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Accounting for Derivative Instruments and Hedging Activities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Derivative [Line Items]  
Expected losses reclassified to OCI related to cash flow hedges within twelve months $ 500,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Electric Portfolio  
Derivative [Line Items]  
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
PUGET SOUND ENERGY, INC.  
Derivative [Line Items]  
Expected losses reclassified to OCI related to cash flow hedges within twelve months 1,100,000us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
PUGET ENERGY | Interest Rate Swap  
Derivative [Line Items]  
Number of interest rate derivatives held 0us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Credit Rating | Electric Portfolio  
Derivative [Line Items]  
Collateral Already Posted, Aggregate Fair Value 0us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember		 [1]
Credit Rating | Natural Gas Portfolio  
Derivative [Line Items]  
Collateral Already Posted, Aggregate Fair Value $ 1,000,000us-gaap_CollateralAlreadyPostedAggregateFairValue
/ psd_ContingentFeatureAxis
= psd_CreditRatingMember
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_NaturalGasPortfolioMember
External Credit Rating, Investment Grade [Member] | Electric Portfolio  
Derivative [Line Items]  
Percentage of derivatives with credit risk exposure 99.30%psd_DerivativeCreditRiskExposurePercentage
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingInvestmentGradeMember
External Credit Rating, Non Investment Grade [Member] | Electric Portfolio  
Derivative [Line Items]  
Percentage of derivatives with credit risk exposure 0.70%psd_DerivativeCreditRiskExposurePercentage
/ us-gaap_DerivativeInstrumentRiskAxis
= psd_ElectricPortfolioMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
[1] Failure by PSE to maintain an investment grade credit rating from each of the major credit rating agencies provides counterparties a contractual right to demand collateral.