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Short-term borrowings (Details) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 06, 2017 USD ($) | Dec. 31, 2017 USD ($) instrument Institution | Dec. 31, 2017 USD ($) Institution | Nov. 30, 2017 USD ($) | Nov. 20, 2017 USD ($) | Dec. 31, 2016 USD ($)
Short-term borrowings |  |  |  |  |  |
Outstanding amount |  | $ 117,945,000 | $ 117,945,000 |  |  | $ 0
Line of credit facility | Hamakua Energy Partners, L.P. (HEP) |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Maximum capacity under syndicated credit facilities |  | $ 6,700,000 | $ 6,700,000 |  |  |
Number of letters of credit entered into during the period | instrument |  | 3 |  |  |  |
Eurodollar Term Loan | Unsecured Debt |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Debt instrument term | 364 days |  |  |  |  |
Proceeds from issuance of debt | $ 125,000,000 |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 125,000,000 |
Aggregate repurchased principal amount | $ 125,000,000 |  |  |  |  |
Eurodollar Term Loan | Line of credit facility | Minimum |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Subsequent interest rate | 1.99% |  |  |  |  |
Eurodollar Term Loan | Line of credit facility | Maximum |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Subsequent interest rate | 2.14% |  |  |  |  |
Bank of American Term Loan | Line of credit facility |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Debt instrument, face amount | $ 125,000,000 |  |  |  |  |
Aggregate repurchased principal amount |  |  |  | $ 75,000,000 |  |
Bank of America Loan Agreement |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 150,000,000 |
HEI |  |  |  |  |  |
Credit agreements |  |  |  |  |  |
Number of financial institutions | Institution |  | 8 | 8 |  |  |
HEI | Maximum |  |  |  |  |  |
Credit agreements |  |  |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant |  | 50.00% | 50.00% |  |  |
HEI | Line of credit facility |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Maximum capacity under syndicated credit facilities |  | $ 150,000,000 | $ 150,000,000 |  |  |
Long-term line of credit |  | 0 | $ 0 |  |  | 0
Credit agreements |  |  |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) |  |  | 0.20% |  |  |
HEI | Line of credit facility | Adjusted LIBO Rate |  |  |  |  |  |
Credit agreements |  |  |  |  |  |
Line of credit facility basis point spread |  |  | 1.375% |  |  |
HEI | Commercial paper |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Outstanding amount |  | $ 63,000,000 | $ 63,000,000 |  |  | 0
Weighted-average interest rate |  | 2.50% | 2.50% |  |  |
Hawaiian Electric Company, Inc (HECO) |  |  |  |  |  |
Credit agreements |  |  |  |  |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant |  | 65.00% | 65.00% |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant |  | 35.00% | 35.00% |  |  |
Hawaiian Electric Company, Inc (HECO) | Line of credit facility |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Outstanding amount |  |  |  |  |  | 0
Maximum capacity under syndicated credit facilities |  | $ 200,000,000 | $ 200,000,000 |  |  |
Long-term line of credit |  | 0 | $ 0 |  |  | $ 0
Credit agreements |  |  |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) |  |  | 0.20% |  |  |
Hawaiian Electric Company, Inc (HECO) | Line of credit facility | Adjusted LIBO Rate |  |  |  |  |  |
Credit agreements |  |  |  |  |  |
Line of credit facility basis point spread |  |  | 1.375% |  |  |
Hawaiian Electric Company, Inc (HECO) | Commercial paper |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |
Outstanding amount |  | $ 5,000,000 | $ 5,000,000 |  |  |
Weighted-average interest rate |  | 2.30% | 2.30% |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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