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Credit agreement and long-term debt (Details) (USD $)	9 Months Ended						0 Months Ended		0 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Apr. 02, 2014 Institution	Sep. 30, 2014 Maximum	Sep. 30, 2014 HELCO	Sep. 30, 2014 Maui Electric	Apr. 02, 2014 Line of credit facility	Mar. 31, 2014 Line of credit facility	Apr. 02, 2014 Line of credit facility Hawaiian Electric Company	Mar. 31, 2014 Line of credit facility Hawaiian Electric Company	May 02, 2014 Eurodollar term loan Loans payable	May 05, 2014 Medium-term Notes 6.51 Percent Due 2014 Medium-term note	Apr. 02, 2014 Adjusted LIBO Rate Line of credit facility	Apr. 02, 2014 Adjusted LIBO Rate Line of credit facility Hawaiian Electric Company
Credit agreement
Number of financial institutions			9
Revolving noncollateralized credit facility with a letter of credit sub-facility							$ 150,000,000	$ 125,000,000	$ 200,000,000	$ 175,000,000
Basis spread on variable rate													1.375%	1.25%
Unused capacity commitment fee							0.20%		0.175%
Capitalization ratio required to be maintained as per the debt covenant (as a percent)				50.00%
Actual capitalization ratio (as a percent)	17.00%
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent)	65.00%
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent)					41.00%	43.00%
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent)	35.00%
Actual ratio of consolidated debt to total consolidated capitalization (as a percent)	55.00%
Changes in long-term debt
Long-term debt	125,000,000	50,000,000									125,000,000
Term of loan											2 years
Initial interest rate for initial period											1.12%
Repayments of debt												$ 100,000,000
Debt instrument, stated interest rate (as a percent)												6.51%

X

- Definition

Represents the consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

The actual consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Represents the consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

The actual consolidated subsidiary debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Represents the nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Represents the actual nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of financial institutions with which the entity entered into a revolving Non Collateralized credit agreement with a letter of credit sub-facility.

+ References

No definition available.

+ Details

Name:	he_NumberOfFinancialInstitutions
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X

- Definition

Term of loan.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
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X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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- Details

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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