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Summary of significant accounting policies (Details 3) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic                      
Distributed earnings (in dollars per share)                 $ 1.24 $ 1.24 $ 1.24
Undistributed earnings (loss) (in dollars per share)                 $ 0.39 $ 0.19 $ 0.21
Earnings Per Share, basic (in dollars per share) $ 0.39 $ 0.49 $ 0.41 $ 0.34 $ 0.14 $ 0.49 $ 0.40 $ 0.40 $ 1.63 $ 1.43 $ 1.45
Diluted                      
Distributed earnings (in dollars per share)                 $ 1.24 $ 1.24 $ 1.24
Undistributed earnings (losses) (in dollars per share)                 $ 0.38 $ 0.18 $ 0.20
Earnings Per Share, diluted (in dollars per share) $ 0.39 $ 0.48 $ 0.41 $ 0.34 $ 0.14 $ 0.49 $ 0.40 $ 0.40 $ 1.62 $ 1.42 $ 1.44
Accounts Receivable                      
Allowance for customer accounts receivable, accrued unbilled revenues and other accounts receivable $ 2,000,000       $ 2,000,000       $ 2,000,000 $ 2,000,000  
Goodwill and other intangibles                      
Goodwill 82,190,000       82,190,000       82,190,000 82,190,000  
Estimated fair value in excess of book value (as a percent)   60.00%                  
Goodwill, Impairment Loss                 0 0 0
Hawaiian Electric Company, Inc. and Subsidiaries
                     
Electric utility revenues                      
Revenue taxes included in "operating revenues" and in "taxes, other than income taxes" expense                 266,000,000 280,000,000 264,000,000
Weighted average AFUDC rate (as a percent)                 7.60% 7.60% 8.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Minimum
                     
Contributions in aid of construction                      
Contributions amortized period                 30 years    
Hawaiian Electric Company, Inc. and Subsidiaries | Maximum
                     
Contributions in aid of construction                      
Contributions amortized period                 55 years    
Bank
                     
Allowance for loan losses                      
Past due period after which the accrual of interest on loans ceases                 90 days    
Loans modified in a troubled debt restructuring                      
Number of consecutive months of repayment required for loans to be removed from nonaccrual status                 6 months    
Goodwill and other intangibles                      
Goodwill 82,190,000       82,190,000       82,190,000 82,190,000  
Bank | Minimum
                     
Allowance for loan losses                      
Past due unsecured consumer loans, period to reach delinquency status                 120 days    
Bank | Maximum
                     
Allowance for loan losses                      
Past due unsecured consumer loans, period to reach delinquency status                 180 days    
Stock appreciation rights (SARs) | Common stock
                     
Antidilutive effect of stock appreciation rights (SARs)                      
Antidilutive effects of SARs shares that were not included in the computation of diluted EPS (in shares)                 102,000 102,000,000 0
Market Approach Valuation Technique [Member]
                     
Goodwill and other intangibles                      
Control premium                 18.30%    
Number of acquisitions used in valuation                 18    
Period used in control premium                 2 years    
Fair Value Inputs, Control Premium, Observation Events, Percentage of Voting Interests Acquired                 100.00%    
Market Approach Valuation Technique [Member] | Minimum
                     
Goodwill and other intangibles                      
Asset value of financial institutions used in comparability 3,500,000,000               3,500,000,000    
Market Approach Valuation Technique [Member] | Maximum
                     
Goodwill and other intangibles                      
Asset value of financial institutions used in comparability $ 8,000,000,000               $ 8,000,000,000    
Discounted cash flow
                     
Goodwill and other intangibles                      
Discount rate (as a percent)                 8.50%