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Credit agreements and long-term debt (Details) |  |  | 1 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2016 | Mar. 23, 2016 USD ($) | Jan. 31, 2015 | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Mar. 24, 2016 USD ($) | Mar. 21, 2016 USD ($) | Apr. 02, 2014 USD ($) Institution | Apr. 01, 2014 USD ($)
Credit agreement |  |  |  |  |  |  |  |  |
Number of financial institutions | Institution |  |  |  |  |  |  |  | 9 |
Actual capitalization ratio (as a percent) |  |  |  | 16.00% |  |  |  |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  |  |  |  |  |  | 65.00% |
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) |  |  |  | 56.00% |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 75,000,000 | $ 0 |  |  |  |
HELCO |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 41.00% |  |  |  |  |
Maui Electric |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 41.00% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  |  |  |  |  |  |  | 50.00% |
Line of credit facility |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  |  |  |  |  |  | $ 150,000,000 | $ 125,000,000
Line of credit facility | Bank Of American Term Loan Expiring March 23, 2018 |  |  |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 75,000,000 |  |
Line of credit facility | Eurodollar term loan |  |  |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  | $ 75,000,000 |  |  |  |  |  |  |
Initial interest rate |  | 1.18% |  |  |  |  |  |  |
Subsequent interest rate |  | 1.19% |  |  |  |  |  |  |
Line of credit facility | Hawaiian Electric Company |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  |  |  |  |  |  | $ 200,000,000 | $ 175,000,000
Unused capacity commitment fee |  |  | 0.20% |  |  |  |  |  |
Line of credit facility | Adjusted LIBOR Rate | Hawaiian Electric Company |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.375% |  |  |  |  |  |
Senior Notes | Senior Notes, 4.41% |  |  |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 75,000,000 |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  | 4.41% |  |  |
Subsequent Event | Line of credit facility |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Unused capacity commitment fee | 0.20% |  |  |  |  |  |  |  |
Subsequent Event | Line of credit facility | Adjusted LIBOR Rate |  |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.375% |  |  |  |  |  |  |  |

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- 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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- 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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- 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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- 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 + Details
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