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Electric utility segment (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 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
May 31, 2013
HECO
Dec. 31, 2013
HECO
Dec. 31, 2012
HECO
Dec. 31, 2011
HECO
Dec. 31, 2013
HELCO
Dec. 31, 2012
HELCO
Dec. 31, 2011
HELCO
Dec. 31, 2013
MECO
Dec. 31, 2012
MECO
Dec. 31, 2011
MECO
Dec. 31, 2013
RHI
Dec. 31, 2012
RHI
Dec. 31, 2011
RHI
Dec. 31, 2013
Consolidating adjustments
Dec. 31, 2012
Consolidating adjustments
Dec. 31, 2011
Consolidating adjustments
Dec. 31, 2013
HECO Consolidated
Sep. 30, 2013
HECO Consolidated
Jun. 30, 2013
HECO Consolidated
Mar. 31, 2013
HECO Consolidated
Dec. 31, 2012
HECO Consolidated
Sep. 30, 2012
HECO Consolidated
Jun. 30, 2012
HECO Consolidated
Mar. 31, 2012
HECO Consolidated
Dec. 31, 2013
HECO Consolidated
Dec. 31, 2012
HECO Consolidated
Dec. 31, 2011
HECO Consolidated
Revenues                       $ 5,300 $ 2,124,174 $ 2,228,233 $ 2,114,066 $ 431,517 $ 441,013 $ 444,891 $ 424,603 $ 440,270 $ 419,760 $ 0     $ (122) $ (77) $ (27)                 $ 2,980,172 $ 3,109,439 $ 2,978,690
Fuel oil                         851,365 945,246 909,172 125,516 116,866 121,839 208,671 235,307 234,115                             1,185,552 1,297,419 1,265,126
Purchased power                         527,839 540,802 522,503 128,368 145,386 137,453 54,474 38,052 29,696                             710,681 724,240 689,652
Other operation and maintenance                         283,768 266,208 266,807 61,418 60,447 56,066 58,081 70,771 57,202 3 3 9                       403,270 397,429 380,084
Depreciation                         99,738 90,783 89,324 34,188 33,337 32,767 20,099 20,378 20,884                             154,025 144,498 142,975
Taxes, other than income taxes                         200,962 209,943 196,170 40,092 41,370 41,028 40,077 41,528 39,306                             281,131 292,841 276,504
Impairment of utility assets                           29,000 9,215   5,500 0   5,500 0                             0 40,000 9,215
Total expenses                 2,923,051 3,090,799 2,952,639   1,963,672 2,081,982 1,993,191 389,582 402,906 389,153 381,402 411,536 381,203 3 3 9                       2,734,659 2,896,427 2,763,556
Total operating income 72,293 90,099 82,370 70,657 37,272 91,702 79,406 75,816 315,419 284,196 289,696   160,502 146,251 120,875 41,935 38,107 55,738 43,201 28,734 38,557 (3) (3) (9) (122) (77) (27) 59,508 71,914 61,138 52,953 19,443 74,819 61,496 57,254 245,513 213,012 215,134
Allowance for equity funds used during construction                 5,561 7,007 5,964   4,495 5,735 4,572 643 585 592 423 687 800                             5,561 7,007 5,964
Equity in earnings of subsidiaries                         41,410 28,836 44,616                   (41,410) (28,836) (44,616)                      
Interest expense and other charges, net                         (39,107) (40,842) (37,624) (11,341) (12,066) (12,554) (8,953) (9,224) (9,880)       122 77 27                 (59,279) (62,055) (60,031)
Allowance for borrowed funds used during construction                 2,246 4,355 2,498   1,814 3,642 1,941 263 235 248 169 478 309                             2,246 4,355 2,498
Income before income taxes                 247,747 217,407 216,052   169,114 143,622 134,380 31,500 26,861 44,024 34,840 20,675 29,786 (3) (3) (9) (41,410) (28,836) (44,616)                 194,041 162,319 163,565
Income taxes                 84,341 76,859 75,932   45,105 43,266 33,314 10,830 10,115 16,839 13,182 7,667 11,431 0     0                     69,117 61,048 61,584
Net income 39,486 48,707 41,061 34,152 14,309 48,177 39,273 38,789 163,406 140,548 140,120   124,009 100,356 101,066 20,670 16,746 27,185 21,658 13,008 18,355 (3) (3) (9) (41,410) (28,836) (44,616) 32,489 38,315 29,192 24,928 4,724 38,873 29,875 27,799 124,924 101,271 101,981
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890         534 534 534 381 381 381                             915 915 915
Net income (loss) attributable to Hawaiian Electric                         124,009 100,356 101,066 20,136 16,212 26,651 21,277 12,627 17,974 (3) (3) (9) (41,410) (28,836) (44,616)                 124,009 100,356 101,066
Preferred stock dividends of Hawaiian Electric                         1,080 1,080 1,080                                         1,080 1,080 1,080
Net income for common stock $ 39,013 $ 48,236 $ 40,588 $ 33,679 $ 13,836 $ 47,706 $ 38,800 $ 38,316 $ 161,516 $ 138,658 $ 138,230   $ 122,929 $ 99,276 $ 99,986 $ 20,136 $ 16,212 $ 26,651 $ 21,277 $ 12,627 $ 17,974 $ (3) $ (3) $ (9) $ (41,410) $ (28,836) $ (44,616) $ 31,990 $ 37,817 $ 28,693 $ 24,429 $ 4,225 $ 38,375 $ 29,376 $ 27,300 $ 122,929 $ 99,276 $ 99,986