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Quarterly information (unaudited) (Details) (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
Condensed Financial Statements, Captions [Line Items]                      
Revenues $ 826,447,000 $ 831,229,000 $ 796,730,000 $ 784,064,000 $ 838,147,000 $ 867,720,000 $ 854,268,000 $ 814,860,000 $ 3,238,470,000 $ 3,374,995,000 $ 3,242,335,000
Operating income 72,293,000 90,099,000 82,370,000 70,657,000 37,272,000 91,702,000 79,406,000 75,816,000 315,419,000 284,196,000 289,696,000
Net income 39,486,000 48,707,000 41,061,000 34,152,000 14,309,000 48,177,000 39,273,000 38,789,000 163,406,000 140,548,000 140,120,000
Net income for common stock 39,013,000 48,236,000 40,588,000 33,679,000 13,836,000 47,706,000 38,800,000 38,316,000 161,516,000 138,658,000 138,230,000
Basic earnings per common share (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 earnings per common share (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
Dividends per common share (in dollars per share) $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 1.24 $ 1.24 $ 1.24
Market price per common share                      
High end of range (in dollars per share) $ 27.15 $ 27.24 $ 28.30 $ 27.92 $ 26.75 $ 29.24 $ 28.87 $ 26.79 $ 28.30 $ 29.24  
Low end of range (in dollars per share) $ 24.51 $ 24.12 $ 23.84 $ 25.50 $ 23.65 $ 26.26 $ 24.65 $ 24.86 $ 23.84 $ 23.65  
Hawaiian Electric Company, Inc. and Subsidiaries
                      
Condensed Financial Statements, Captions [Line Items]                      
Revenues 764,096,000 766,115,000 730,688,000 719,273,000 769,182,000 801,095,000 789,552,000 749,610,000 2,980,172,000 3,109,439,000 2,978,690,000
Operating income 59,508,000 71,914,000 61,138,000 52,953,000 19,443,000 74,819,000 61,496,000 57,254,000 245,513,000 213,012,000 215,134,000
Net income 32,489,000 38,315,000 29,192,000 24,928,000 4,724,000 38,873,000 29,875,000 27,799,000 124,924,000 101,271,000 101,981,000
Net income for common stock 31,990,000 37,817,000 28,693,000 24,429,000 4,225,000 38,375,000 29,376,000 27,300,000 122,929,000 99,276,000 99,986,000
Market price per common share                      
Amount of CIS project costs written down by electric utilities         $ 24,000,000