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Bank segment (HEI only) - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 1988
Hawaiian Electric (parent only)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid	$ 145.0	$ 157.0	$ 154.0
Hawaiian Electric (parent only) | Consolidated subsidiary | American Savings Bank (ASB) | Management and administrative services
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Revenue from related party	2.3	2.3	$ 2.2
Hawaiian Electric (parent only) | Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Obligation to contribute additional capital under the Capital Maintenance Agreement				$ 65.1
Reduction in obligation to contribute additional capital under the Capital Maintenance Agreement	28.3
American Savings Bank (ASB)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash dividends paid	$ 31.0	$ 56.0

X

- Definition

Represent the amount of maximum obligation to contribute additional capital under the Capital Maintenance Agreement.

+ References

No definition available.

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- Definition

Represent the remaining amount of maximum obligation to contribute additional capital under the Capital Maintenance Agreement.

+ References

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- Definition

This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

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- Definition

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.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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