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Electric utility subsidiary - Taxes (Details) (Hawaiian Electric Company, Inc. and Subsidiaries, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Hawaiian Electric Company, Inc. and Subsidiaries
Revenue taxes
Revenue taxes included in Operating revenues	$ 74	$ 69	$ 203	$ 198
Revenue taxes included as expense in Taxes, other than income taxes	$ 74	$ 69	$ 203	$ 198

X

- Definition

Discloses the amount included as operating expenses for the period related to revenues taxes, which is included in Taxes, other than income taxes.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Discloses the amount included in operating revenues for the period related to revenues taxes.

+ References

No definition available.

+ Details

Name:	he_OperatingRevenuesTaxes
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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Namespace Prefix:	he_
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Balance Type:	na
Period Type:	duration