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Regulatory restrictions on net assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory restrictions on net assets
Restrictions on transfer of net assets to the parent in the form of cash dividends, loans and advances	$ 668us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = he_HawaiianElectricCompanyAndSubsidiariesMember
American Savings Bank (ASB)
Regulatory restrictions on net assets
Amount of net assets available for transfer	$ 103he_AmountOfNetAssetsAvailableForTransfer / us-gaap_StatementBusinessSegmentsAxis = he_AmericanSavingsBankFSBMember

X

- Definition

Represents the amount of net assets that are available for transfer in the form of dividends to the parent company while maintaining a "well-capitalized" position.

+ References

No definition available.

+ Details

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X

- Details

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X

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(e)(3)(ii))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph e

-Subparagraph 3

-Article 4

+ Details

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- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
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