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Retirement benefits (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of changes in the obligations and assets of the Company's retirement benefit plans and the changes in AOCI (gross) and the funded status
The changes in the obligations and assets of the Company’s and Utilities' retirement benefit plans and the changes in AOCI (gross) for 2015 and 2014 and the funded status of these plans and amounts related to these plans reflected in the Company’s and Utilities' consolidated balance sheet as of December 31, 2015 and 2014 were as follows:
 
2015
 
2014
(in thousands)
Pension
benefits
 
Other
benefits
 
Pension
benefits
 
Other
benefits
HEI consolidated
 
 
 
 
 
 
 
Benefit obligation, January 1
$
1,847,228

 
$
219,209

 
$
1,446,291

 
$
176,099

Service cost
66,260

 
3,927

 
49,264

 
3,490

Interest cost
76,960

 
9,011

 
72,202

 
8,550

Actuarial losses (gains)
(124,239
)
 
(2,911
)
 
342,446

 
39,098

Benefits paid and expenses
(68,179
)
 
(7,696
)
 
(62,975
)
 
(8,028
)
Benefit obligation, December 31
1,798,030

 
221,540

 
1,847,228

 
219,209

Fair value of plan assets, January 1
1,266,060

 
180,332

 
1,186,669

 
179,330

Actual (loss) return on plan assets
(14,422
)
 
(2,866
)
 
81,123

 
9,149

Employer contributions
86,802

 
917

 
60,103

 
(257
)
Benefits paid and expenses
(66,966
)
 
(7,696
)
 
(61,835
)
 
(7,890
)
Fair value of plan assets, December 31
1,271,474

 
170,687

 
1,266,060

 
180,332

Accrued benefit asset (liability), December 31
$
(526,556
)
 
$
(50,853
)
 
$
(581,168
)
 
$
(38,877
)
Other assets
$
12,509

 
$
—

 
$
12,800

 
$
—

Defined benefit pension and other postretirement benefit plans liability
(539,065
)
 
(50,853
)
 
(593,968
)
 
(38,877
)
Accrued benefit asset (liability), December 31
$
(526,556
)
 
$
(50,853
)
 
$
(581,168
)
 
$
(38,877
)
AOCI debit/(credit), January 1 (excluding impact of PUC D&Os)
$
639,831

 
$
20,933

 
$
317,544

 
$
(21,722
)
Recognized during year – prior service credit (cost)
(4
)
 
1,793

 
(88
)
 
1,793

Recognized during year – net actuarial (losses) gains
(36,800
)
 
(1,796
)
 
(20,304
)
 
11

Occurring during year – net actuarial losses (gains)
(21,264
)
 
11,620

 
342,679

 
40,851

AOCI debit/(credit) before cumulative impact of PUC D&Os, December 31
581,763

 
32,550

 
639,831

 
20,933

Cumulative impact of PUC D&Os
(538,784
)
 
(35,333
)
 
(592,291
)
 
(22,975
)
AOCI debit/(credit), December 31
$
42,979

 
$
(2,783
)
 
$
47,540

 
$
(2,042
)
Net actuarial loss (gain)
$
581,951

 
$
44,845

 
$
640,015

 
$
35,022

Prior service gain
(188
)
 
(12,295
)
 
(184
)
 
(14,089
)
AOCI debit/(credit) before cumulative impact of PUC D&Os, December 31
581,763

 
32,550

 
639,831

 
20,933

Cumulative impact of PUC D&Os
(538,784
)
 
(35,333
)
 
(592,291
)
 
(22,975
)
AOCI debit/(credit), December 31
42,979

 
(2,783
)
 
47,540

 
(2,042
)
Income taxes (benefits)
(16,944
)
 
1,084

 
(18,742
)
 
795

AOCI debit/(credit), net of taxes (benefits), December 31
$
26,035

 
$
(1,699
)
 
$
28,798

 
$
(1,247
)
 
 
 
 
 
 
 
 
 
2015
 
2014
(in thousands)
Pension
benefits
 
Other
benefits
 
Pension
benefits
 
Other
benefits
Hawaiian Electric consolidated
 
 
 
 
 
 
 
Benefit obligation, January 1
$
1,690,777

 
$
211,760

 
$
1,320,810

 
$
169,579

Service cost
64,262

 
3,870

 
47,597

 
3,392

Interest cost
70,529

 
8,700

 
65,979

 
8,234

Actuarial losses (gains)
(114,286
)
 
(2,860
)
 
314,210

 
38,488

Benefits paid and expenses
(63,037
)
 
(7,598
)
 
(57,819
)
 
(7,933
)
Transfers
1,445

 
118

 
—

 
—

Benefit obligation, December 31
1,649,690

 
213,990

 
1,690,777

 
211,760

Fair value of plan assets, January 1
1,129,005

 
177,256

 
1,058,260

 
176,291

Actual (loss) return on plan assets
(10,646
)
 
(2,712
)
 
69,242

 
9,036

Employer contributions
85,139

 
864

 
58,948

 
(274
)
Benefits paid and expenses
(62,584
)
 
(7,598
)
 
(57,445
)
 
(7,797
)
Other
919

 
120

 
—

 
—

Fair value of plan assets, December 31
1,141,833

 
167,930

 
1,129,005

 
177,256

Accrued benefit asset (liability), December 31
$
(507,857
)
 
$
(46,060
)
 
$
(561,772
)
 
$
(34,504
)
Other liabilities (short-term)
(425
)
 
(518
)
 
(421
)
 
(460
)
Defined benefit pension and other postretirement benefit plans liability
(507,432
)
 
(45,542
)
 
(561,351
)
 
(34,044
)
Accrued benefit asset (liability), December 31
$
(507,857
)
 
$
(46,060
)
 
$
(561,772
)
 
$
(34,504
)
AOCI debit/(credit), January 1 (excluding impact of PUC D&Os)
$
595,103

 
$
20,090

 
$
295,973

 
$
(21,907
)
Recognized during year – prior service credit (cost)
(40
)
 
1,804

 
(62
)
 
1,804

Recognized during year – net actuarial losses
(33,371
)
 
(1,754
)
 
(18,459
)
 
—

Occurring during year – net actuarial losses (gains)
(20,574
)
 
11,345

 
317,651

 
40,193

AOCI debit/(credit) before cumulative impact of PUC D&Os, December 31
541,118

 
31,485

 
595,103

 
20,090

Cumulative impact of PUC D&Os
(538,784
)
 
(35,333
)
 
(592,291
)
 
(22,975
)
AOCI debit/(credit), December 31
$
2,334

 
$
(3,848
)
 
$
2,812

 
$
(2,885
)
Net actuarial loss (gain)
$
541,071

 
$
43,784

 
$
595,017

 
$
34,192

Prior service cost (gain)
47

 
(12,299
)
 
86

 
(14,102
)
AOCI debit/(credit) before cumulative impact of PUC D&Os, December 31
541,118

 
31,485

 
595,103

 
20,090

Cumulative impact of PUC D&Os
(538,784
)
 
(35,333
)
 
(592,291
)
 
(22,975
)
AOCI debit/(credit), December 31
2,334

 
(3,848
)
 
2,812

 
(2,885
)
Income taxes (benefits)
(908
)
 
1,497

 
(1,094
)
 
1,122

AOCI debit/(credit), net of taxes (benefits), December 31
$
1,426

 
$
(2,351
)
 
$
1,718

 
$
(1,763
)
Schedule of weighted-average asset allocation of defined benefit retirement plans
The asset allocation of defined benefit retirement plans to equity and fixed income securities managers and related investment policy targets and ranges were as follows:
 
Pension benefits1
 
Other benefits2
 
 
 
 
 
Investment policy
 
 
 
 
 
Investment policy
December 31
2015

 
2014

 
Target

 
Range
 
2015

 
2014

 
Target

 
Range
Assets held by category
 

 
 

 
 

 
 
 
 

 
 

 
 

 
 
Equity securities managers
70
%
 
73
%
 
70
%
 
65-75
 
70
%
 
72
%
 
70
%
 
65-75
Fixed income securities managers
30

 
27

 
30

 
25-35
 
30

 
28

 
30

 
25-35
 
100
%
 
100
%
 
100
%
 
 
 
100
%
 
100
%
 
100
%
 
 

1  
Asset allocation for 2015 and 2014 is applicable to only HEI and the Utilities. In 2014, ASB revised its defined benefit pension plan asset allocation to a liability driven investment strategy and as of December 31, 2015 and 2014, nearly all of its pension assets were invested in fixed income securities.
2 
Asset allocation for 2015 and 2014 is applicable to only HEI and the Utilities. ASB does not fund its other benefits.
Schedule of weighted-average assumptions used in accounting for plans
The following weighted-average assumptions were used in the accounting for the plans:
 
Pension benefits
 
Other benefits
December 31
2015
 
2014
 
2013
 
2015
 
2014
 
2013
Benefit obligation
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.60
%
 
4.22
%
 
5.09
%
 
4.57
%
 
4.17
%
 
5.03
%
Rate of compensation increase
3.5

 
3.5

 
3.5

 
NA   

 
NA   

 
NA   

Net periodic pension/benefit cost (years ended)
 
 
 
 
 
 
 
 
 
 
 
Discount rate
4.22

 
5.09

 
4.13

 
4.17

 
5.03

 
4.07

Expected return on plan assets1
7.75

 
7.75

 
7.75

 
7.75

 
7.75

 
7.75

Rate of compensation increase
3.5

 
3.5

 
3.5

 
NA   

 
NA   

 
NA   

NA  Not applicable
1 For 2015, HEI's and utilities' plan assets only. For 2015, ASB's expected return on plan assets was 4.22%.
Schedule of components of net periodic benefit cost for consolidated HEI
The components of NPPC and NPBC were as follows:
 
Pension benefits
 
Other benefits
(in thousands)
2015
 
2014
 
2013
 
2015
 
2014
 
2013
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
66,260

 
$
49,264

 
$
56,405

 
$
3,927

 
$
3,490

 
$
4,306

Interest cost
76,960

 
72,202

 
64,788

 
9,011

 
8,550

 
7,569

Expected return on plan assets
(88,554
)
 
(81,355
)
 
(72,537
)
 
(11,664
)
 
(10,902
)
 
(10,147
)
Amortization of net prior service (gain) cost
4

 
88

 
(97
)
 
(1,793
)
 
(1,793
)
 
(1,793
)
Amortization of net actuarial losses (gains)
36,800

 
20,304

 
38,438

 
1,796

 
(11
)
 
1,602

Net periodic pension/benefit cost
91,470

 
60,503

 
86,997

 
1,277

 
(666
)
 
1,537

Impact of PUC D&Os
(40,011
)
 
(13,324
)
 
(38,104
)
 
(240
)
 
1,976

 
(1,458
)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
51,459

 
47,179

 
48,893

 
1,037

 
1,310

 
79

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
64,262

 
$
47,597

 
$
54,482

 
$
3,870

 
$
3,392

 
$
4,163

Interest cost
70,529

 
65,979

 
59,119

 
8,700

 
8,234

 
7,288

Expected return on plan assets
(82,541
)
 
(72,661
)
 
(64,551
)
 
(11,495
)
 
(10,739
)
 
(10,002
)
Amortization of net prior service (gain) cost
40

 
62

 
(464
)
 
(1,804
)
 
(1,804
)
 
(1,803
)
Amortization of net actuarial losses
33,371

 
18,459

 
34,597

 
1,754

 
—

 
1,544

Net periodic pension/benefit cost
85,661

 
59,436

 
83,183

 
1,025

 
(917
)
 
1,190

Impact of PUC D&Os
(40,011
)
 
(13,324
)
 
(38,104
)
 
(240
)
 
1,976

 
(1,458
)
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
$
45,650

 
$
46,112

 
$
45,079

 
$
785

 
$
1,059

 
$
(268
)
Schedule of amounts in accumulated other comprehensive Income (loss) to be recognized over next fiscal year
The estimated prior service credit, net actuarial loss and net transition obligation for defined benefit plans that will be amortized from AOCI or regulatory assets into NPPC and NPBC during 2016 is as follows:
 
HEI consolidated
 
Hawaiian Electric consolidated
(in millions)
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
Estimated prior service cost (credit)
$
(0.1
)
 
$
(1.8
)
 
$
—

 
$
(1.8
)
Net actuarial loss
23.9

 
1.1

 
21.8

 
1.1