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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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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

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