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Electric utility segment - Purchases from IPPs (Details) - Hawaiian Electric, Parent - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	$ 175	$ 181	$ 322	$ 341
Kalaeloa Partners, L.P.
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	69	79	128	145
HPOWER
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	20	16	39	33
Puna Geothermal Venture
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	6	14	19	27
Hamakua Energy
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	8	5	13	16
Kapolei Energy Storage
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	6	6	12	12
Wind IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	36	37	57	67
Solar IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	29	21	51	36
Other IPPs
Regulatory Projects and Legal Obligations [Line Items]
Purchased power	$ 1	$ 3	$ 3	$ 5

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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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