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Electric utility segment - Consolidating Statement of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | $ 3,741,985 | $ 2,850,379 | $ 2,579,775
Expenses |  |  |
Total expenses | 3,360,912 | 2,464,313 | 2,268,282
Operating income | 381,073 | 386,066 | 311,493
Allowance for equity funds used during construction | 10,574 | 9,534 | 8,768
Retirement defined benefits credit (expense)—other than service costs | 4,411 | 5,848 | (3,210)
Allowance for borrowed funds used during construction | 3,416 | 3,250 | 2,992
Income before income taxes | 304,195 | 310,863 | 240,624
Income taxes | 61,167 | 62,807 | 40,910
Net income | 243,028 | 248,056 | 199,714
Preferred stock dividends of Hawaiian Electric | 1,890 | 1,890 | 1,890
Net income for common stock | 241,138 | 246,166 | 197,824
Hawaiian Electric (parent only) |  |  |
Expenses |  |  |
Total expenses | 21,981 | 24,934 | 21,870
Retirement defined benefits credit (expense)—other than service costs | (147) | 114 | (634)
Income before income taxes | 229,271 | 235,584 | 186,565
Income taxes | (11,867) | (10,582) | (11,259)
Net income for common stock | 241,138 | 246,166 | 197,824
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | 3,408,587 | 2,539,636 | 2,265,320
Expenses |  |  |
Fuel oil | 1,265,614 | 644,349 | 515,274
Purchased power | 793,584 | 670,494 | 568,749
Other operation and maintenance | 497,601 | 475,412 | 474,192
Depreciation | 235,424 | 229,469 | 222,733
Taxes, other than income taxes | 317,173 | 240,354 | 215,822
Total expenses | 3,109,396 | 2,260,078 | 1,996,770
Operating income | 299,191 | 279,558 | 268,550
Allowance for equity funds used during construction | 10,574 | 9,534 | 8,768
Equity in earnings of subsidiaries | 0 | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 3,835 | 3,890 | (763)
Interest expense and other charges, net | (76,416) | (72,447) | (67,794)
Allowance for borrowed funds used during construction | 3,416 | 3,250 | 2,992
Income before income taxes | 240,600 | 223,785 | 211,753
Income taxes | 49,676 | 44,148 | 40,418
Net income (loss) | 190,924 | 179,637 | 171,335
Preferred stock dividends of subsidiaries | 915 | 915 | 915
Net income | 190,009 | 178,722 | 170,420
Preferred stock dividends of Hawaiian Electric | 1,080 | 1,080 | 1,080
Net income for common stock | 188,929 | 177,642 | 169,340
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaiian Electric (parent only) |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | 2,452,969 | 1,793,372 | 1,608,305
Expenses |  |  |
Fuel oil | 917,801 | 442,818 | 354,087
Purchased power | 601,235 | 508,642 | 446,672
Other operation and maintenance | 326,785 | 313,009 | 311,781
Depreciation | 158,725 | 155,607 | 151,387
Taxes, other than income taxes | 228,843 | 170,604 | 154,191
Total expenses | 2,233,389 | 1,590,680 | 1,418,118
Operating income | 219,580 | 202,692 | 190,187
Allowance for equity funds used during construction | 8,464 | 7,734 | 7,335
Equity in earnings of subsidiaries | 47,493 | 45,353 | 47,504
Retirement defined benefits credit (expense)—other than service costs | 3,296 | 3,348 | (1,294)
Interest expense and other charges, net | (55,260) | (51,680) | (48,775)
Allowance for borrowed funds used during construction | 2,769 | 2,617 | 2,540
Income before income taxes | 226,342 | 210,064 | 197,497
Income taxes | 36,333 | 31,342 | 27,077
Net income (loss) | 190,009 | 178,722 | 170,420
Preferred stock dividends of subsidiaries | 0 | 0 | 0
Net income | 190,009 | 178,722 | 170,420
Preferred stock dividends of Hawaiian Electric | 1,080 | 1,080 | 1,080
Net income for common stock | 188,929 | 177,642 | 169,340
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Hawaii Electric Light |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | 485,590 | 381,033 | 334,221
Expenses |  |  |
Fuel oil | 133,238 | 80,086 | 72,202
Purchased power | 143,636 | 108,997 | 73,120
Other operation and maintenance | 85,110 | 79,390 | 73,746
Depreciation | 41,404 | 40,201 | 39,041
Taxes, other than income taxes | 44,685 | 35,499 | 31,181
Total expenses | 448,073 | 344,173 | 289,290
Operating income | 37,517 | 36,860 | 44,931
Allowance for equity funds used during construction | 898 | 586 | 543
Equity in earnings of subsidiaries | 0 | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | 666 | 670 | 672
Interest expense and other charges, net | (10,659) | (10,353) | (10,004)
Allowance for borrowed funds used during construction | 277 | 197 | 160
Income before income taxes | 28,699 | 27,960 | 36,302
Income taxes | 6,349 | 6,246 | 8,275
Net income (loss) | 22,350 | 21,714 | 28,027
Preferred stock dividends of subsidiaries | 534 | 534 | 534
Net income | 21,816 | 21,180 | 27,493
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0
Net income for common stock | 21,816 | 21,180 | 27,493
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Maui Electric |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | 470,355 | 365,256 | 323,430
Expenses |  |  |
Fuel oil | 214,575 | 121,445 | 88,985
Purchased power | 48,713 | 52,855 | 48,957
Other operation and maintenance | 85,706 | 83,013 | 88,665
Depreciation | 35,295 | 33,661 | 32,305
Taxes, other than income taxes | 43,645 | 34,251 | 30,450
Total expenses | 427,934 | 325,225 | 289,362
Operating income | 42,421 | 40,031 | 34,068
Allowance for equity funds used during construction | 1,212 | 1,214 | 890
Equity in earnings of subsidiaries | 0 | 0 | 0
Retirement defined benefits credit (expense)—other than service costs | (127) | (128) | (141)
Interest expense and other charges, net | (10,824) | (10,439) | (9,651)
Allowance for borrowed funds used during construction | 370 | 436 | 292
Income before income taxes | 33,052 | 31,114 | 25,458
Income taxes | 6,994 | 6,560 | 5,066
Net income (loss) | 26,058 | 24,554 | 20,392
Preferred stock dividends of subsidiaries | 381 | 381 | 381
Net income | 25,677 | 24,173 | 20,011
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0
Net income for common stock | 25,677 | 24,173 | 20,011
Hawaiian Electric Company, Inc. and Subsidiaries | Reportable Legal Entities | Other subsidiaries |  |  |
Expenses |  |  |
Allowance for equity funds used during construction | 0 | 0 | 0
Net income (loss) | 0 | 0 | 0
Hawaiian Electric Company, Inc. and Subsidiaries | Consolidating adjustments |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Revenues | (327) | (25) | (636)
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 | (327) | (25) | (636)
Allowance for equity funds used during construction | 0 | 0 | 0
Equity in earnings of subsidiaries | (47,493) | (45,353) | (47,504)
Retirement defined benefits credit (expense)—other than service costs | 0 | 0 | 0
Interest expense and other charges, net | 327 | 25 | 636
Allowance for borrowed funds used during construction | 0 | 0 | 0
Income before income taxes | (47,493) | (45,353) | (47,504)
Income taxes | 0 | 0 | 0
Net income (loss) | (47,493) | (45,353) | (47,504)
Preferred stock dividends of subsidiaries | 0 | 0 | 0
Net income | (47,493) | (45,353) | (47,504)
Preferred stock dividends of Hawaiian Electric | 0 | 0 | 0
Net income for common stock | $ (47,493) | $ (45,353) | $ (47,504)

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