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Electric utility segment - Consolidating Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues                 $ 2,614,831   $ 2,380,654
Expenses                      
Purchased power                 639,000 $ 587,000 563,000
Total expenses                 2,527,493 2,209,392 2,024,816
Operating income $ 84,604 $ 98,064 $ 78,799 $ 71,889 $ 87,220 $ 111,473 $ 77,802 $ 69,738 333,356 346,233 355,838
Allowance for equity funds used during construction                 10,877 12,483 8,325
Retirement defined benefits expense—other than service costs                 (5,962) (7,942) (7,663)
Allowance for borrowed funds used during construction                 4,867 4,778 3,144
Income before income taxes                 254,461 276,580 373,841
Income taxes                 50,797 109,393 123,695
Net income (loss) 50,046 66,371 46,527 40,720 32,843 60,544 39,134 34,666 203,664 167,187 250,146
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890
Net income for common stock 49,573 65,900 46,054 40,247 32,370 60,073 38,661 34,193 201,774 165,297 248,256
Hawaiian Electric                      
Revenues                 1,802,550 1,598,504 1,474,384
Expenses                      
Fuel oil                 523,706 408,204 305,359
Purchased power                 494,450 454,189 431,009
Other operation and maintenance                 313,346 274,391 268,118
Depreciation                 137,410 130,889 126,086
Taxes, other than income taxes                 170,363 152,933 141,615
Total expenses                 1,639,275 1,420,606 1,272,187
Operating income                 163,275 177,898 202,197
Allowance for equity funds used during construction                 9,208 10,896 6,659
Equity in earnings of subsidiaries                 45,393 38,057 42,391
Retirement defined benefits expense—other than service costs                 (2,649) (5,049) (5,058)
Interest expense and other charges, net                 (52,180) (48,277) (45,839)
Allowance for borrowed funds used during construction                 4,019 4,089 2,484
Income before income taxes                 167,066 177,614 202,834
Income taxes                 22,333 56,583 59,437
Net income (loss)                 144,733 121,031 143,397
Preferred stock dividends of subsidiaries                 0 0 0
Net income attributable to Hawaiian Electric                 144,733 121,031 143,397
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock                 143,653 119,951 142,317
Hawaii Electric Light Company, Inc. (HELCO)                      
Revenues                 375,493 333,467 311,385
Expenses                      
Fuel oil                 90,792 63,894 55,094
Purchased power                 95,838 87,772 81,018
Other operation and maintenance                 70,396 66,184 64,216
Depreciation                 40,235 38,741 37,797
Taxes, other than income taxes                 34,850 31,184 29,017
Total expenses                 332,111 287,775 267,142
Operating income                 43,382 45,692 44,243
Allowance for equity funds used during construction                 478 554 765
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 (417) (93) 319
Interest expense and other charges, net                 (11,836) (11,799) (11,555)
Allowance for borrowed funds used during construction                 276 238 294
Income before income taxes                 31,883 34,592 34,066
Income taxes                 6,868 13,912 12,277
Net income (loss)                 25,015 20,680 21,789
Preferred stock dividends of subsidiaries                 534 534 534
Net income attributable to Hawaiian Electric                 24,481 20,146 21,255
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 24,481 20,146 21,255
Maui Electric Company, Limited (MECO)                      
Revenues                 368,700 325,678 308,705
Expenses                      
Fuel oil                 146,030 115,670 94,251
Purchased power                 49,019 44,673 50,713
Other operation and maintenance                 77,749 71,332 67,597
Depreciation                 25,981 23,154 23,178
Taxes, other than income taxes                 34,699 30,832 29,230
Total expenses                 333,478 285,661 264,969
Operating income                 35,222 40,017 43,736
Allowance for equity funds used during construction                 1,191 1,033 901
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 (565) (861) (863)
Interest expense and other charges, net                 (9,550) (9,644) (9,536)
Allowance for borrowed funds used during construction                 572 451 366
Income before income taxes                 26,870 30,996 34,604
Income taxes                 5,577 12,704 13,087
Net income (loss)                 21,293 18,292 21,517
Preferred stock dividends of subsidiaries                 381 381 381
Net income attributable to Hawaiian Electric                 20,912 17,911 21,136
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 20,912 17,911 21,136
Other subsidiaries                      
Revenues                 0 0 0
Expenses                      
Fuel oil                 0 0 0
Purchased power                 0 0 0
Other operation and maintenance                 0 0 0
Depreciation                 0 0 0
Taxes, other than income taxes                 0 0 0
Total expenses                 0 0 0
Operating income                 0 0 0
Allowance for equity funds used during construction                 0 0 0
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 0 0 0
Interest expense and other charges, net                 0   0
Allowance for borrowed funds used during construction                 0 0 0
Income before income taxes                 0 0 0
Income taxes                 0 0 0
Net income (loss)                 0 0 0
Preferred stock dividends of subsidiaries                 0 0 0
Net income attributable to Hawaiian Electric                 0 0 0
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 0 0 0
Consolidating adjustments                      
Revenues                 (218) (83) (106)
Expenses                      
Fuel oil                 0 0 0
Purchased power                 0 0 0
Other operation and maintenance                 0 0 0
Depreciation                 0 0 0
Taxes, other than income taxes                 0 0 0
Total expenses                 0 0 0
Operating income                 (218) (83) (106)
Allowance for equity funds used during construction                 0 0 0
Equity in earnings of subsidiaries                 (45,393) (38,057) (42,391)
Retirement defined benefits expense—other than service costs                 0 0 0
Interest expense and other charges, net                 218 83 106
Allowance for borrowed funds used during construction                 0 0 0
Income before income taxes                 (45,393) (38,057) (42,391)
Income taxes                 0 0 0
Net income (loss)                 (45,393) (38,057) (42,391)
Preferred stock dividends of subsidiaries                 0 0 0
Net income attributable to Hawaiian Electric                 (45,393) (38,057) (42,391)
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 (45,393) (38,057) (42,391)
HECO Consolidated                      
Revenues                 2,546,525 2,257,566 2,094,368
Expenses                      
Fuel oil                 760,528 587,768 454,704
Purchased power                 639,307 586,634 562,740
Other operation and maintenance                 461,491 411,907 399,931
Depreciation                 203,626 192,784 187,061
Taxes, other than income taxes                 239,912 214,949 199,862
Total expenses                 2,304,864 1,994,042 1,804,298
Operating income 61,112 74,036 55,144 51,369 68,184 88,497 56,482 50,361 241,661 263,524 290,070
Allowance for equity funds used during construction                 10,877 12,483 8,325
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 (3,631) (6,003) (5,602)
Interest expense and other charges, net                 (73,348) (69,637) (66,824)
Allowance for borrowed funds used during construction                 4,867 4,778 3,144
Income before income taxes                 180,426 205,145 229,113
Income taxes                 34,778 83,199 84,801
Net income (loss) 35,796 50,210 31,668 27,974 25,854 47,985 26,143 21,964 145,648 121,946 144,312
Preferred stock dividends of subsidiaries                 915 915 915
Net income attributable to Hawaiian Electric                 144,733 121,031 143,397
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock $ 35,297 $ 49,712 $ 31,169 $ 27,475 $ 25,355 $ 47,487 $ 25,644 $ 21,465 $ 143,653 $ 119,951 $ 142,317