Number of new mechanisms

No definition available.

Name:	psd_Numberofnewmechanisms
Namespace Prefix:	psd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulated Utility, Allowed Rate of Return on Net Regulatory Assets and Liabilities

+ References

No definition available.

+ Details

Name:	psd_RegulatedUtilityAllowedRateOfReturnOnNetRegulatoryAssetsAndLiabilities
Namespace Prefix:	psd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulated Utlity, After-tax Allowed Rate of Return on Net Regulatory Assets and Liabilities

+ References

No definition available.

+ Details

Name:	psd_RegulatedUtlityAfterTaxAllowedRateOfReturnOnNetRegulatoryAssetsAndLiabilities
Namespace Prefix:	psd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Regulatory Assets and Liabiliaties [Line Items]

+ References

No definition available.

+ Details

Name:	psd_RegulatoryAssetsAndLiabiliatiesLineItems
Namespace Prefix:	psd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreasePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreasePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=psd_GeneralRateCaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=psd_GeneralRateCaseElectricMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=psd_GeneralRateCaseNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ElectricityUsRegulatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_NaturalGasUsRegulatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

General Rate Case Filing (Details) - Subsidiaries [Member] $ in Millions						6 Months Ended
	Jan. 15, 2020 USD ($)	Jun. 20, 2019	Nov. 07, 2018	Dec. 19, 2017 USD ($)	Jan. 13, 2017	Dec. 31, 2013
Regulatory Assets [Line Items]
Regulated Utility, Allowed Rate of Return on Net Regulatory Assets and Liabilities			7.49%	7.60%		7.77%
General Rate Case [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Return on Equity, Percentage				9.50%
Regulated Utility, After-tax Allowed Rate of Return on Net Regulatory Assets and Liabilities				6.55%
Regulated Utility, Allowed Rate of Return on Net Regulatory Assets and Liabilities		7.62%
Public Utilities, Requested Return on Equity, Percentage		9.80%
Public Utilities, Approved Equity Capital Structure, Percentage				48.50%
Number of new mechanisms					2
General Rate Case [Member] \| Subsequent Event [Member]
Regulatory Assets [Line Items]
Regulated Utility, Allowed Rate of Return on Net Regulatory Assets and Liabilities	7.48%
Public Utilities, Requested Return on Equity, Percentage	9.50%
General Rate Case, Electric [Member] \| Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	6.90%
General Rate Case, Natural Gas [Member] \| Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage	7.90%
Electricity, US Regulated [Member] \| General Rate Case [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 20.2
Public Utilities, Requested Rate Increase (Decrease), Percentage		6.90%
Public Utilities, Approved Rate Increase (Decrease), Percentage				0.90%
Electricity, US Regulated [Member] \| General Rate Case [Member] \| Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ (1.5)
Natural Gas, US Regulated [Member] \| General Rate Case [Member]
Regulatory Assets [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				$ (35.5)
Public Utilities, Requested Rate Increase (Decrease), Percentage		7.90%
Public Utilities, Approved Rate Increase (Decrease), Percentage				(3.80%)