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Electric utility segment - Consolidating Statement of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]                      
Revenues $ 652,217 $ 641,427 $ 608,945 $ 677,186 $ 725,966 $ 770,882 $ 715,485 $ 661,615 $ 2,579,775 $ 2,873,948 $ 2,860,849
Expenses                      
Total expenses                 2,268,282 2,525,927 2,527,493
Operating income 80,674 99,561 71,556 59,702 100,795 96,655 72,634 77,937 311,493 348,021 333,356
Allowance for equity funds used during construction                 8,768 11,987 10,877
Retirement defined benefits expense—other than service costs                 (3,210) (2,806) (5,962)
Allowance for borrowed funds used during construction                 2,992 4,453 4,867
Income before income taxes                 240,624 271,409 254,461
Income taxes                 40,910 51,637 50,797
Net income (loss) 50,958 65,503 49,360 33,893 66,736 63,890 42,985 46,161 199,714 219,772 203,664
Preferred stock dividends of subsidiaries                 1,890 1,890 1,890
Net income for common stock 50,485 65,032 48,887 33,420 66,263 63,419 42,512 45,688 197,824 217,882 201,774
Hawaiian Electric (parent only)                      
Expenses                      
Total expenses                 21,870 20,335 20,621
Retirement defined benefits expense—other than service costs                 (634) (442) (674)
Income before income taxes                 186,565 208,075 193,442
Income taxes                 (11,259) (9,807) (8,332)
Net income (loss)                 197,824 217,882 201,774
Hawaiian Electric Company, Inc. and Subsidiaries                      
Condensed Income Statements, Captions [Line Items]                      
Revenues 571,095 562,568 534,215 597,442 645,333 688,330 633,784 578,495 2,265,320 2,545,942 2,546,525
Expenses                      
Fuel oil                 515,274 720,709 760,528
Purchased power                 568,749 633,256 639,307
Other operation and maintenance                 474,192 481,737 461,491
Depreciation                 222,733 215,731 203,626
Taxes, other than income taxes                 215,822 240,131 239,912
Total expenses                 1,996,770 2,291,564 2,304,864
Operating income 68,273 88,518 67,801 43,958 70,331 71,793 55,694 56,560 268,550 254,378 241,661
Allowance for equity funds used during construction                 8,768 11,987 10,877
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 (763) (2,836) (3,631)
Interest expense and other charges, net                 (67,794) (70,842) (73,348)
Allowance for borrowed funds used during construction                 2,992 4,453 4,867
Income before income taxes                 211,753 197,140 180,426
Income taxes                 40,418 38,305 34,778
Net income (loss) 43,540 60,563 42,828 24,404 45,860 47,277 33,073 32,625 171,335 158,835 145,648
Preferred stock dividends of subsidiaries                 915 915 915
Net income attributable to Hawaiian Electric                 170,420 157,920 144,733
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock $ 43,041 $ 60,065 $ 42,329 $ 23,905 $ 45,361 $ 46,779 $ 32,574 $ 32,126 169,340 156,840 143,653
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaiian Electric (parent only)                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 1,608,305 1,803,698 1,802,550
Expenses                      
Fuel oil                 354,087 494,728 523,706
Purchased power                 446,672 494,215 494,450
Other operation and maintenance                 311,781 319,771 313,346
Depreciation                 151,387 143,470 137,410
Taxes, other than income taxes                 154,191 170,979 170,363
Total expenses                 1,418,118 1,623,163 1,639,275
Operating income                 190,187 180,535 163,275
Allowance for equity funds used during construction                 7,335 9,955 9,208
Equity in earnings of subsidiaries                 47,504 43,167 45,393
Retirement defined benefits expense—other than service costs                 (1,294) (2,287) (2,649)
Interest expense and other charges, net                 (48,775) (51,199) (52,180)
Allowance for borrowed funds used during construction                 2,540 3,666 4,019
Income before income taxes                 197,497 183,837 167,066
Income taxes                 27,077 25,917 22,333
Net income (loss)                 170,420 157,920 144,733
Preferred stock dividends of subsidiaries                 0 0 0
Net income attributable to Hawaiian Electric                 170,420 157,920 144,733
Preferred stock dividends of Hawaiian Electric                 1,080 1,080 1,080
Net income for common stock                 169,340 156,840 143,653
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | HELCO                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 334,221 364,590 375,493
Expenses                      
Fuel oil                 72,202 84,565 90,792
Purchased power                 73,120 90,989 95,838
Other operation and maintenance                 73,746 76,091 70,396
Depreciation                 39,041 41,812 40,235
Taxes, other than income taxes                 31,181 33,787 34,850
Total expenses                 289,290 327,244 332,111
Operating income                 44,931 37,346 43,382
Allowance for equity funds used during construction                 543 816 478
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 672 (422) (417)
Interest expense and other charges, net                 (10,004) (10,741) (11,836)
Allowance for borrowed funds used during construction                 160 342 276
Income before income taxes                 36,302 27,341 31,883
Income taxes                 8,275 5,990 6,868
Net income (loss)                 28,027 21,351 25,015
Preferred stock dividends of subsidiaries                 534 534 534
Net income attributable to Hawaiian Electric                 27,493 20,817 24,481
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 27,493 20,817 24,481
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Maui Electric                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 323,430 378,202 368,700
Expenses                      
Fuel oil                 88,985 141,416 146,030
Purchased power                 48,957 48,052 49,019
Other operation and maintenance                 88,665 85,875 77,749
Depreciation                 32,305 30,449 25,981
Taxes, other than income taxes                 30,450 35,365 34,699
Total expenses                 289,362 341,157 333,478
Operating income                 34,068 37,045 35,222
Allowance for equity funds used during construction                 890 1,216 1,191
Equity in earnings of subsidiaries                 0 0 0
Retirement defined benefits expense—other than service costs                 (141) (127) (565)
Interest expense and other charges, net                 (9,651) (9,450) (9,550)
Allowance for borrowed funds used during construction                 292 445 572
Income before income taxes                 25,458 29,129 26,870
Income taxes                 5,066 6,398 5,577
Net income (loss)                 20,392 22,731 21,293
Preferred stock dividends of subsidiaries                 381 381 381
Net income attributable to Hawaiian Electric                 20,011 22,350 20,912
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 20,011 22,350 20,912
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Other subsidiaries                      
Condensed Income Statements, Captions [Line Items]                      
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 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
Hawaiian Electric Company, Inc. and Subsidiaries | Consolidating Adjustments                      
Condensed Income Statements, Captions [Line Items]                      
Revenues                 (636) (548) (218)
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                 (636) (548) (218)
Allowance for equity funds used during construction                 0 0 0
Equity in earnings of subsidiaries                 (47,504) (43,167) (45,393)
Retirement defined benefits expense—other than service costs                 0 0 0
Interest expense and other charges, net                 636 548 218
Allowance for borrowed funds used during construction                 0 0 0
Income before income taxes                 (47,504) (43,167) (45,393)
Income taxes                 0 0 0
Net income (loss)                 (47,504) (43,167) (45,393)
Preferred stock dividends of subsidiaries                 0 0 0
Net income attributable to Hawaiian Electric                 (47,504) (43,167) (45,393)
Preferred stock dividends of Hawaiian Electric                 0 0 0
Net income for common stock                 $ (47,504) $ (43,167) $ (45,393)