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Related party transactions (Tables)
 9 Months Ended
Sep. 30, 2015
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). The Company’s HMSA costs and expense (for health insurance premiums, claims plus administration expense and stop-loss insurance coverages) and the Utilities’ HMSA costs and expense (for health insurance premiums) were as follows:
 
Three months ended September 30
 
Nine months ended September 30
(in millions)
2015
 
2014
 
2015
 
2014
HEI consolidated
 
 
 
 
 
 
 
HMSA costs
$
8

 
$
6

 
$
22

 
$
18

HMSA expense*
6

 
4

 
16

 
13

Hawaiian Electric consolidated
 
 
 
 
 
 
 
HMSA costs
6

 
5

 
17

 
15

HMSA expense*
4

 
3

 
11

 
9

* Charged the remaining costs primarily to electric utility plant.