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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of future minimum lease payments
HEI's consolidated and the Utilities' future minimum lease payments are as follows:
(in millions)
HEI
 
Hawaiian Electric
2018
$
11

 
$
6

2019
10

 
5

2020
8

 
5

2021
7

 
5

2022
4

 
3

Thereafter
36

 
29

 
$
76

 
$
53
Summary of amounts in income tax expense related to investments in qualifying affordable housing projects
The table below summarizes the amounts in income tax expense related to ASB's investments in qualifying affordable housing projects:
Years ended December 31
2017

 
2016

 
2015

(in millions)
 

 
 

 
 

Amounts in income taxes related to investments in qualifying affordable housing projects
 

 
 

 
 

   Amortization recognized in the provision for income taxes
$
(7.4
)
 
$
(5.8
)
 
$
(5.4
)
   Tax credits and other tax benefits recognized in the provision for income taxes
10.7

 
8.4

 
8.0

         Net benefit to income tax expense
$
3.3

 
$
2.6

 
$
2.6