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Commitments and contingencies - (Details) - HECO (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |  | 3 Months Ended |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 item | Sep. 30, 2011 | Nov. 01, 2012 Electric utility | Oct. 19, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Jan. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Hawaiian Electric Company, Inc. and Subsidiaries megawatt | Sep. 30, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2018 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2017 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2016 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2015 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2014 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2012 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 MECO | Sep. 30, 2011 MECO | Sep. 30, 2012 MECO | Sep. 30, 2011 MECO | Dec. 31, 2012 MECO | Mar. 31, 2012 MECO | Sep. 30, 2012 Campbell Industrial Park 110MW combustion turbine and transmission line Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 East Oahu transmission project | Dec. 31, 2011 East Oahu transmission project Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 East Oahu Transmission Project Phase 1 | Sep. 30, 2012 East Oahu Transmission Project Phase 1 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 East Oahu Transmission Project Phase 2 | Apr. 30, 2010 East Oahu Transmission Project Phase 2 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 East Oahu Transmission Project Phase 2 Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Customer Information System Project | Dec. 31, 2005 Customer Information System Project Hawaiian Electric Company, Inc. and Subsidiaries | Sep. 30, 2012 Customer Information System Project Hawaiian Electric Company, Inc. and Subsidiaries
Regulatory projects and legal obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred cost to be recovered subject to PUC approval |  |  |  |  |  |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in the asset retirement obligation liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  |  |  |  | 48,630,000 |  |  | 50,871,000 | 48,630,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion expense |  |  |  |  |  |  |  |  |  | 1,233,000 | 1,641,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities settled |  |  |  |  |  |  |  |  |  | (2,788,000) | (681,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revisions in estimated cash flows |  |  |  |  |  |  |  |  |  |  | 390,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of the period |  |  |  |  |  |  |  | 49,316,000 | 49,980,000 | 49,316,000 | 49,980,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration from renewable energy sources (in megawatts) |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collective bargaining agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of employees who are members of the International Brotherhood of Electrical Workers |  |  |  |  | 53.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-compounded wage increase (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% | 3.25% | 3.00% | 3.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional deferred cost to be recovered subject to PUC approval |  |  |  |  |  |  |  |  |  | 555,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum deferred cost recovery |  |  |  |  |  |  |  |  |  | 5,890,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration from firm renewable geothermal dispatchable energy (in megawatts)) |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized with respect to interim rate increase order |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Project cost incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195,000,000 |  |  |  |  |  |  |  |  |  |
Allowance for funds used during construction | (688,000) | (658,000) | (2,451,000) | (1,731,000) |  |  |  | (576,000) | (518,000) | (2,061,000) | (1,338,000) |  |  |  |  |  |  |  |  | (53,000) | (86,000) | (216,000) | (204,000) |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |
Cost of project recoverable from increase in annual revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,000,000 |  |  |  |  |  |  |  |  |  |
Estimated project cost above PUC approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |  |  |  |  |  |  |
Estimated cost of project upon completion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,000,000 |  | 42,000,000 |  | 14,000,000 |  |  |  |  |
Accumulated project cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,000,000 |  |  |  |  |  |
Estimated project cost subject to decision and order issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  |  |
Write-off project cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,500,000 |  |  |  |  |  |
Cost of settlement agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |
Annual increase in cost of settlement agreement, subject to PUC approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Net estimated cost of using smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |
Estimated cost of smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |
Estimated statutory funding for smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Net actual cost of using smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,900,000 |  |  |
Cost of smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,400,000 |  |  |
Statutory funding for smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |  |  |
Expected additional funding for smart grid technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Amount authorized for the project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |
Amount authorized for project attributable to capital and deferred costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
Deferred and capital cost estimate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,000,000
Limitation on deferred project operation and maintenance expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 | 2,300,000 |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |
Environmental regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of steam generating units on the island of Hawaii |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of EGUs impacted by proposed rules of MATS |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reduction in GHG emissions by 2020 |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferral period for GHG permitting requirements for carbon dioxide emissions |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional accrued investigation and estimated cleanup costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  | $ 3,600,000 |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |  |
Period for which operations was stopped prior to merger |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the amount authorized by the appropriate authority for the project. + References No definition available. + Details
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- Definition Represents the amount authorized by the appropriate authority for the project attributable to capital and deferred costs. + References No definition available. + Details
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- Definition Represents the actual cost of project modification. + References No definition available. + Details
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- Definition Represents the actual statutory funding for the project modification through the Smart Grid Investment Grant Program of the American Recovery and Reinvestment Act of 2009. + References No definition available. + Details
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- Definition Represents the estimated cost to complete the project as of balance sheet date. + References No definition available. + Details
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- Definition Represents the cost to the project above the PUC approval. + References No definition available. + Details
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- Definition Represents the estimated cost of project modification. + References No definition available. + Details
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- Definition Represents the estimated statutory funding for the project modification through the Smart Grid Investment Grant Program of the American Recovery and Reinvestment Act of 2009. + References No definition available. + Details
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- Definition Represents the deferral years for GHG permitting requirements for carbon dioxide emissions. + References No definition available. + Details
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- Definition Represents the number of steam generating units. + References No definition available. + Details
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- Definition Represents the percentage of employees of the entity who are members of the International Brotherhood of Electrical Workers, AFL-CIO, Local 1260, Unit 8. + References No definition available. + Details
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- Definition Represents the period for which operations was stopped prior to merger. + References No definition available. + Details
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- Definition Represents the cost of the project which is recoverable from the annual rate increase. + References No definition available. + Details
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- Definition Represents the accumulated costs of the project as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the additional deferred cost of the wind project to be recovered by the entity subject to the PUC approval. + References No definition available. + Details
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- Definition Represents the deferred cost of the wind project to be recovered by the entity subject to the PUC approval. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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