XML 99 R81.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Credit agreements and long-term debt (Details) |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 23, 2016 USD ($) | Apr. 02, 2014 USD ($) Institution | Jan. 31, 2015 | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | Mar. 24, 2016 USD ($) | Mar. 21, 2016 USD ($) | Apr. 01, 2014 USD ($)
Credit agreement |  |  |  |  |  |  |  |
Number of financial institutions | Institution |  | 9 |  |  |  |  |  |
Actual capitalization ratio (as a percent) |  |  |  | 17.00% |  |  |  |
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) |  |  |  | 57.00% |  |  |  |
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) |  |  |  | 42.00% |  |  |  |
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
Unused capacity commitment fee |  | 0.20% |  |  |  |  |  |
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% |  |  |  |  |  |  |
Interest rate term | 1 month |  |  |  |  |  |  |
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 |  |  | 0.175% |  |  |  |  |
Line of credit facility | Adjusted LIBOR Rate |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.375% |  |  |  |  |  |
Line of credit facility | Adjusted LIBOR Rate | Hawaiian Electric Company |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.25% |  |  |  |  |
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% |  |

X
- Definition Represents the consolidated debt to total consolidated capitalization ratio which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | he_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatioActual
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | he_DebtInstrumentCovenantConsolidatedSubsidiaryDebtToTotalConsolidatedCapitalizationRatioActual
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantNonconsolidatedCapitalizationRatio
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the actual nonconsolidated capitalization ratio, which the entity is required to maintain pursuant to a debt covenant. + References No definition available. + Details
Name: | he_DebtInstrumentCovenantNonconsolidatedCapitalizationRatioActual
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line Of Credit Facility, Interest Rate For Initial Month + References No definition available. + Details
Name: | he_LineOfCreditFacilityInterestRateForInitialMonth
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line Of Credit Facility, Interest Rate For Subsequent Periods + References No definition available. + Details
Name: | he_LineOfCreditFacilityInterestRateForSubsequentPeriods
Namespace Prefix: | he_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line Of Credit Facility, Subsequent Interest Rate Term + References No definition available. + Details
Name: | he_LineOfCreditFacilitySubsequentInterestRateTerm
Namespace Prefix: | he_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | he_NumberOfFinancialInstitutions
Namespace Prefix: | he_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LongTermDebtAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiiElectricLightCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_MauiElectricCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=he_BankOfAmericanTermLoanExpiringMarch232018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=he_EurodollarTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=he_LondonInterbankOfferingRateLIBORAdjustedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=he_SeniorNotes4.41Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |