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Short-term borrowings (Details) (USD $) |  |  | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Hawaiian Electric Company, Inc. and Subsidiaries Institution | Dec. 31, 2011 Parent | Dec. 31, 2011 Interest rate on draws, alternative one Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Interest rate on draws, alternative two | Dec. 31, 2011 Interest rate on draws, alternative two Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Interest rate on draws, alternative three | Dec. 31, 2011 Interest rate on draws, alternative three Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Interest rate on draws, alternative four | Dec. 31, 2011 Interest rate on draws, alternative four Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2011 Commercial paper Hawaiian Electric Company, Inc. and Subsidiaries | Dec. 31, 2010 Commercial paper Hawaiian Electric Company, Inc. and Subsidiaries
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount | $ 68,821,000 | $ 24,923,000 |  |  |  |  |  |  |  |  |  | $ 69,000,000 | $ 25,000,000
Weighted-average interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 0.80% | 0.90%
Maximum capacity under syndicated credit facilities |  |  | 175,000,000 | 125,000,000 |  |  |  |  |  |  |  |  |
Credit agreements |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum capacity under syndicated credit facilities |  |  | $ 175,000,000 | $ 125,000,000 |  |  |  |  |  |  |  |  |
Number of financial institutions |  |  | 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 points (as a percent) |  |  | 2.25% |  | 1.50% |  |  | 0.50% | 0.50% | 0.50% | 0.50% |  |
Annual fees on undrawn commitments, basis points (as a percent) |  |  | 0.25% |  |  |  |  |  |  |  |  |  |

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: 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 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
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- Definition Sum of the carrying amounts at the balance sheet date of short-term borrowings not otherwise specified in the taxonomy having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 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(a)(7)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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