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Other related-party transactions (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
HEI consolidated
 
Hawaiian Electric consolidated
(in millions)
2015
 
2014
 
2013
 
2015
 
2014
 
2013
HMSA costs
$
30

 
$
25

 
$
23

 
$
23

 
$
20

 
$
18

HMSA expense*
21

 
18

 
17

 
14

 
13

 
12

HDS costs
3

 
3

 
3

 
2

 
2

 
2

HDS expense*
2

 
2

 
2

 
1

 
1

 
1

* Charged the remaining costs primarily to electric utility plant.