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Credit agreement and changes in long-term debt - (Details 2) - HECO (USD $) | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 0 Months Ended
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Apr. 30, 2012 D agency | Apr. 30, 2012 Unsecured senior notes HECO | Apr. 30, 2012 Unsecured senior notes HELCO | Apr. 30, 2012 Unsecured senior notes MECO | Apr. 30, 2012 3.79%, series 2012A, due 2018 HECO | Apr. 19, 2012 3.79%, series 2012A, due 2018 HECO | Apr. 30, 2012 3.79%, series 2012A, due 2018 HELCO | Apr. 19, 2012 3.79%, series 2012A, due 2018 HELCO | Apr. 30, 2012 3.79%, series 2012A, due 2018 MECO | Apr. 19, 2012 3.79%, series 2012A, due 2018 MECO | Apr. 30, 2012 4.03%, series 2012B, due 2020 HECO | Apr. 19, 2012 4.03%, series 2012B, due 2020 HECO | Apr. 30, 2012 4.03%, series 2012B, due 2020 MECO | Apr. 19, 2012 4.03%, series 2012B, due 2020 MECO | Apr. 30, 2012 4.55%, series 2012C, due 2023 HECO | Apr. 19, 2012 4.55%, series 2012C, due 2023 HECO | Apr. 30, 2012 4.55%, series 2012C, due 2023 MECO | Apr. 19, 2012 4.55%, series 2012C, due 2023 MECO | Apr. 30, 2012 4.55%, series 2012B, due 2023 HELCO | Apr. 19, 2012 4.55%, series 2012B, due 2023 HELCO | Apr. 30, 2012 4.72%, series 2012D, due 2029 HECO | Apr. 19, 2012 4.72%, series 2012D, due 2029 HECO | Apr. 30, 2012 5.39%, series 2012E, due 2042 HECO | Apr. 19, 2012 5.39%, series 2012E, due 2042 HECO | Apr. 30, 2012 Special purpose revenue bonds | Apr. 19, 2012 Special purpose revenue bonds | Apr. 19, 2012 Special purpose revenue bonds Minimum | Apr. 19, 2012 Special purpose revenue bonds Maximum | Sep. 13, 2012 4.53%, Series 2012F, due 2032 HECO | Sep. 13, 2012 5.10%, Series 2002A, due 2032 HECO
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued through private placement | $ 417,000,000 | $ 327,000,000 | $ 31,000,000 | $ 59,000,000 | $ 30,000,000 |  | $ 11,000,000 |  | $ 9,000,000 |  | $ 62,000,000 |  | $ 20,000,000 |  | $ 50,000,000 |  | $ 30,000,000 |  | $ 20,000,000 |  | $ 35,000,000 |  | $ 150,000,000 |  |  |  |  |  | $ 40,000,000 | $ 40,000,000
Interest rate (as a percent) |  |  |  |  |  | 3.79% |  | 3.79% |  | 3.79% |  | 4.03% |  | 4.03% |  | 4.55% |  | 4.55% |  | 4.55% |  | 4.72% |  | 5.39% |  |  | 5.45% | 6.20% | 4.53% | 5.10%
Amount of bonds to be redeemed or refunded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 267,000,000 |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 271,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- 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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- 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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- 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
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- 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 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 FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: 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. + Details
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