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Credit agreement and changes in long-term debt - (Details 2) - HECO (USD $) | 1 Months Ended |
--- | --- | ---
Apr. 30, 2012 | Apr. 19, 2012
Long-term debt |  |
Notes issued through private placement | $ 417,000,000 |
Percentage of ownership interest by HEI below which holders are required to offer to prepay notes | 100.00% |
Number of consecutive days during which investment grade rating is to be maintained | 90 |
Number of rating agencies | 1 |
Unsecured senior notes | HECO |  |
Long-term debt |  |
Notes issued through private placement | 327,000,000 |
Unsecured senior notes | HELCO |  |
Long-term debt |  |
Notes issued through private placement | 31,000,000 |
Unsecured senior notes | MECO |  |
Long-term debt |  |
Notes issued through private placement | 59,000,000 |
3.79%, series 2012A, due 2018 | HECO |  |
Long-term debt |  |
Notes issued through private placement | 30,000,000 |
Interest rate (as a percent) |  | 3.79%
3.79%, series 2012A, due 2018 | HELCO |  |
Long-term debt |  |
Notes issued through private placement | 11,000,000 |
Interest rate (as a percent) |  | 3.79%
3.79%, series 2012A, due 2018 | MECO |  |
Long-term debt |  |
Notes issued through private placement | 9,000,000 |
Interest rate (as a percent) |  | 3.79%
4.03%, series 2012B, due 2020 | HECO |  |
Long-term debt |  |
Notes issued through private placement | 62,000,000 |
Interest rate (as a percent) |  | 4.03%
4.03%, series 2012B, due 2020 | MECO |  |
Long-term debt |  |
Notes issued through private placement | 20,000,000 |
Interest rate (as a percent) |  | 4.03%
4.55%, series 2012C, due 2023 | HECO |  |
Long-term debt |  |
Notes issued through private placement | 50,000,000 |
Interest rate (as a percent) |  | 4.55%
4.55%, series 2012C, due 2023 | MECO |  |
Long-term debt |  |
Notes issued through private placement | 30,000,000 |
Interest rate (as a percent) |  | 4.55%
4.55%, series 2012B, due 2023 | HELCO |  |
Long-term debt |  |
Notes issued through private placement | 20,000,000 |
Interest rate (as a percent) |  | 4.55%
4.72%, series 2012D, due 2029 | HECO |  |
Long-term debt |  |
Notes issued through private placement | 35,000,000 |
Interest rate (as a percent) |  | 4.72%
5.39%, series 2012E, due 2042 | HECO |  |
Long-term debt |  |
Notes issued through private placement | 150,000,000 |
Interest rate (as a percent) |  | 5.39%
Special purpose revenue bonds |  |
Long-term debt |  |
Amount of bonds to be redeemed or refunded | 267,000,000 |
Aggregate principal amount |  | 271,000,000
Special purpose revenue bonds | Minimum |  |
Long-term debt |  |
Interest rate (as a percent) |  | 5.45%
Special purpose revenue bonds | Maximum |  |
Long-term debt |  |
Interest rate (as a percent) |  | 6.20%

X
- Definition This element represents the number of consecutive days after the cessation of ownership interest of the specified percentage by parent, during which the investment grade rating is required to be maintained. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of rating agencies with whom the investment grade rating for unenhanced debt is to be maintained for the specified period. + References No definition available. + Details
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Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
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Period Type: | duration

X
- Definition This element represents the percentage of ownership interest by parent. In the event that the parent ceases to own this specified percentage, the holders of the notes are required to offer to prepay the notes. + References No definition available. + Details
Name: | he_PercentageOfOwnershipInterestByParentBelowWhichHoldersAreRequiredToOfferToPrepayNotes
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Increase for additional borrowings on the debt instrument during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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Balance Type: | credit
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- Definition Interest rate stated in the contractual 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 + Details
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- Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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