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Shareholders' equity
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Shareholders' equity
7 · Shareholders’ equity
Reserved shares.  As of December 31, 2017, HEI had reserved a total of 12,158,460 shares of common stock for future issuance under the HEI Dividend Reinvestment and Stock Purchase Plan (DRIP), the Hawaiian Electric Industries Retirement Savings Plan (HEIRSP), the HEI 2011 Nonemployee Director Stock Plan, the ASB 401(k) Plan and the 2010 Executive Incentive Plan.
Equity forward transaction. On March 19, 2013, HEI entered into an equity forward transaction in connection with a public offering on that date for 6.1 million shares of HEI common stock at $26.75 per share. On March 20, 2015, HEI settled the remaining 4.7 million shares under the equity forward for proceeds of $104.5 million (net of the underwriting discount of $4.7 million), which funds were used for the reduction of debt and for general corporate purposes. The proceeds were recorded in equity at the time of settlement. Prior to their settlement, the shares remaining under the equity forward transactions were reflected in HEI’s diluted EPS calculations using the treasury stock method. For 2015, the equity forward transactions did not have a material dilutive effect on HEI’s EPS.
Accumulated other comprehensive income/(loss).  Changes in the balances of each component of accumulated other comprehensive income/(loss) (AOCI) were as follows:
 
HEI Consolidated
 
Hawaiian Electric Consolidated
 (in thousands)
 Net unrealized gains (losses) on securities
 
 Unrealized gains (losses) on derivatives
 
 Retirement benefit plans
 
AOCI
 
 Unrealized gains (losses) on derivatives
 
 Retirement benefit plans
 
AOCI
Balance, December 31, 2014
$
462

 
$
(289
)
 
$
(27,551
)
 
$
(27,378
)
 
$
—

 
$
45

 
$
45

Current period other comprehensive income (loss), net of taxes
(2,334
)
 
235

 
3,215

 
1,116

 
—

 
880

 
880

Balance, December 31, 2015
(1,872
)
 
(54
)
 
(24,336
)
 
(26,262
)
 
—

 
925

 
925

Current period other comprehensive income (loss), net of taxes
(6,059
)
 
(400
)
 
(408
)
 
(6,867
)
 
(454
)
 
(793
)
 
(1,247
)
Balance, December 31, 2016
(7,931
)
 
(454
)
 
(24,744
)
 
(33,129
)
 
(454
)
 
132

 
(322
)
Current period other comprehensive income (loss), net of taxes
(4,370
)
 
454

 
2,544

 
(1,372
)
 
454

 
(1,142
)
 
(688
)
Reclass of AOCI for tax rate reduction impact
(2,650
)
 
—

 
(4,790
)
 
(7,440
)
 
—

 
(209
)
 
(209
)
Balance, December 31, 2017
$
(14,951
)
 
$
—

 
$
(26,990
)
 
$
(41,941
)
 
$
—

 
$
(1,219
)
 
(1,219
)

Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
Affected line item in the Statement of
Years ended December 31
 
2017
 
2016
 
2015
 
Income/Balance Sheet
(in thousands)
 
 
 
 
 
 
 
 
HEI consolidated
 
 
 
 
 
 
 
 
Net realized gains on securities included in net income
 
$
—

 
$
(360
)
 
$
—

 
Revenues-bank (gains on sale of investment securities, net)
Derivatives qualifying as cash flow hedges:
 
 
 
 

 
 

 
 
Window forward contracts
 
454

 
(173
)
 
—

 
Property, plant and equipment-electric utilities (2017); Revenues-electric utilities (gains on window forward contracts (2016)
Interest rate contracts (settled in 2011)
 
—

 
54

 
235

 
Interest expense
Retirement benefit plans:
 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
15,737

 
14,518

 
22,465

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(78,724
)
 
28,584

 
(25,139
)
 
See Note 8 for additional details
Total reclassifications
 
$
(62,533
)
 
$
42,623

 
$
(2,439
)
 
 
Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Derivatives qualifying as cash flow hedges
 
 
 
 
 
 
 
 
Window forward contracts
 
454

 
(173
)
 
—

 
Property, plant and equipment (2017); Revenues (gains on window forward contracts (2016)
Retirement benefit plans:
 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
$
14,477

 
$
13,254

 
$
20,381

 
See Note 8 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
(78,724
)
 
28,584

 
(25,139
)
 
See Note 8 for additional details
Total reclassifications
 
$
(63,793
)
 
$
41,665

 
$
(4,758
)