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Unconsolidated variable interest entities (Details) - HECO (USD $) | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |  |
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Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries kilowatt item | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries AES Hawaii, Inc. (AES Hawaii) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Kalaeloa Partners, L.P. (Kalaeloa) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Hamakua Energy Partners, L.P. (HEP) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries HPOWER | Sep. 30, 2012 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2011 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2012 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2011 Hawaii Electric Light Company, Inc. (HELCO) | Sep. 30, 2012 Maui Electric Company, Limited (MECO) | Sep. 30, 2011 Maui Electric Company, Limited (MECO) | Sep. 30, 2012 Maui Electric Company, Limited (MECO) | Sep. 30, 2011 Maui Electric Company, Limited (MECO) | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 HECO Capital Trust III | Sep. 30, 2011 HECO Capital Trust III | Dec. 31, 2011 HECO Capital Trust III | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities item | Sep. 30, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Sep. 30, 2011 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Dec. 31, 2011 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries 2004 Trust Preferred Securities | Sep. 30, 2012 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Sep. 30, 2011 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Dec. 31, 2011 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III Hawaiian Electric Company, Inc. and Subsidiaries Trust Common Securities | Mar. 31, 2004 HECO Capital Trust III Hawaii Electric Light Company, Inc. (HELCO) | Mar. 31, 2004 HECO Capital Trust III Maui Electric Company, Limited (MECO)
Unconsolidated variable interest entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of 2004 Trust Preferred Securities issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |
Dividend rate on 2004 Trust Preferred Securities (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |
Aggregate Liquidation preference |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  | $ 1,500,000 |  |
Principal amount of 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,500,000 |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000
Investment in 2004 Debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,500,000 |  | 51,500,000 |  |  |  |  |  |  |  |  |  |  |
Balance of Trust Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  | 50,000,000 | 1,500,000 |  | 1,500,000 |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividend distributions on Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 2,400,000 |  |  |  |  |  |  |
Common dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 |  |  |  |
Power purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capacity of small power production facilities (in kilowatts) |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of power purchase from AES Hawaii, Inc. (AES Hawaii), Kalaeloa Partners, L.P. (Kalaeloa), Hamakua Energy Partners, L.P. (HEP) and HPOWER |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases from IPPs | $ 135,507,000 | $ 141,742,000 | $ 401,423,000 | $ 386,414,000 | $ 38,000,000 | $ 35,000,000 | $ 109,000,000 | $ 106,000,000 | $ 78,000,000 | $ 87,000,000 | $ 230,000,000 | $ 226,000,000 | $ 19,000,000 | $ 19,000,000 | $ 48,000,000 | $ 44,000,000 | $ 18,000,000 | $ 16,000,000 | $ 48,000,000 | $ 45,000,000 | $ 37,693,000 | $ 38,252,000 | $ 108,996,000 | $ 100,516,000 | $ 13,499,000 | $ 8,490,000 | $ 29,421,000 | $ 21,249,000 | $ 186,699,000 | $ 188,484,000 | $ 539,840,000 | $ 508,179,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Preferred securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) or upon an event that is certain to occur, that are issued by a trust to outside investors where the trust uses the proceeds of the issuance of those securities to purchase an equivalent amount of junior subordinated debentures or other loans having stated maturities. + References No definition available. + Details
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- Definition Maximum capacity of small power production facilities. + References No definition available. + Details
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- Definition Represents the number of firm power purchase agreements entered into, by the company. + References No definition available. + Details
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- Definition Represents the percentage of power purchase from independent power producers of total power purchase capacity. + References No definition available. + Details
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- Definition The value of liquidation preference (or restrictions) of securities that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References No definition available. + Details
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- Definition The amount of interest incurred to a trust which has issued trust-preferred securities. In order to issue trust preferred securities, a sponsor forms a trust by investing a nominal amount of cash to purchase all of the voting common stock of the trust. The trust issues nonvoting, mandatorily redeemable preferred securities to outside investors in exchange for cash. The proceeds received from the issuance of the preferred securities, together with the cash received for issuing the common stock to the sponsor, is then loaned to the sponsor in exchange for a note which has the same terms as the trust preferred securities. Trust preferred securities possesses characteristics of both equity and debt issues and are generally issued by bank holding companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 150 -Paragraph A4 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 55 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6924035&loc=d3e22274-110880 + Details
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- Definition Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The amount of purchased power charged against earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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