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Electric utility segment - Purchases from IPPs (Details) - Hawaiian Electric, Parent - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | $ 160 | $ 153
Kalaeloa |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 66 | 67
HPOWER |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 17 | 18
Puna Geothermal Venture |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 13 | 8
Hamakua Energy |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 11 | 20
Kapolei Energy Storage |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 6 | 0
Wind IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 30 | 24
Solar IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 15 | 14
Other IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power |  | $ 2
Other Independent Power Producers, Including Netting |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | $ 2 |

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- Definition Amount of operating expense for purchased power of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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