XML 39 R87.htm IDEA: XBRL DOCUMENT v2.4.1.9
Related Party Transactions (Details) (PUGET SOUND ENERGY, INC., USD $)
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Debt Instrument, Fee Amount $ 1,000,000us-gaap_DebtInstrumentFeeAmount  
Short-term note owed to parent $ 28,933,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent $ 29,598,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Affiliated Entity [Member]
    
Related Party Transaction [Line Items]    
Applicable interest rate on credit facility at period end 0.391%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 0.325%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember