,204
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes    
Regulatory assets    
Regulatory assets $ 114,076 118,201
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Minimum    
Regulatory assets    
Authorized amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Income taxes | Maximum    
Regulatory assets    
Authorized amortization or recovery periods 55 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account    
Regulatory assets    
Regulatory assets $ 49,560 64,087
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account | Minimum    
Regulatory assets    
Authorized amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Decoupling revenue balancing account | Maximum    
Regulatory assets    
Authorized amortization or recovery periods 2 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances    
Regulatory assets    
Regulatory assets $ 10,065 11,993
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Minimum    
Regulatory assets    
Authorized amortization or recovery periods 19 years  
Remaining amortization or recovery periods 6 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Unamortized expense and premiums on retired debt and equity issuances | Maximum    
Regulatory assets    
Authorized amortization or recovery periods 30 years  
Remaining amortization or recovery periods 18 years  
Hawaiian Electric Company, Inc. and Subsidiaries | Vacation earned, but not yet taken    
Regulatory assets    
Regulatory assets $ 10,820 11,224
Authorized amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets    
Regulatory assets    
Regulatory assets $ 24,779 $ 26,588
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets | Minimum    
Regulatory assets    
Authorized amortization or recovery periods 1 year  
Remaining amortization or recovery periods 1 year  
Hawaiian Electric Company, Inc. and Subsidiaries | Other, regulatory assets | Maximum    
Regulatory assets    
Authorized amortization or recovery periods 50 years  
Remaining amortization or recovery periods 46 years