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Electric utility segment - 2014 Agreement (Details) - order	1 Months Ended	12 Months Ended
	Apr. 30, 2014	Dec. 31, 2016
Regulatory projects and legal obligations
Number of orders from regulatory agency	4
MECO
Regulatory projects and legal obligations
Period to file required plan		120 days

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- Definition

Public Utilities Orders from Regulatory Agency Number

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+ Details

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X

- Definition

Public Utilities, Regulatory Filing Period

+ References

No definition available.

+ Details

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- Definition

-- None. No documentation exists for this element. --

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No definition available.

+ Details

Name:	he_RegulatoryProjectsAndLegalObligationsLineItems
Namespace Prefix:	he_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=he_SubsidiariesThreeMember
Namespace Prefix:
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Period Type: