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Related party transactions (Tables) | 3 Months Ended
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Mar. 31, 2016
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions | Mr. Timothy Johns, a member of the Hawaiian Electric Board of Directors, is an executive officer of Hawaii Medical Service Association (HMSA). Ms. Susan Li, an executive of Hawaiian Electric, is the Vice Chairperson of the Hawaii Dental Service (HDS) Board of Directors. The Company’s HMSA costs and expense (for health insurance premiums, claims plus administration expense and stop-loss insurance coverages) and HDS costs and expense (for dental insurance premiums) and the Utilities’ HMSA costs and expense (for health insurance premiums) and HDS costs and expense (for dental insurance premiums) were as follows:
|  | Three months ended March 31
(in millions) |  | 2016 |  | 2015
HEI consolidated |  |  |  |
HMSA costs |  | $ | 7 |  |  | $ | 7 |
HMSA expense* |  | 5 |  |  | 5 |
HDS costs |  | 1 |  |  | 1 |
HDS expense* |  | 1 |  |  | 1 |
Hawaiian Electric consolidated |  |  |  |
HMSA costs |  | 6 |  |  | 6 |
HMSA expense* |  | 3 |  |  | 4 |
HDS costs |  | 1 |  |  | 1 |
HDS expense* |  | — |  |  | — |
* Charged the remaining costs primarily to electric utility plant.

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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