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Credit agreements and long-term debt (Details) | Jun. 29, 2017 USD ($) | Jun. 30, 2017 USD ($) Institution | Dec. 31, 2016 USD ($)
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Credit agreement |  |  |
Number of financial institutions (in institutions) | Institution |  | 8 |
Line of credit facility |  |  |
Credit agreement |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  | $ 150,000,000 |
Amount outstanding under facilities |  | 0 | $ 0
Line of credit facility | Hawaiian Electric Company |  |  |
Credit agreement |  |  |
Revolving noncollateralized credit facility with a letter of credit sub-facility |  | 200,000,000 |
Amount outstanding under facilities |  | $ 0 | $ 0
Special Purpose Revenue Bonds | Refunding Series 2017A Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Aggregate principal amount | $ 125,000,000 |  |
Fixed coupon interest rate | 3.10% |  |
Special Purpose Revenue Bonds | Refunding Series 2017B Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Aggregate principal amount | $ 140,000,000 |  |
Fixed coupon interest rate | 4.00% |  |
Special Purpose Revenue Bonds | Refunding Series 2007B Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Fixed coupon interest rate | 4.60% |  |
Aggregate principal amount | $ 125,000,000 |  |
Special Purpose Revenue Bonds | Series 2007A Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Fixed coupon interest rate | 4.65% |  |
Aggregate principal amount | $ 140,000,000 |  |
Special Purpose Revenue Bonds | Hawaiian Electric Company | Refunding Series 2017A Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | 62,000,000 |  |
Special Purpose Revenue Bonds | Hawaiian Electric Company | Refunding Series 2017B Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | 100,000,000 |  |
Special Purpose Revenue Bonds | HELCO | Refunding Series 2017A Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | 8,000,000 |  |
Special Purpose Revenue Bonds | HELCO | Refunding Series 2017B Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | 20,000,000 |  |
Special Purpose Revenue Bonds | Maui Electric | Refunding Series 2017A Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | 55,000,000 |  |
Special Purpose Revenue Bonds | Maui Electric | Refunding Series 2017B Special Purpose Revenue Bonds |  |  |
Credit agreement |  |  |
Proceeds from Department loan | $ 20,000,000 |  |

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- Definition Represents the number of financial institutions with which the entity entered into a revolving Non Collateralized credit agreement with a letter of credit sub-facility. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + 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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- Definition The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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