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Related party transactions (Details) - Affiliated Entity - Hawaii Medical Service Association (HMSA) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
HMSA costs |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related party | $ 8 | $ 6 | $ 22 | $ 18
HMSA costs | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related party | 6 | 5 | 17 | 15
HMSA expense |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related party | 6 | 4 | 16 | 13
HMSA expense | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses from transactions with related party | $ 4 | $ 3 | $ 11 | $ 9

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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