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Leases (Schedule of Future Minimum Lease Payments for Non-cancellable Leases) (Details) (PUGET SOUND ENERGY, INC., USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
PUGET SOUND ENERGY, INC.
 
Operating  
2014 $ 17,677us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2015 21,454us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2016 22,179us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2017 20,423us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2018 15,180us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Thereafter 120,791us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total minimum lease payments 217,704us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Capital  
2014 8,160us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2015 2,178us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2016 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2017 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
2018 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Thereafter 0us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Total minimum lease payments $ 10,338us-gaap_CapitalLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember