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Fair value measurements (Details) - HECO (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying or notional amount |  |
Financial liabilities |  |
Long-term debt, net, including amounts due within one year | $ 1,422,877 | $ 1,422,872
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries | Fair value measurements on a recurring basis |  |
Financial liabilities |  |
Short-term borrowings - nonaffiliates | 53,992 |
Long-term debt, net, including amounts due within one year | 1,147,877 | 1,147,872
Estimated fair value |  |
Financial liabilities |  |
Long-term debt, net, including amounts due within one year | 1,450,844 | 1,481,004
Estimated fair value | Level 2 |  |
Financial liabilities |  |
Long-term debt, net, including amounts due within one year | 1,450,844 | 1,481,004
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries | Level 2 | Fair value measurements on a recurring basis |  |
Financial liabilities |  |
Short-term borrowings - nonaffiliates | 53,992 |
Long-term debt, net, including amounts due within one year | $ 1,164,470 | $ 1,181,631

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- Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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