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Electric utility segment - Condensed consolidating statement of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Condensed Income Statements, Captions [Line Items]        
Revenues $ 685,277 $ 632,281 $ 1,331,151 $ 1,223,843
Expenses        
Purchased power 161,000 153,000 301,000 280,000
Total expenses 606,478 554,479 1,180,463 1,076,303
Total operating income 78,799 77,802 150,688 147,540
Allowance for equity funds used during construction 2,983 3,027 6,277 5,426
Less: Retirement defined benefits expense—other than service costs (1,564) (1,906) (3,397) (3,782)
Allowance for borrowed funds used during construction 1,365 1,143 2,809 2,032
Income before income taxes 59,582 59,626 112,858 111,208
Income taxes 13,055 20,492 25,611 37,408
Net income 46,527 39,134 87,247 73,800
Preferred stock dividends of subsidiaries 473 473 946 946
Net income for common stock 46,054 38,661 86,301 72,854
Consolidating adjustments        
Condensed Income Statements, Captions [Line Items]        
Revenues (59) (14) (101) (21)
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 (59) (14) (101) (21)
Allowance for equity funds used during construction 0 0 0 0
Equity in earnings of subsidiaries (9,080) (7,936) (18,405) (16,539)
Less: Retirement defined benefits expense—other than service costs 0 0 0 0
Interest expense and other charges, net 59 14 101 21
Allowance for borrowed funds used during construction 0 0 0 0
Income before income taxes (9,080) (7,936) (18,405) (16,539)
Income taxes 0 0 0 0
Net income (9,080) (7,936) (18,405) (16,539)
Preferred stock dividends of subsidiaries 0 0 0 0
Net income attributable to Hawaiian Electric (9,080) (7,936) (18,405) (16,539)
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock (9,080) (7,936) (18,405) (16,539)
Hawaiian Electric (parent only)        
Expenses        
Other operation and maintenance   69,659   135,652
Total expenses   356,273   688,176
Total operating income   38,141   69,081
Less: Retirement defined benefits expense—other than service costs   (1,302)   (2,587)
Hawaiian Electric (parent only) | Reportable Legal Entities        
Condensed Income Statements, Captions [Line Items]        
Revenues 431,699 394,414 832,879 757,257
Expenses        
Fuel oil 120,007 99,814 234,505 197,815
Purchased power 121,812 116,458 229,182 216,605
Other operation and maintenance 76,845 69,659 149,785 135,652
Depreciation 34,391 32,723 68,830 65,445
Taxes, other than income taxes 40,951 37,619 79,118 72,659
Total expenses 394,006 356,273 761,420 688,176
Total operating income 37,693 38,141 71,459 69,081
Allowance for equity funds used during construction 2,588 2,659 5,475 4,715
Equity in earnings of subsidiaries 9,080 7,936 18,405 16,539
Less: Retirement defined benefits expense—other than service costs (554) (1,302) (1,616) (2,587)
Interest expense and other charges, net (12,930) (12,562) (25,425) (24,619)
Allowance for borrowed funds used during construction 1,150 988 2,388 1,737
Income before income taxes 37,027 35,860 70,686 64,866
Income taxes 5,588 9,946 11,502 17,217
Net income 31,439 25,914 59,184 47,649
Preferred stock dividends of subsidiaries 0 0 0 0
Net income attributable to Hawaiian Electric 31,439 25,914 59,184 47,649
Preferred stock dividends of Hawaiian Electric 270 270 540 540
Net income for common stock 31,169 25,644 58,644 47,109
HELCO        
Expenses        
Other operation and maintenance   17,643   33,242
Total expenses   72,988   141,568
Total operating income   8,722   19,124
Less: Retirement defined benefits expense—other than service costs   85   168
HELCO | Reportable Legal Entities        
Condensed Income Statements, Captions [Line Items]        
Revenues 89,548 81,710 177,481 160,692
Expenses        
Fuel oil 19,432 14,475 37,919 31,732
Purchased power 24,664 23,482 48,498 42,071
Other operation and maintenance 19,015 17,643 35,113 33,242
Depreciation 10,038 9,686 20,093 19,371
Taxes, other than income taxes 8,408 7,702 16,620 15,152
Total expenses 81,557 72,988 158,243 141,568
Total operating income 7,991 8,722 19,238 19,124
Allowance for equity funds used during construction 124 134 235 249
Equity in earnings of subsidiaries 0 0 0 0
Less: Retirement defined benefits expense—other than service costs (105) 85 (208) 168
Interest expense and other charges, net (2,922) (2,996) (5,829) (6,000)
Allowance for borrowed funds used during construction 77 55 141 100
Income before income taxes 5,165 6,000 13,577 13,641
Income taxes 1,269 2,235 3,446 5,158
Net income 3,896 3,765 10,131 8,483
Preferred stock dividends of subsidiaries 133 133 267 267
Net income attributable to Hawaiian Electric 3,763 3,632 9,864 8,216
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock 3,763 3,632 9,864 8,216
Maui Electric        
Expenses        
Other operation and maintenance   17,637   34,862
Total expenses   71,132   138,899
Total operating income   9,633   18,659
Less: Retirement defined benefits expense—other than service costs   (218)   (439)
Maui Electric | Reportable Legal Entities        
Condensed Income Statements, Captions [Line Items]        
Revenues 86,938 80,765 168,294 157,558
Expenses        
Fuel oil 32,278 26,970 66,261 55,982
Purchased power 14,262 13,127 22,968 21,515
Other operation and maintenance 16,782 17,637 35,354 34,862
Depreciation 5,932 5,747 11,904 11,556
Taxes, other than income taxes 8,165 7,651 15,890 14,984
Total expenses 77,419 71,132 152,377 138,899
Total operating income 9,519 9,633 15,917 18,659
Allowance for equity funds used during construction 271 234 567 462
Equity in earnings of subsidiaries 0 0 0 0
Less: Retirement defined benefits expense—other than service costs (329) (218) (428) (439)
Interest expense and other charges, net (2,367) (2,670) (4,701) (5,120)
Allowance for borrowed funds used during construction 138 100 280 195
Income before income taxes 7,232 7,079 11,635 13,757
Income taxes 1,819 2,679 2,903 5,243
Net income 5,413 4,400 8,732 8,514
Preferred stock dividends of subsidiaries 96 96 191 191
Net income attributable to Hawaiian Electric 5,317 4,304 8,541 8,323
Preferred stock dividends of Hawaiian Electric 0 0 0 0
Net income for common stock 5,317 4,304 8,541 8,323
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
Less: 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 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 608,126 556,875 1,178,553 1,075,486
Expenses        
Fuel oil 171,717 141,259 338,685 285,529
Purchased power 160,738 153,067 300,648 280,191
Other operation and maintenance 112,642 104,939 220,252 203,756
Depreciation 50,361 48,156 100,827 96,372
Taxes, other than income taxes 57,524 52,972 111,628 102,795
Total expenses 552,982 500,393 1,072,040 968,643
Total operating income 55,144 56,482 106,513 106,843
Allowance for equity funds used during construction 2,983 3,027 6,277 5,426
Equity in earnings of subsidiaries 0 0 0 0
Less: Retirement defined benefits expense—other than service costs (988) (1,435) (2,252) (2,858)
Interest expense and other charges, net (18,160) (18,214) (35,854) (35,718)
Allowance for borrowed funds used during construction 1,365 1,143 2,809 2,032
Income before income taxes 40,344 41,003 77,493 75,725
Income taxes 8,676 14,860 17,851 27,618
Net income 31,668 26,143 59,642 48,107
Preferred stock dividends of subsidiaries 229 229 458 458
Net income attributable to Hawaiian Electric 31,439 25,914 59,184 47,649
Preferred stock dividends of Hawaiian Electric 270 270 540 540
Net income for common stock $ 31,169 $ 25,644 $ 58,644 $ 47,109