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Electric utility segment - Purchases from IPPs (Details) - Hawaiian Electric, Parent - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 189 | $ 178 | $ 530 | $ 499
Kalaeloa |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 74 | 77 | 219 | 211
HPOWER |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 20 | 17 | 53 | 51
Puna Geothermal Venture |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 15 | 7 | 42 | 24
Hamakua Energy |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 9 | 13 | 25 | 52
Kapolei Energy Storage |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 6 | 0 | 18 | 0
Wind IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 37 | 42 | 104 | 99
Solar IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | 26 | 21 | 62 | 57
Other IPPs |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |
Purchased power | $ 2 | $ 1 | $ 7 | $ 5

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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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