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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Income Statements, Captions [Line Items]            
Revenues $ 608,945   $ 715,485   $ 1,286,131 $ 1,377,100
Expenses            
Total expenses 537,389   642,851   1,154,873 1,226,529
Total operating income 71,556   72,634   131,258 150,571
Allowance for equity funds used during construction 2,194   3,175   4,209 6,085
Retirement defined benefits expense—other than service costs (934)   (761)   (1,868) (1,524)
Allowance for borrowed funds used during construction 752   1,179   1,440 2,257
Income before income taxes 60,230   52,694   99,926 110,733
Income taxes 10,870   9,709   16,673 21,587
Net income 49,360   42,985   83,253 89,146
Preferred stock dividends of subsidiaries 473   473   946 946
Net income for common stock 48,887 $ 33,420 42,512 $ 45,688 82,307 88,200
Consolidating adjustments            
Condensed Income Statements, Captions [Line Items]            
Revenues (140)   (202)   (355) (234)
Expenses            
Fuel oil 0   0   0 0
Purchased power 0   0   0 0
Other operation and maintenance 0   0   0 0
Depreciation 0   0   0 0
Taxes, other than income taxes 0   0   0 0
Total expenses 0   0   0 0
Total operating income (140)   (202)   (355) (234)
Allowance for equity funds used during construction 0   0   0 0
Equity in earnings of subsidiaries (13,776)   (8,086)   (22,580) (19,935)
Retirement defined benefits expense—other than service costs 0   0   0 0
Interest expense and other charges, net 140   202   355 234
Allowance for borrowed funds used during construction 0   0   0 0
Income before income taxes (13,776)   (8,086)   (22,580) (19,935)
Income taxes   0   0 0
Net income (13,776)   (8,086)   (22,580) (19,935)
Preferred stock dividends of subsidiaries   0   0 0
Net income attributable to Hawaiian Electric (13,776)   (8,086)   (22,580) (19,935)
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock (13,776)   (8,086)   (22,580) (19,935)
Hawaiian Electric (parent only)            
Expenses            
Purchased power 137,000   162,000   277,000 296,000
Hawaiian Electric (parent only) | Reportable Legal Entities            
Condensed Income Statements, Captions [Line Items]            
Revenues 380,634   450,020   801,800 855,689
Expenses            
Fuel oil 77,290   125,431   197,825 234,353
Purchased power 108,946   126,871   216,897 232,094
Other operation and maintenance 74,274   78,551   159,911 159,729
Depreciation 37,860   35,868   75,871 71,735
Taxes, other than income taxes 36,673   42,590   77,174 81,221
Total expenses 335,043   409,311   727,678 779,132
Total operating income 45,591   40,709   74,122 76,557
Allowance for equity funds used during construction 1,807   2,614   3,550 5,061
Equity in earnings of subsidiaries 13,776   8,086   22,580 19,935
Retirement defined benefits expense—other than service costs (546)   (567)   (1,092) (1,134)
Interest expense and other charges, net (12,499)   (13,390)   (24,501) (26,190)
Allowance for borrowed funds used during construction 626   962   1,228 1,864
Income before income taxes 48,755   38,414   75,887 76,093
Income taxes 6,156   5,570   9,113 10,853
Net income 42,599   32,844   66,774 65,240
Preferred stock dividends of subsidiaries 0   0   0 0
Net income attributable to Hawaiian Electric 42,599   32,844   66,774 65,240
Preferred stock dividends of Hawaiian Electric 270   270   540 540
Net income for common stock 42,329   32,574   66,234 64,700
HELCO | Reportable Legal Entities            
Condensed Income Statements, Captions [Line Items]            
Revenues 78,505   89,916   167,798 177,121
Expenses            
Fuel oil 16,254   19,941   38,686 40,783
Purchased power 15,846   24,029   35,367 43,206
Other operation and maintenance 17,581   18,031   36,685 36,767
Depreciation 9,761   10,453   19,521 20,906
Taxes, other than income taxes 7,470   8,706   15,812 16,811
Total expenses 66,912   81,160   146,071 158,473
Total operating income 11,593   8,756   21,727 18,648
Allowance for equity funds used during construction 193   218   312 350
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits expense—other than service costs 193   (105)   387 (211)
Interest expense and other charges, net (2,533)   (2,920)   (5,017) (5,821)
Allowance for borrowed funds used during construction 62   91   98 147
Income before income taxes 9,508   6,040   17,507 13,113
Income taxes 2,196   1,241   3,994 3,011
Net income 7,312   4,799   13,513 10,102
Preferred stock dividends of subsidiaries 133   133   267 267
Net income attributable to Hawaiian Electric 7,179   4,666   13,246 9,835
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock 7,179   4,666   13,246 9,835
Maui Electric | Reportable Legal Entities            
Condensed Income Statements, Captions [Line Items]            
Revenues 75,216   94,050   162,414 179,703
Expenses            
Fuel oil 18,907   36,248   49,161 67,093
Purchased power 12,046   11,954   24,390 21,999
Other operation and maintenance 18,186   22,678   40,992 40,894
Depreciation 8,075   7,592   16,154 15,219
Taxes, other than income taxes 7,245   9,147   15,452 17,215
Total expenses 64,459   87,619   146,149 162,420
Total operating income 10,757   6,431   16,265 17,283
Allowance for equity funds used during construction 194   343   347 674
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits expense—other than service costs (29)   (29)   (58) (59)
Interest expense and other charges, net (2,446)   (2,422)   (4,769) (4,739)
Allowance for borrowed funds used during construction 64   126   114 246
Income before income taxes 8,540   4,449   11,899 13,405
Income taxes 1,847   933   2,374 3,114
Net income 6,693   3,516   9,525 10,291
Preferred stock dividends of subsidiaries 96   96   191 191
Net income attributable to Hawaiian Electric 6,597   3,420   9,334 10,100
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock 6,597   3,420   9,334 10,100
Other subsidiaries | Reportable Legal Entities            
Condensed Income Statements, Captions [Line Items]            
Revenues 0   0   0 0
Expenses            
Fuel oil 0   0   0 0
Purchased power 0   0   0 0
Other operation and maintenance 0   0   0 0
Depreciation 0   0   0 0
Taxes, other than income taxes 0   0   0 0
Total expenses 0   0   0 0
Total operating income 0   0   0 0
Allowance for equity funds used during construction 0   0   0 0
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits expense—other than service costs 0   0   0 0
Interest expense and other charges, net 0   0   0 0
Allowance for borrowed funds used during construction 0   0   0 0
Income before income taxes 0   0   0 0
Income taxes   0   0 0
Net income 0   0   0 0
Preferred stock dividends of subsidiaries 0   0   0 0
Net income attributable to Hawaiian Electric 0   0   0 0
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock 0   0   0 0
Hawaiian Electric Company, Inc. and Subsidiaries            
Condensed Income Statements, Captions [Line Items]            
Revenues 534,215   633,784   1,131,657 1,212,279
Expenses            
Fuel oil 112,451   181,620   285,672 342,229
Purchased power 136,838   162,854   276,654 297,299
Other operation and maintenance 110,041   119,260   237,588 237,390
Depreciation 55,696   53,913   111,546 107,860
Taxes, other than income taxes 51,388   60,443   108,438 115,247
Total expenses 466,414   578,090   1,019,898 1,100,025
Total operating income 67,801   55,694   111,759 112,254
Allowance for equity funds used during construction 2,194   3,175   4,209 6,085
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits expense—other than service costs (382)   (701)   (763) (1,404)
Interest expense and other charges, net (17,338)   (18,530)   (33,932) (36,516)
Allowance for borrowed funds used during construction 752   1,179   1,440 2,257
Income before income taxes 53,027   40,817   82,713 82,676
Income taxes 10,199   7,744   15,481 16,978
Net income 42,828   33,073   67,232 65,698
Preferred stock dividends of subsidiaries 229   229   458 458
Net income attributable to Hawaiian Electric 42,599   32,844   66,774 65,240
Preferred stock dividends of Hawaiian Electric 270   270   540 540
Net income for common stock $ 42,329 $ 23,905 $ 32,574 $ 32,126 $ 66,234 $ 64,700