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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Assets41false 4us-gaap_DerivativeLiabilitiesus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse7676700076767000[2],[4]USD$falsetruefalse2truefalsefalse108078000108078000[2],[4]USD$falsetruefalsexbrli:monetaryItemTypemonetaryFair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Liabilities42false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse17false truefalseI2013Q2_us-gaap_DerivativeInstrumentRiskAxis_psd_NaturalGasDerivativesMember_us-gaap_HedgingDesignationAxis_us-gaap_NondesignatedMemberhttp://www.sec.gov/CIK0001085392instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseNot Designated as Hedging Instrument [Member]us-gaap_HedgingDesignationAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NondesignatedMemberus-gaap_HedgingDesignationAxisexplicitMemberfalsefalseNatural Gas Derivatives [Member]us-gaap_DerivativeInstrumentRiskAxisxbrldihttp://xbrl.org/2006/xbrldipsd_NaturalGasDerivativesMemberus-gaap_DerivativeInstrumentRiskAxisexplicitMembermmbtuStandardhttp://www.xbrl.org/2009/utrMMBTUutreg0nanafalse0Not Designated as Hedging Instrument [Member] | Natural Gas Derivatives [Member]43true 3us-gaap_DerivativeLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative [Line Items]44false 4invest_DerivativeNonmonetaryNotionalAmountinvest_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse459420774459420774[4]falsefalsefalse2truefalsefalse516909006516909006[4]falsefalsefalsexbrli:decimalItemTypedecimalAggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B false256Derivative, Nonmonetary Notional Amount1Balance sheet location: Current and Long-term Unrealized gain on derivative instruments.2Balance sheet location: Current and Long-term Unrealized loss on derivative instruments.3Interest rate swap contracts are only held at Puget Energy.4PSE had a net derivative liability and an offsetting regulatory asset of $70.4 million at June 30, 2013 and $96.0 million at December 31, 2012 related to contracts used to economically hedge the cost of physical gas purchased to serve natural gas customers. 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