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Shareholders' equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of accumulated other comprehensive income
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, 2015
$
(1,872
)
 
$
(54
)
 
$
(24,336
)
 
$
(26,262
)
 
$
—

 
$
925

 
$
925

Current period other comprehensive 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
)
Current period other comprehensive income (loss), net of taxes
(9,472
)
 
(436
)
 
1,239

 
(8,669
)
 
—

 
1,318

 
1,318

Balance, December 31, 2018
$
(24,423
)
 
$
(436
)
 
$
(25,751
)
 
$
(50,610
)
 
$
—

 
$
99

 
$
99
Reclassification Out of Accumulated Other Comprehensive Income
Reclassifications out of AOCI were as follows:
 
 
Amount reclassified from AOCI
 
Affected line item in the Statement of
Years ended December 31
 
2018
 
2017
 
2016
 
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

 
Interest expense
Retirement benefit plans:
 
 

 
 

 
 

 
 
Amortization of prior service credit and net losses recognized during the period in net periodic benefit cost
 
21,015

 
15,737

 
14,518

 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
8,325

 
(78,724
)
 
28,584

 
See Note 9 for additional details
Total reclassifications
 
$
29,340

 
$
(62,533
)
 
$
42,623

 
 
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
 
19,012

 
14,477

 
13,254

 
See Note 9 for additional details
Impact of D&Os of the PUC included in regulatory assets
 
8,325

 
(78,724
)
 
28,584

 
See Note 9 for additional details
Total reclassifications
 
$
27,337

 
$
(63,793
)
 
$
41,665