2.4.0.84090 - Disclosure - Commitments and Contingencies (Details)truefalsefalse1false USDfalsefalse$D2013Q2_M0401_ArizonaPublicServiceCompanyMemberhttp://www.sec.gov/CIK0000764622duration2013-04-01T00:00:002013-04-02T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$D2013Q2YTD_ArizonaPublicServiceCompanyMemberhttp://www.sec.gov/CIK0000764622duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170ItemStandardhttp://www.pinnaclewest.com/20130630itempnw0USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse1false USDtruefalse$D2013Q2_M0401_ArizonaPublicServiceCompanyMemberhttp://www.sec.gov/CIK0000764622duration2013-04-01T00:00:002013-04-02T00:00:00falsefalseARIZONA PUBLIC SERVICE COMPANYdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipnw_ArizonaPublicServiceCompanyMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0ARIZONA PUBLIC SERVICE COMPANY2true 3pnw_CommitmentsAndContingenciesLineItemspnw_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Palo Verde Nuclear Generating Station3false 4pnw_EstimatedShareOfCostsRelatedToOnSiteInterimStorageOfSpentNuclearFuelpnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse122000000122000000USD$falsetruefalsexbrli:monetaryItemTypemonetaryRepresents the estimated share of costs related to the on-site interim storage of spent nuclear fuel, which is to be incurred over the current life of Palo Verde with respect to the Palo Verde Nuclear Generating Station.No definition available.false2Estimated share of the costs related to on-site interim storage of spent nuclear fuel4false 4us-gaap_RegulatoryLiabilitiesus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse4400000044000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false2Regulatory liability of amounts recovered in retail rates in excess of amounts spent for on-site interim spent fuel storage5false 4pnw_MaximumInsuranceCoveragePerIncidentpnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1260000000012600000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the maximum insurance amount against public liability per occurrence for a nuclear incident.No definition available.false2Maximum insurance against public liability per occurrence for a nuclear incident6false 4pnw_MaximumAvailableNuclearLiabilityInsurancepnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse375000000375000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the maximum available nuclear liability insurance which is provided by commercial insurance carriers, maintained by Palo Verde as required by the Price Anderson Nuclear Industries Indemnity Act.No definition available.false2Maximum available nuclear liability insurance7false 4pnw_RemainingNuclearLiabilityInsuranceThroughMandatoryIndustryWideRetrospectiveAssessmentProgrampnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1220000000012200000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the remaining nuclear liability insurance that is provided through mandatory industry wide retrospective assessment program.No definition available.false2Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program8false 4pnw_MaximumAssessmentPerReactorForEachNuclearIncidentpnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse118000000118000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the maximum assessment per reactor under the program for each nuclear incident.No definition available.false2Maximum assessment per reactor for each nuclear incident9false 4pnw_AnnualLimitPerIncidentWithRespectToMaximumAssessmentpnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1800000018000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the annual limit per incident with respect to the maximum assessment per reactor under the program for each nuclear incident, to be periodically adjusted for inflation.No definition available.false2Annual limit per incident with respect to maximum assessment10false 4pnw_NumberOfVIELessorTrustspnw_falsenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse33falsefalsefalsexbrli:integerItemTypeintegerNumber of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities.No definition available.false256Number of VIE lessor trusts11false 4pnw_MaximumPotentialRetrospectiveAssessmentPerIncidentpnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse103000000103000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the maximum potential retrospective assessment per incident based on the interest of APS in the three Palo Verde units.No definition available.false2Maximum potential retrospective assessment per incident of APS12false 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which has been imposed to the accidental outage policy during the reporting period.No definition available.false2Sublimit for non-nuclear losses which has been imposed to the accidental outage policy16false 4pnw_MaximumAmountThatCouldBeIncurredUnderRetrospectiveAssessmentOfNEILPoliciespnw_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse1800000018000000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryRepresents the maximum amount APS could incur under the current NEIL (Nuclear Electric Insurance Limited) policies for each retrospective assessment declared by NEIL's Board of Directors due to losses.No definition available.false2Maximum amount that APS could incur under the current NEIL policies for each retrospective assessment17false 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