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Proposed Merger (Details) |  |  |  | 1 Months Ended | 10 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) | Aug. 10, 2015 USD ($) | Dec. 03, 2014 USD ($) $ / shares shares | Jul. 31, 2015 intervener | Jan. 31, 2015 USD ($) | Sep. 30, 2015 complaint | Apr. 30, 2015 action
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of purported class action complaints filed | complaint |  |  |  |  |  | 8 |
In re Consolidated HEI Shareholder Cases |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consolidated number of state actions | action |  |  |  |  |  |  | 7
NextEra Energy, Inc Merger |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Merger share conversion ratio | shares |  |  | 0.2413 |  |  |  |
Minimum percentage of shares from which holders approval needed for merger |  |  | 75.00% |  |  |  |
Merger agreement contract extension |  |  | 6 months |  |  |  |
Merger contract termination fee |  |  | $ 90,000,000 |  |  |  |
Maximum expenses paid to party for cancellation of merger |  |  | $ 5,000,000 |  |  |  |
Minimum period that entity agrees not to submit applications for general base rate increase |  |  |  |  | 4 years |  |
Approximate amount of cumulative savings for customers due to forgone recoveries |  |  |  |  | $ 60,000,000 |  |
Number of interveners | intervener |  |  |  | 28 |  |  |
Number of interveners who opposed | intervener |  |  |  | 11 |  |  |
Number of interveners opposed who approved conditionally | intervener |  |  |  | 11 |  |  |
Number of interveners who made no recommendation | intervener |  |  |  | 6 |  |  |
Consumer advocate recommendation, permanent reduction in annual utility rate, amount |  | $ 62,000,000 |  |  |  |  |
Non-fuel O&M savings requirements | 100.00% |  |  |  |  |  |
Fund for public interest | $ 2,500,000 |  |  |  |  |  |
Corporate giving minimum | $ 2,200,000 |  |  |  |  |  |
Years post-closing for corporate giving minimum | 10 years |  |  |  |  |  |
Years post-closing for commitment not to sell utilities or holding company | 10 years |  |  |  |  |  |
NextEra Energy, Inc Merger | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Special dividend | $ / shares |  |  | $ 0.50 |  |  |  |

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