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Related party transactions (Tables) | 3 Months Ended
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Mar. 31, 2017
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions | 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) | 2017 |  | 2016
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* | 4 |  |  | 3 |
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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