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Bank segment (Details 11) (Land loans)	9 Months Ended
	Sep. 30, 2014
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

- Details

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