XML 90 R78.htm IDEA: XBRL DOCUMENT v3.22.2

Interest rate swaps - Interest rate derivatives (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Interest Rate Swap Matured On 11/21/2027
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 50.0
Fixed interest rate	2.75%
Asset (liability)	$ (0.1)	$ 0.0
Interest Rate Swap Matured On 11/21/2029
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 50.0
Fixed interest rate	2.78%
Asset (liability)	$ (0.1)	0.0
Interest Rate Swap Matured On 09/01/2035
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	24.0
Asset (liability)	$ (0.6)	(5.3)
Interest Rate Swap Matured On 09/01/2035 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate	4.88%
Interest Rate Swap Matured On 09/01/2035 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate	5.05%
Interest Rate Swap Matured On 10/01/2031
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 13.0
Fixed interest rate	2.79%
Asset (liability)	$ 1.0	$ 0.3

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126966630&loc=d3e41228-113958

+ Details

Name:	us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=he_InterestRateSwapMaturingNovember212027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=he_InterestRateSwapMaturingNovember212029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=he_InterestRateSwapMaturingSeptember012035Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=he_InterestRateSwapMaturingOctober012031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: