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Credit agreements and long-term debt (Details) |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May. 05, 2014 USD ($) | May. 02, 2014 USD ($) | Apr. 02, 2014 USD ($) Institution | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Oct. 15, 2015 USD ($) | 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 |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 0 | $ 125,000,000 |  |
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
Unused capacity commitment fee |  |  | 0.20% |  |  |  |
Line of credit facility | Adjusted LIBOR Rate |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.375% |  |  |  |
Eurodollar term loan | Loans payable |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Long-term debt |  | $ 125,000,000 |  |  |  |  |
Term of loan |  | 2 years |  |  |  |  |
Eurodollar term loan | Loans payable | Minimum |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Initial interest rate for initial period |  | 1.09% |  |  |  |  |
Eurodollar term loan | Loans payable | Maximum |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Initial interest rate for initial period |  | 1.18% |  |  |  |  |
Medium-term Notes 6.51 Percent Due 2014 | Medium-term note |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Repayments of debt | $ 100,000,000 |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) | 6.51% |  |  |  |  |  |
Senior Notes, 5.23% | Secured Debt | Subsequent Event |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  | 5.23% |
Hawaiian Electric Company | Line of credit facility |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  |  | $ 200,000,000 |  |  |  | $ 175,000,000
Unused capacity commitment fee |  |  | 0.175% |  |  |  |
Hawaiian Electric Company | Line of credit facility | Adjusted LIBOR Rate |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.25% |  |  |  |
Hawaiian Electric Company | Senior Notes, 5.23% | Secured Debt | Subsequent Event |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 50,000,000 |
HELCO |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 41.00% |  |  |
HELCO | Senior Notes, 5.23% | Secured Debt | Subsequent Event |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  | 5.23% |
Debt instrument, face amount |  |  |  |  |  | $ 25,000,000 |
Maui Electric |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  | 41.00% |  |  |
Maui Electric | Senior Notes, 5.23% | Secured Debt | Subsequent Event |  |  |  |  |  |  |
Changes in long-term debt |  |  |  |  |  |  |
Debt instrument, stated interest rate (as a percent) |  |  |  |  |  | 5.23% |
Debt instrument, face amount |  |  |  |  |  | $ 5,000,000 |

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