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Electric utility subsidiary - Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Hawaiian Electric Company, Inc. and Subsidiaries
Revenue taxes
Electric Utility Revenue Taxes Included in Operating Revenues and in Taxes Other than Income Taxes Expense	$ 51	$ 65

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- Definition

Represents the utility revenue taxes included in operating revenues and in taxes, other than income taxes expense.

+ References

No definition available.

+ Details

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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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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

Name:	dei_LegalEntityAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix:
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Balance Type:
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