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Dividend Payment Restrictions (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Parent [Line Items]  
Retained Earnings, Unappropriated $ 438.4us-gaap_RetainedEarningsUnappropriated
Dividends, Earnings Before Interest, Tax, Deprecation and Amortization Ratio, Threshold For Dividend Payment 2psd_DividendsEarningsBeforeInterestTaxDeprecationAndAmortizationRatioThresholdForDividendPayment
Dividends, Earnings Before Interest, Tax, Deprecation and Amortization Ratio at Period End 3.1psd_DividendsEarningsBeforeInterestTaxDeprecationAndAmortizationRatioAtPeriodEnd
PUGET SOUND ENERGY, INC.  
Parent [Line Items]  
Dividends, Common Equity Ratio, Threshold For Dividend Payment 44.00%psd_DividendsCommonEquityRatioThresholdForDividendPayment
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Dividends, Earnings Before Interest, Tax, Deprecation and Amortization Ratio, Threshold For Dividend Payment 3psd_DividendsEarningsBeforeInterestTaxDeprecationAndAmortizationRatioThresholdForDividendPayment
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Dividends, Common Equity Ratio at Period End 47.70%psd_DividendsCommonEquityRatioAtPeriodEnd
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Dividends, Earnings Before Interest, Tax, Deprecation and Amortization Ratio at Period End 4.3psd_DividendsEarningsBeforeInterestTaxDeprecationAndAmortizationRatioAtPeriodEnd
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember