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Electric utility segment - Condensed Consolidating Statement of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | $ (104,402) | $ (1,295,484) | $ 42,122 | $ 41,118 | $ 54,610 | $ 54,721 | $ (1,357,764) | $ 150,449
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | (1,244) |  |  | (446) |  |  | (2,138) | (1,160)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 1,333 |  |  | 470 |  |  | 2,251 | 1,321
Other comprehensive income (loss), net of taxes | 39,360 | 1,594 | (9,801) | (34,875) | (7,609) | 20,488 | 31,153 | (21,996)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | (65,042) |  |  | 6,243 |  |  | (1,326,611) | 128,453
Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | (82,585) | (1,229,394) | 39,221 | 43,461 | 45,299 | 47,009 | (1,272,758) | 135,769
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | (1,331) |  |  | (547) |  |  | (2,344) | (1,487)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 1,333 |  |  | 470 |  |  | 2,251 | 1,321
Other comprehensive income (loss), net of taxes | 2 | $ (46) | $ (49) | (77) | $ (44) | $ (45) | (93) | (166)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | (82,583) |  |  | 43,384 |  |  | (1,272,851) | 135,603
Consolidating adjustments | Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | 18,558 |  |  | (3,005) |  |  | 258,633 | (25,960)
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | 111 |  |  | 126 |  |  | 304 | 366
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | (106) |  |  | (117) |  |  | (275) | (334)
Other comprehensive income (loss), net of taxes | 5 |  |  | 9 |  |  | 29 | 32
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | 18,563 |  |  | (2,996) |  |  | 258,662 | (25,928)
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | (82,585) |  |  | 43,461 |  |  | (1,272,758) | 135,769
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | (1,331) |  |  | (547) |  |  | (2,344) | (1,487)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 1,333 |  |  | 470 |  |  | 2,251 | 1,321
Other comprehensive income (loss), net of taxes | 2 |  |  | (77) |  |  | (93) | (166)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | (82,583) |  |  | 43,384 |  |  | (1,272,851) | 135,603
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | (7,175) |  |  | 7,419 |  |  | (123,080) | 20,884
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | (40) |  |  | (55) |  |  | (117) | (166)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 42 |  |  | 54 |  |  | 112 | 157
Other comprehensive income (loss), net of taxes | 2 |  |  | (1) |  |  | (5) | (9)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | (7,173) |  |  | 7,418 |  |  | (123,085) | 20,875
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | (12,807) |  |  | (4,414) |  |  | (136,977) | 5,076
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | (71) |  |  | (71) |  |  | (187) | (200)
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 64 |  |  | 63 |  |  | 163 | 177
Other comprehensive income (loss), net of taxes | (7) |  |  | (8) |  |  | (24) | (23)
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | (12,814) |  |  | (4,422) |  |  | (137,001) | 5,053
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) for common stock | 1,424 |  |  | 0 |  |  | 1,424 | 0
Retirement benefit plans: |  |  |  |  |  |  |  |
Adjustment for amortization of prior service credit and net gains recognized during the period in net periodic benefit cost, net of taxes of $(431), $(153), $(740) and $(397), respectively | 0 |  |  | 0 |  |  | 0 | 0
Reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, net of taxes | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income (loss), net of taxes | 0 |  |  | 0 |  |  | 0 | 0
Comprehensive income (loss) attributable to Hawaiian Electric Industries, Inc. | $ 1,424 |  |  | $ 0 |  |  | $ 1,424 | $ 0

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