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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Changes in Projected Benefit Obligations
The following tables summarize the Company’s change in benefit obligation, change in plan assets and amounts recognized in the Statements of Financial Position for the years ended December 31, 2020, and 2019:

Puget Energy and
Puget Sound Energy		Qualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Change in benefit obligation:
Benefit obligation at beginning of period$774,305 $677,643 $63,000 $55,708 $11,627 $10,636 
Amendments— — — — 44 9,049 
Service cost24,337 22,656 756 1,023 190 61 
Interest cost25,180 28,913 1,464 2,314 368 410 
Curtailment Loss / (Gain)— — — — — (7,486)
Actuarial loss (gain)69,413 84,272 3,663 6,756 604 (287)
Benefits paid(42,775)(36,740)(22,141)(2,801)(906)(982)
Medicare part D subsidy received— — — — 187 226 
Administrative expense(1,077)(2,439)— — — — 
Benefit obligation at end of period$849,383 $774,305 $46,742 $63,000 $12,114 $11,627 
Schedule of Changes in Fair Value of Plan Assets
Puget Energy and
Puget Sound Energy		Qualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Change in plan assets:
Fair value of plan assets at beginning of period$753,042 $640,242 $— $— $6,289 $5,960 
Actual return on plan assets107,409 133,939 — — 278 1,006 
Employer contribution18,000 18,000 22,141 2,801 257 305 
Benefits paid(42,775)(36,740)(22,141)(2,801)(906)(982)
Administrative expense(1,021)(2,399)— — — — 
Fair value of plan assets at end of period$834,655 $753,042 $— $— $5,918 $6,289 
Funded status at end of period$(14,728)$(21,263)$(46,742)$(63,000)$(6,196)$(5,338)
Schedule of Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income
Puget Energy and
Puget Sound Energy		Qualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Amounts recognized in Consolidated Balance Sheet consist of:
Noncurrent assets$— $— $— $— $— $— 
Current liabilities— — (6,763)(22,604)(293)(308)
Noncurrent liabilities(14,728)(21,263)(39,979)(40,396)(5,903)(5,030)
Net assets (liabilities)$(14,728)$(21,263)$(46,742)$(63,000)$(6,196)$(5,338)
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
Puget Energy and
Puget Sound Energy		Qualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Pension Plans with an Accumulated Benefit Obligation in excess of Plan Assets:
Projected benefit obligation$849,383 $774,305 $46,742 $63,000 $12,114 $11,627 
Accumulated benefit obligation837,455 762,838 44,033 59,988 12,070 11,604 
Fair value of plan assets834,655 753,042 — — 5,918 6,289 
Schedule of Net Benefit Costs
The following tables summarize Puget Energy's and PSE's net periodic benefit cost for the years ended December 31, 2020, 2019, and 2018.
Puget EnergyQualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192018202020192018202020192018
Components of net periodic benefit cost:
Service cost$24,337 $22,656 $22,757 $756 $1,023 $847 $190 $61 $69 
Interest cost25,180 28,913 27,303 1,464 2,314 2,120 368 410 444 
Expected return on plan assets(49,902)(50,249)(50,202)— — — (389)(393)(472)
Amortization of prior service cost (credit)(1,980)(1,980)(1,980)349 331 1,580 — — — 
Amortization of net loss (gain)8,160 1,151 2,187 2,122 1,365 42 (82)(374)(335)
Net periodic benefit cost$5,795 $491 $65 $4,691 $5,033 $4,589 $87 $(296)$(294)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
The following tables summarize Puget Energy's and PSE's benefit obligations recognized in other comprehensive income (OCI) for the years ended December 31, 2020, and 2019:
Puget EnergyQualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Other changes (pre-tax) in plan assets and benefit obligations recognized in other comprehensive income:
Net loss (gain)$11,851 $541 $3,663 $6,756 $715 $(900)
Amortization of net (loss) gain(8,160)(1,151)(2,122)(1,365)82 374 
Settlements, mergers, sales, and closures— — (4,806)— — 2,892 
Prior service cost (credit)— — — — 44 — 
Amortization of prior service (cost) credit1,980 1,980 (349)(331)— — 
Total change in other comprehensive income for year$5,671 $1,370 $(3,614)$5,060 $841 $2,366 
Schedule of Assumptions Used
In accounting for pension and other benefit obligations and costs under the plans, the following weighted-average actuarial assumptions were used by the Company:
Qualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
Benefit Obligation Assumptions202020192018202020192018202020192018
Discount rate2.70 %3.35 %4.40 %2.70 %3.35 %4.40 %2.70 %3.35 %4.40 %
Rate of compensation increase4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 
Interest crediting rate4.00 4.00 4.00 N/AN/AN/AN/AN/AN/A
Medical trend rate1
— — — — — — N/AN/A7.60 
Benefit Cost Assumptions
Discount rate3.35 4.40 4.40 3.35 4.40 4.40 3.35 4.40 4.40 
Return on plan assets7.15 7.50 7.50 — — — 7.00 7.00 7.00 
Rate of compensation increase4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 4.50 
Interest crediting rate4.00 4.00 4.00 N/AN/AN/AN/AN/AN/A
Medical trend rate1
— — — — — — N/AN/A7.60 
Schedule of Expected Benefit Payments
The expected total benefits to be paid during the next five years and the aggregate total to be paid for the five years thereafter are as follows:
(Dollars in Thousands)202120222023202420252025-2029
Qualified Pension total benefits$46,500 $47,300 $48,900 $49,900 $51,200 $261,000 
SERP Pension total benefits6,763 1,901 3,773 6,552 8,041 16,217 
Other Benefits total with Medicare Part D subsidy816 968 936 904 876 3,931 
Other Benefits total without Medicare Part D subsidy997 968 936 904 876 3,931 
Schedule of Allocation of Plan Assets
To obtain the desired return needed to fund the pension benefit plans, the Retirement Plan Committee has established investment allocation percentages by asset classes as follows:

Allocation
Asset ClassMinimumTargetMaximum
Domestic large cap equity25 %31 %40 %
Domestic small cap equity— 9 15 
Non-U.S. equity10 25 30 
Fixed income15 25 30 
Real estate— — 10 
Absolute return5 10 15 
Cash— — 5 
The following table sets forth by level, within the fair value hierarchy, the qualified pension plan as of December 31, 2020, and 2019:
Recurring Fair Value MeasuresRecurring Fair Value Measures
December 31, 2020December 31, 2019
(Dollars in Thousands)Level 1Level 2OtherTotalLevel 1Level 2OtherTotal
Assets:
Mutual Funds$— $— $— $— $91,658 $— $— $91,658 
Common Stock
–Domestic
228,247 53 — 228,300 204,682 — — 204,682 
–Foreign
19,216 — — 19,216 19,464 — — 19,464 
Government Securities73,006 9,148 — 82,154 34,916 — — 34,916 
Corporate Securities
–Domestic
— 6,082 — 6,082 — — — — 
–Foreign
— 3,699 — 3,699 — — — — 
Cash and cash equivalents4,612 3,223 — 7,835 — 150 — 150 
Investments measured at NAV
- Collective Investment Funds— — 342,014 342,014 — — 278,379 278,379 
- Partnership— — 107,137 107,137 — — 69,505 69,505 
- Mutual Funds— — 82,103 82,103 — — 53,784 53,784 
- Other— — 1,096 1,096 — — — — 
Net (payable) receivable— — (44,981)(44,981)— — 505 505 
Total assets$325,081 $22,205 $487,369 $834,655 $350,720 $150 $402,173 $753,043 
Other Pension Plan [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Allocation of Plan Assets
The following table sets forth by level, within the fair value hierarchy, the Other Benefits plan assets which consist of insurance benefits for retired employees, at fair value:
Recurring Fair Value MeasuresRecurring Fair Value Measures
December 31, 2020December 31, 2019
(Dollars in Thousands)Level 1Level 2OtherTotalLevel 1Level 2OtherTotal
Assets:
Mutual fund$5,916 $— $— $5,916 $6,201 $— $— $6,201 
Investments measured at NAV— — — — — — 88 88 
Net (payable) receivable— — 2 2 — — — — 
Total assets$5,916 $— $2 $5,918 $6,201 $— $88 $6,289 

The following discussion provides information regarding the methods used in valuation of the various asset class investments held for the pension and other postretirement benefit plans.

•Mutual funds classified as Level 1 securities have pricing inputs that are based on unadjusted prices in an active market. Principal markets for equity prices include published exchanges such as NASDAQ and New York Stock Exchange (NYSE). Mutual fund assets not included in the fair value hierarchy are privately held funds. These funds are not actively traded and utilize net asset value (NAV) as a practical expedient to measure fair value.
•Common stock investments are traded in active markets on national and international securities exchanges and are valued at closing prices on the last business day of each period presented. They are classified as Level 1 securities.
•Corporate and some government debt securities are valued using pricing models maximizing the use of observable inputs for similar securities. This includes basing value on yields currently available on comparable securities of issuers with similar credit ratings. Some government debt securities have quoted prices such as certain treasury securities and are classified as Level 1 securities.
•Cash and cash equivalents comprise mostly of money market funds and foreign currency held. Money market funds are classified as Level 1 instruments as pricing inputs are based on unadjusted prices in an active market while foreign currency held is classified as a Level 2 investment based on inputs that are indirectly observable.
•Investments in collective trust funds and partnerships are stated at the NAV as determined by the issuer of fund and are based on the fair value of the underlying investments held by the fund less its liabilities. The NAV is used as a practical expedient to estimate fair value. These funds are primarily invested in a blend of corporate and government debt securities as well as international equities.
Parent Company [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income
The following tables summarize Puget Energy's and PSE's pension benefit amounts recognized in accumulated other comprehensive income (AOCI) for the years ended December 31, 2020, and 2019:
Puget EnergyQualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Net loss (gain)$98,010 $94,319 $11,738 $15,003 $600 $(197)
Prior service cost (credit)(1,904)(3,884)927 1,276 44 — 
Total$96,106 $90,435 $12,665 $16,279 $644 $(197)
Subsidiaries [Member]  
Defined Benefit Plan and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Amounts Recognized in Balance Sheet and Accumulated Other Comprehensive Income
Puget Sound EnergyQualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Amounts recognized in Accumulated Other Comprehensive Income consist of:
Net loss (gain)$210,317 $217,502 $12,504 $16,473 $489 $(364)
Prior service cost (credit)(1,513)(3,086)927 1,276 44 — 
Total$208,804 $214,416 $13,431 $17,749 $533 $(364)
Schedule of Net Benefit Costs
Puget Sound EnergyQualified
Pension Benefits		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192018202020192018202020192018
Components of net periodic benefit cost:
Service cost$24,337 $22,656 $22,757 $756 $1,023 $847 $190 $61 $69 
Interest cost25,180 28,913 27,303 1,464 2,314 2,120 368 410 444 
Expected return on plan assets(49,910)(50,267)(50,240)— — — (389)(393)(472)
Amortization of prior service cost (credit)(1,573)(1,573)(1,573)349 333 44 — — — 
Amortization of net loss (gain)19,043 12,877 14,917 2,385 1,733 2,069 (137)(562)(556)
Net periodic benefit cost$17,077 $12,606 $13,164 $4,954 $5,403 $5,080 $32 $(484)$(515)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
Puget Sound EnergyQualified
Pension Benefit		SERP
Pension Benefits		Other
Benefits
(Dollars in Thousands)202020192020201920202019
Other changes (pre-tax) in plan assets and benefit obligations recognized in other comprehensive income:
Net loss (gain)$11,858 $559 $3,663 $6,756 $715 $(900)
Amortization of net (loss) gain(19,043)(12,877)(2,385)(1,733)137 562 
Settlements, mergers, sales, and closures— — (5,248)— — 3,832 
Prior service cost (credit)— — — — 44 — 
Amortization of prior service (cost) credit1,573 1,573 (349)(333)— — 
Total change in other comprehensive income for year$(5,612)$(10,745)$(4,319)$4,690 $896 $3,494