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Summary of significant accounting policies - Changes In Accounting Standard Updates (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | $ 2,527,493 | $ 2,209,392 | $ 2,024,816
Operating income | $ 84,604 | $ 98,064 | $ 78,799 | $ 71,889 | $ 87,220 | $ 111,473 | $ 77,802 | $ 69,738 | 333,356 | 346,233 | 355,838
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (5,962) | (7,942) | (7,663)
Electric utility |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 2,304,864 | 1,994,042 | 1,804,298
Operating income |  |  |  |  |  |  |  |  | 241,661 | 263,524 | 290,070
Bank |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 206,040 | 198,104 | 197,697
Operating income |  |  |  |  |  |  |  |  | 108,235 | 99,536 | 88,227
Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 16,589 | 17,246 | 22,821
Operating income |  |  |  |  |  |  |  |  | (16,540) | (16,827) | (22,459)
As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 2,217,334 | 2,032,479
Operating income |  |  |  |  |  |  |  |  |  | 338,291 | 348,175
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | 0 | 0
As previously filed | Electric utility |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 2,000,045 | 1,809,900
Operating income |  |  |  |  |  |  |  |  |  | 257,521 | 284,468
As previously filed | Bank |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 198,924 | 198,572
Operating income |  |  |  |  |  |  |  |  |  | 98,716 | 87,352
As previously filed | Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 18,365 | 24,007
Operating income |  |  |  |  |  |  |  |  |  | (17,946) | (23,645)
ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (7,942) | (7,663)
Operating income |  |  |  |  |  |  |  |  |  | 7,942 | 7,663
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (7,942) | (7,663)
ASU 2017-07 | Adjustment | Electric utility |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (6,003) | (5,602)
Operating income |  |  |  |  |  |  |  |  |  | 6,003 | 5,602
ASU 2017-07 | Adjustment | Bank |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (820) | (875)
Operating income |  |  |  |  |  |  |  |  |  | 820 | 875
ASU 2017-07 | Adjustment | Other |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (1,119) | (1,186)
Operating income |  |  |  |  |  |  |  |  |  | 1,119 | 1,186
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 2,304,864 | 1,994,042 | 1,804,298
Operating income | $ 61,112 | $ 74,036 | $ 55,144 | $ 51,369 | $ 68,184 | $ 88,497 | $ 56,482 | $ 50,361 | 241,661 | 263,524 | 290,070
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (3,631) | (6,003) | (5,602)
Other operation and maintenance |  |  |  |  |  |  |  |  | 461,491 | 411,907 | 399,931
Hawaiian Electric Company, Inc. and Subsidiaries | As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 2,000,045 | 1,809,900
Operating income |  |  |  |  |  |  |  |  |  | 257,521 | 284,468
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | 0 | 0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 417,910 | 405,533
Hawaiian Electric Company, Inc. and Subsidiaries | ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (6,003) | (5,602)
Operating income |  |  |  |  |  |  |  |  |  | 6,003 | 5,602
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (6,003) | (5,602)
Other operation and maintenance |  |  |  |  |  |  |  |  |  | (6,003) | (5,602)
Hawaiian Electric |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 1,639,275 | 1,420,606 | 1,272,187
Operating income |  |  |  |  |  |  |  |  | 163,275 | 177,898 | 202,197
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (2,649) | (5,049) | (5,058)
Other operation and maintenance |  |  |  |  |  |  |  |  | 313,346 | 274,391 | 268,118
Hawaiian Electric | As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 1,425,655 | 1,277,245
Operating income |  |  |  |  |  |  |  |  |  | 172,849 | 197,139
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | 0 | 0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 279,440 | 273,176
Hawaiian Electric | ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (5,049) | (5,058)
Operating income |  |  |  |  |  |  |  |  |  | 5,049 | 5,058
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (5,049) | (5,058)
Other operation and maintenance |  |  |  |  |  |  |  |  |  | (5,049) | (5,058)
HELCO |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 287,775 | 267,142
Operating income |  |  |  |  |  |  |  |  |  | 45,692 | 44,243
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (93) | 319
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 66,184 | 64,216
HELCO | As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 287,868 | 266,823
Operating income |  |  |  |  |  |  |  |  |  | 45,599 | 44,562
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | 0 | 0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 66,277 | 63,897
HELCO | ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (93) | 319
Operating income |  |  |  |  |  |  |  |  |  | 93 | (319)
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (93) | 319
Other operation and maintenance |  |  |  |  |  |  |  |  |  | (93) | 319
MECO |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 285,661 | 264,969
Operating income |  |  |  |  |  |  |  |  |  | 40,017 | 43,736
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (861) | (863)
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 71,332 | 67,597
MECO | As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | 286,522 | 265,832
Operating income |  |  |  |  |  |  |  |  |  | 39,156 | 42,873
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | 0 | 0
Other operation and maintenance |  |  |  |  |  |  |  |  |  | 72,193 | 68,460
MECO | ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  |  | (861) | (863)
Operating income |  |  |  |  |  |  |  |  |  | 861 | 863
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  |  | (861) | (863)
Other operation and maintenance |  |  |  |  |  |  |  |  |  | (861) | (863)
American Savings Bank (ASB) |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total expenses |  |  |  |  |  |  |  |  | 206,040 | 198,104 | 197,697
Operating income |  |  |  |  |  |  |  |  | 108,235 | 99,536 | 88,227
Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (1,657) | (820) | (875)
Compensation and employee benefits |  |  |  |  |  |  |  |  | 98,387 | 94,931 | 89,242
Other expense |  |  |  |  |  |  |  |  | $ 17,238 | 20,144 | 19,362
American Savings Bank (ASB) | As previously filed |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | 95,751 | 90,117
Other expense |  |  |  |  |  |  |  |  |  | 19,324 | 18,487
American Savings Bank (ASB) | ASU 2017-07 | Adjustment |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | (820) | (875)
Other expense |  |  |  |  |  |  |  |  |  | $ 820 | $ 875

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