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Shareholders' equity Details 2 (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Interest rate contracts (settled in 2011) $ 75,479 $ 78,151 $ 82,106
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost (23,280) (15,291) (9,364)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets 222,595 (75,471) (100,692)
Amount reclassified from AOCI
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications (199,818) 90,917 110,013
Amount reclassified from AOCI | Derivatives qualified as cash flow hedges Interest rate contracts (settled in 2011)
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Net realized gains on securities (738) (81) (224)
Interest rate contracts (settled in 2011) 235 236 181
Amount reclassified from AOCI | Retirement benefit plan items
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost 23,280 15,291 9,364
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets (222,595) 75,471 100,692
Hawaiian Electric Company, Inc. and Subsidiaries
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost (20,694) (13,673) (8,372)
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets 222,595 (75,471) (100,692)
Hawaiian Electric Company, Inc. and Subsidiaries | Amount reclassified from AOCI
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications (201,901) 89,144 109,064
Hawaiian Electric Company, Inc. and Subsidiaries | Amount reclassified from AOCI | Retirement benefit plan items
      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Line Items]      
Amortization of transition obligation, prior service credit and net losses recognized during the period in net periodic benefit cost 20,694 13,673 8,372
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets $ (222,595) $ 75,471 $ 100,692