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Credit agreement and long-term debt (Details) (USD $)
0 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2013
Hawaiian Electric Industries, Inc.
Jun. 30, 2013
Hawaiian Electric Industries, Inc.
Minimum
Jun. 30, 2013
Hawaiian Electric Industries, Inc.
Maximum
Jun. 30, 2013
Line of credit facility
item
Mar. 06, 2013
Series 2013A Senior note 3.99%, due 2023
Mar. 07, 2013
HEI medium-term note 5.25%, due 2013
Jun. 30, 2013
HEI medium-term note 5.25%, due 2013
Credit agreement                      
Revolving noncollateralized credit facility with a letter of credit sub-facility               $ 125,000,000      
Number of financial institutions               8      
Changes in long-term debt                      
Notes issued through private placement                 50,000,000    
Debt instrument, stated interest rate (as a percent)                 3.99%   5.25%
Consolidated net worth 1,624,649,000 1,593,865,000 1,575,776,000 1,528,706,000   975,000,000          
Capitalization ratio required to be maintained as per the debt covenant (as a percent)             50.00%        
Actual capitalization ratio (as a percent)         18.00%            
Refinancing of unsecured debt payable                   $ 50,000,000