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Short-term borrowings (Details) (USD $) | 12 Months Ended |  |  |  | 0 Months Ended |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 05, 2011 HEI Institution | Dec. 31, 2013 HEI | Dec. 31, 2012 HEI | Dec. 31, 2013 HEI Minimum | Dec. 05, 2011 HEI Minimum | Dec. 05, 2011 HEI Maximum | 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 | Dec. 05, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Institution | Dec. 31, 2010 Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 05, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Maximum | Dec. 31, 2013 HELCO | Dec. 31, 2012 HELCO | Dec. 31, 2011 HELCO | Dec. 31, 2010 HELCO | Dec. 31, 2013 MECO | Dec. 31, 2012 MECO | Dec. 31, 2011 MECO | Dec. 31, 2010 MECO | Dec. 31, 2013 Interest rate on draws, alternative one | Dec. 05, 2011 Interest rate on draws, alternative one Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Interest rate on draws, alternative one Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 05, 2011 Interest rate on draws, alternative two HEI | Dec. 05, 2011 Interest rate on draws, alternative two Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Interest rate on draws, alternative three | Dec. 05, 2011 Interest rate on draws, alternative three HEI | Dec. 05, 2011 Interest rate on draws, alternative three Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Interest rate on draws, alternative three Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Interest rate on draws, alternative four | Dec. 05, 2011 Interest rate on draws, alternative four HEI | Dec. 05, 2011 Interest rate on draws, alternative four Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Interest rate on draws, alternative four Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2013 Commercial paper HEI | Dec. 31, 2012 Commercial paper HEI
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount | $ 105,482,000 | $ 83,693,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 105,000,000 | $ 84,000,000
Weighted-average interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% | 0.90%
Maximum capacity under syndicated credit facilities |  |  |  |  | 125,000,000 |  |  |  |  |  | 175,000,000 |  |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capacity under syndicated credit facilities |  |  |  |  | 125,000,000 |  |  |  |  |  | 175,000,000 |  |  | 175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of financial institutions |  |  |  |  | 8 |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, reference rate |  |  |  |  | Adjusted LIBO Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Adjusted LIBO Rate |  | Prime Rate | Prime Rate |  | Federal Funds Rate | Federal Funds Rate |  |  | “Adjusted LIBO Rate” for a one month “Interest Period” | “Adjusted LIBO Rate” for a one month “Interest Period” |  |  |
Line of credit facility basis point spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  | 1.50% |  |  | 0.50% |  |  | 0.50% | 0.50% |  |  | 0.50% |  |
Annual fees on undrawn commitments, basis points (as a percent) | 0.25% |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual capitalization ratio (as a percent) |  |  |  |  |  | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net worth | 1,727,070,000 | 1,593,865,000 | 1,528,706,000 | 1,480,394,000 |  | 1,727,070,000 | 1,593,865,000 |  | 975,000,000 |  | 1,593,564,000 | 1,472,136,000 | 1,402,841,000 |  | 1,334,155,000 |  | 274,802,000 | 268,908,000 | 280,468,000 | 269,986,000 | 248,771,000 | 228,927,000 | 235,568,000 | 229,651,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net worth calculated under the agreement |  |  |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.00% |  |  |  | 43.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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