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Basis of presentation (Details) - HECO (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheet      
Total assets $ 9,821,957 $ 9,594,477  
Retained earnings 215,626 198,397 178,667
Total capitalization and liabilities 9,821,957 9,594,477  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings 215,626 198,397 178,667
Hawaiian Electric Company, Inc. and Subsidiaries
      
Consolidated Balance Sheet      
Prepayments and other 43,401 36,667  
Total current assets 710,726 650,269  
Total assets 4,857,550 4,674,007  
Retained earnings 901,195 881,041 851,613
Common stock equity 1,423,148 1,402,841 1,334,155
Total capitalization 2,605,094 2,437,704  
Taxes accrued 217,321 230,076  
Total current liabilities 542,508 564,992  
Total capitalization and liabilities 4,857,550 4,674,007  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings 901,195 881,041 851,613
Common stock equity 1,423,148 1,402,841 1,334,155
As previously filed
      
Consolidated Balance Sheet      
Total assets   9,592,731  
Retained earnings   201,640 181,910
Total capitalization and liabilities   9,592,731  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings   201,640 181,910
As previously filed | Hawaiian Electric Company, Inc. and Subsidiaries
      
Consolidated Balance Sheet      
Prepayments and other   34,602  
Total current assets   648,204  
Total assets   4,671,942  
Retained earnings   884,284 854,856
Common stock equity   1,406,084 1,337,398
Total capitalization   2,440,947  
Taxes accrued   224,768  
Total current liabilities   559,684  
Total capitalization and liabilities   4,671,942  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings   884,284 854,856
Common stock equity   1,406,084 1,337,398
Difference
      
Consolidated Balance Sheet      
Total assets   1,746  
Retained earnings   (3,243) (3,243)
Total capitalization and liabilities   1,746  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings   (3,243) (3,243)
Difference | Hawaiian Electric Company, Inc. and Subsidiaries
      
Consolidated Balance Sheet      
Prepayments and other   2,065  
Total current assets   2,065  
Total assets   2,065  
Retained earnings   (3,243) (3,243)
Common stock equity   (3,243) (3,243)
Total capitalization   (3,243)  
Taxes accrued   5,308  
Total current liabilities   5,308  
Total capitalization and liabilities   2,065  
Consolidated Statement of Changes in Common Stock Equity      
Retained earnings   (3,243) (3,243)
Common stock equity   $ (3,243) $ (3,243)