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Bank segment (HEI only) - TDR Narrative (Details) - Residential land	12 Months Ended
	Dec. 31, 2017
Troubled debt restructurings
Period of interest-only monthly payment term loan	3 years
Maximum
Troubled debt restructurings
Extension of maturity date	5 years

X

- Definition

Represents the extension of maturity period of troubled debt under the troubled debt restructuring plan.

+ References

No definition available.

+ Details

Name:	he_FinancingReceivableModificationsIncreaseInMaturityPeriod
Namespace Prefix:	he_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period of interest-only monthly payment term loan under the troubled debt restructuring plan.

+ References

No definition available.

+ Details

Name:	he_FinancingReceivableModificationsPeriodOfInterestOnlyMonthlyPaymentTermLoan
Namespace Prefix:	he_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=he_ResidentialLandPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: