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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Condensed Income Statements, Captions [Line Items]            
Revenues $ 680,257   $ 608,945   $ 1,323,203 $ 1,286,131
Expenses            
Total expenses 578,401   537,389   1,123,316 1,154,873
Total operating income 101,856   71,556   199,887 131,258
Allowance for equity funds used during construction 2,377   2,194   4,568 4,209
Retirement defined benefits credit (expense)—other than service costs 1,216   (934)   3,651 (1,868)
Allowance for borrowed funds used during construction 812   752   1,559 1,440
Income before income taxes 82,944   60,230   163,140 99,926
Income taxes 18,599   10,870   33,964 16,673
Net income 64,345   49,360   129,176 83,253
Preferred stock dividends of subsidiaries 473   473   946 946
Net income for common stock 63,872 $ 64,358 48,887 $ 33,420 128,230 82,307
Hawaiian Electric Consolidated            
Condensed Income Statements, Captions [Line Items]            
Revenues 601,879   534,215   1,166,743 1,131,657
Expenses            
Fuel oil 139,136   112,451   266,563 285,672
Purchased power 162,465   136,838   304,761 276,654
Other operation and maintenance 118,142   110,041   232,712 237,588
Depreciation 57,381   55,696   114,736 111,546
Taxes, other than income taxes 57,071   51,388   111,173 108,438
Total expenses 534,195   466,414   1,029,945 1,019,898
Total operating income 67,684   67,801   136,798 111,759
Allowance for equity funds used during construction 2,377   2,194   4,568 4,209
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits credit (expense)—other than service costs 1,020   (382)   2,041 (763)
Interest expense and other charges, net (17,995)   (17,338)   (35,978) (33,932)
Allowance for borrowed funds used during construction 812   752   1,559 1,440
Income before income taxes 53,898   53,027   108,988 82,713
Income taxes 11,498   10,199   22,731 15,481
Net income 42,400   42,828   86,257 67,232
Preferred stock dividends of subsidiaries 229   229   458 458
Net income attributable to Hawaiian Electric 42,171   42,599   85,799 66,774
Preferred stock dividends of Hawaiian Electric 270   270   540 540
Net income for common stock 41,901 $ 43,358 42,329 $ 23,905 85,259 66,234
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaiian Electric Industries, Inc.            
Condensed Income Statements, Captions [Line Items]            
Revenues 422,697   380,634   823,251 801,800
Expenses            
Fuel oil 91,345   77,290   180,073 197,825
Purchased power 124,948   108,946   233,552 216,897
Other operation and maintenance 77,903   74,274   155,238 159,911
Depreciation 38,907   37,860   77,821 75,871
Taxes, other than income taxes 40,301   36,673   78,928 77,174
Total expenses 373,404   335,043   725,612 727,678
Total operating income 49,293   45,591   97,639 74,122
Allowance for equity funds used during construction 1,930   1,807   3,678 3,550
Equity in earnings of subsidiaries 10,744   13,776   23,254 22,580
Retirement defined benefits credit (expense)—other than service costs 884   (546)   1,770 (1,092)
Interest expense and other charges, net (12,829)   (12,499)   (25,661) (24,501)
Allowance for borrowed funds used during construction 654   626   1,245 1,228
Income before income taxes 50,676   48,755   101,925 75,887
Income taxes 8,505   6,156   16,126 9,113
Net income 42,171   42,599   85,799 66,774
Preferred stock dividends of subsidiaries 0   0   0 0
Net income attributable to Hawaiian Electric 42,171   42,599   85,799 66,774
Preferred stock dividends of Hawaiian Electric 270   270   540 540
Net income for common stock 41,901   42,329   85,259 66,234
Hawaiian Electric Consolidated | Reportable Legal Entities | Hawaii Electric Light            
Condensed Income Statements, Captions [Line Items]            
Revenues 91,512   78,505   176,661 167,798
Expenses            
Fuel oil 19,586   16,254   36,071 38,686
Purchased power 24,236   15,846   45,833 35,367
Other operation and maintenance 19,474   17,581   37,386 36,685
Depreciation 10,053   9,761   20,101 19,521
Taxes, other than income taxes 8,539   7,470   16,532 15,812
Total expenses 81,888   66,912   155,923 146,071
Total operating income 9,624   11,593   20,738 21,727
Allowance for equity funds used during construction 140   193   272 312
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits credit (expense)—other than service costs 169   193   337 387
Interest expense and other charges, net (2,573)   (2,533)   (5,154) (5,017)
Allowance for borrowed funds used during construction 48   62   92 98
Income before income taxes 7,408   9,508   16,285 17,507
Income taxes 1,668   2,196   3,719 3,994
Net income 5,740   7,312   12,566 13,513
Preferred stock dividends of subsidiaries 133   133   267 267
Net income attributable to Hawaiian Electric 5,607   7,179   12,299 13,246
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock 5,607   7,179   12,299 13,246
Hawaiian Electric Consolidated | Reportable Legal Entities | Maui Electric            
Condensed Income Statements, Captions [Line Items]            
Revenues 87,670   75,216   166,851 162,414
Expenses            
Fuel oil 28,205   18,907   50,419 49,161
Purchased power 13,281   12,046   25,376 24,390
Other operation and maintenance 20,765   18,186   40,088 40,992
Depreciation 8,421   8,075   16,814 16,154
Taxes, other than income taxes 8,231   7,245   15,713 15,452
Total expenses 78,903   64,459   148,410 146,149
Total operating income 8,767   10,757   18,441 16,265
Allowance for equity funds used during construction 307   194   618 347
Equity in earnings of subsidiaries 0   0   0 0
Retirement defined benefits credit (expense)—other than service costs (33)   (29)   (66) (58)
Interest expense and other charges, net (2,593)   (2,446)   (5,183) (4,769)
Allowance for borrowed funds used during construction 110   64   222 114
Income before income taxes 6,558   8,540   14,032 11,899
Income taxes 1,325   1,847   2,886 2,374
Net income 5,233   6,693   11,146 9,525
Preferred stock dividends of subsidiaries 96   96   191 191
Net income attributable to Hawaiian Electric 5,137   6,597   10,955 9,334
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock 5,137   6,597   10,955 9,334
Hawaiian Electric Consolidated | Reportable Legal Entities | Other subsidiaries            
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 credit (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
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 Consolidated | Consolidating adjustments            
Condensed Income Statements, Captions [Line Items]            
Revenues 0   (140)   (20) (355)
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   (140)   (20) (355)
Allowance for equity funds used during construction 0   0   0 0
Equity in earnings of subsidiaries (10,744)   (13,776)   (23,254) (22,580)
Retirement defined benefits credit (expense)—other than service costs 0   0   0 0
Interest expense and other charges, net 0   140   20 355
Allowance for borrowed funds used during construction 0   0   0 0
Income before income taxes (10,744)   (13,776)   (23,254) (22,580)
Income taxes     0 0
Net income (10,744)   (13,776)   (23,254) (22,580)
Preferred stock dividends of subsidiaries     0 0
Net income attributable to Hawaiian Electric (10,744)   (13,776)   (23,254) (22,580)
Preferred stock dividends of Hawaiian Electric 0   0   0 0
Net income for common stock $ (10,744)   $ (13,776)   $ (23,254) $ (22,580)