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Bank segment (HEI only) - Loans Receivable, Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Bank Segment Disclosure [Abstract]
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required	80.00%
Real estate loans for investors	$ 1,200.0	$ 1,200.0	$ 1,500.0
Loans pledged as collateral to secure advances from the FHLB of Des Moines	2,400.0	2,400.0
Loans to directors, executive directors, affiliates and any related interest of such individuals	23.8	22.9
Loan balances, related interests of individuals who are directors	$ 18.7	$ 19.0

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- Definition

Bank Segment Disclosure [Abstract]

+ References

No definition available.

+ Details

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

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- Definition

Represents the amount of Loan balances, which are related to interests of individuals who are directors of bank.

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No definition available.

+ Details

Name:	he_LoanBalancesRelatedToInterestOfIndividualDirectors
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Represents the amount of Loan balances, which are related to interests of individuals who are directors of bank, executive officers and related interests.

+ References

No definition available.

+ Details

Name:	he_LoanBalancesRelatedToInterestOfIndividualDirectorsExecutiveOfficersAndRelatedInterests
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity.

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No definition available.

+ Details

Name:	he_MinimumBenchmarkPercentageofLoantoAppraisalRatiowhichMortgageInsuranceisRequired
Namespace Prefix:	he_
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- Definition

Real estate loans serviced for investors.

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No definition available.

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Name:	he_RealEstateLoansServicedForInvestors
Namespace Prefix:	he_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5086-111524

+ Details

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Period Type:	instant