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Electric utility segment - Major Customers (Details) - Various federal government agencies - Operating revenues - Customer concentration - Hawaiian Electric Company, Inc. and Subsidiaries - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Major customers
Operating revenues percentage	11.00%	11.00%	12.00%
Operating revenues amount	$ 344	$ 369	$ 376

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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