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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Changes in Projected Benefit Obligations
The following table summarizes the Company’s change in benefit obligation for the periods ended September 30, 2017 and December 31, 2016:
Puget Energy and
Puget Sound Energy
Qualified
Pension Benefits
 
SERP
Pension Benefits
 
Other
Benefits
 
Nine Months Ended
 
Year
Ended
 
Nine Months Ended
 
Year
Ended
 
Nine Months Ended
 
Year
Ended
(Dollars in Thousands)
September 30,
2017
 
December 31,
2016
 
September 30,
2017
 
December 31,
2016
 
September 30,
2017
 
December 31,
2016
Change in benefit obligation:
 
 
 
 
 
 
 
 
 
 
 
Benefit obligation at beginning of period
$
652,607

 
$
643,088

 
$
51,734

 
$
51,279

 
$
11,194

 
$
13,946

Service cost
15,060

 
18,913

 
685

 
1,085

 
54

 
93

Interest cost
21,279

 
28,689

 
1,714

 
2,325

 
375

 
533

Actuarial loss (gain)
(253
)
 
1,545

 
—

 
106

 
373

 
(2,262
)
Benefits paid
(31,344
)
 
(38,730
)
 
(1,428
)
 
(3,061
)
 
(857
)
 
(1,264
)
Medicare part D subsidy received
—

 
—

 
—

 
—

 
100

 
148

Administrative Expense
—

 
(898
)
 
—

 
—

 
—

 
—

Benefit obligation at end of period
$
657,349

 
$
652,607

 
$
52,705

 
$
51,734

 
$
11,239

 
$
11,194
Parent Company [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
The following tables summarize the Company’s net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016:
Puget Energy
Qualified
Pension Benefits
 
SERP
Pension Benefits
 
Other
Benefits
 
Three Months Ended September 30,
(Dollars in Thousands)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
5,020

 
$
4,976

 
$
228

 
$
271

 
$
18

 
$
21

Interest cost
7,093

 
7,064

 
571

 
581

 
125

 
88

Expected return on plan assets
(11,945
)
 
(11,589
)
 
—

 
—

 
(115
)
 
(112
)
Amortization of prior service cost
(495
)
 
(495
)
 
11

 
11

 
—

 
—

Amortization of net loss (gain)
—

 
—

 
269

 
228

 
(101
)
 
(233
)
Net periodic benefit cost
$
(327
)
 
$
(44
)
 
$
1,079

 
$
1,091

 
$
(73
)
 
$
(236
)

Puget Energy
Qualified
Pension Benefits
 
SERP
Pension Benefits
 
Other
Benefits
 
Nine Months Ended
September 30,
(Dollars in Thousands)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
15,060

 
$
14,185

 
$
685

 
$
814

 
$
54

 
$
70

Interest cost
21,279

 
21,516

 
1,714

 
1,744

 
375

 
399

Expected return on plan assets
(35,837
)
 
(34,964
)
 
—

 
—

 
(346
)
 
(334
)
Amortization of prior service cost
(1,485
)
 
(1,485
)
 
33

 
32

 
—

 
—

Amortization of net loss (gain)
—

 
—

 
807

 
683

 
(302
)
 
(289
)
Net periodic benefit cost
$
(983
)
 
$
(748
)
 
$
3,239

 
$
3,273

 
$
(219
)
 
$
(154
)
Subsidiaries [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Benefit Costs
 
Puget Sound Energy
Qualified
Pension Benefits
 
SERP
Pension Benefits
 
Other
Benefits
 
 
 
Three Months Ended September 30,
 
(Dollars in Thousands)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
Components of net periodic benefit cost:
 

 
 

 
 

 
 

 
 

 
 

 
Service cost
$
5,020

 
$
4,976

 
$
228

 
$
271

 
$
18

 
$
21

 
Interest cost
7,093

 
7,064

 
571

 
581

 
125

 
88

 
Expected return on plan assets
(11,965
)
 
(11,638
)
 
—

 
—

 
(115
)
 
(112
)
 
Amortization of prior service cost
(393
)
 
(393
)
 
11

 
11

 
—

 
—

 
Amortization of net loss (gain)
3,262

 
3,963

 
392

 
333

 
(160
)
 
(295
)
 
Net periodic benefit cost
$
3,017

 
$
3,972

 
$
1,202

 
$
1,196

 
$
(132
)
 
$
(298
)


 
Puget Sound Energy
Qualified
Pension Benefits
 
SERP
Pension Benefits
 
Other
Benefits
 
 
 
Nine Months Ended
September 30,
 
(Dollars in Thousands)
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
Components of net periodic benefit cost:
 

 
 

 
 

 
 

 
 

 
 

 
Service cost
$
15,060

 
$
14,185

 
$
685

 
$
814

 
$
54

 
$
70

 
Interest cost
21,279

 
21,516

 
1,714

 
1,744

 
375

 
399

 
Expected return on plan assets
(35,896
)
 
(35,110
)
 
—

 
—

 
(346
)
 
(334
)
 
Amortization of prior service cost
(1,180
)
 
(1,180
)
 
33

 
33

 
—

 
—

 
Amortization of net loss (gain)
9,786

 
11,443

 
1,175

 
997

 
(480
)
 
(474
)
 
Net periodic benefit cost
$
9,049

 
$
10,854

 
$
3,607

 
$
3,588

 
$
(397
)
 
$
(339
)