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Electric utility segment - Purchases from IPPs (Details) - Hawaiian Electric, Parent - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | $ 147 | $ 160
Kalaeloa Partners, L.P. |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 59 | 66
HPOWER |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 19 | 17
Puna Geothermal Venture |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 13 | 13
Hamakua Energy |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 5 | 11
Kapolei Energy Storage |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 6 | 6
Wind IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 21 | 30
Solar IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | 22 | 15
Other IPPs |  |
Regulatory Projects and Legal Obligations [Line Items] |  |
Purchased power | $ 2 | $ 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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