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Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 false2Equity-Noncontrolling interests28false 4pnw_VariableInterestEntityEntityMaximumLossExposureToNoncontrollingInterestsPaymentAmountpnw_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse142000000142000000USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryRequired payment to Variable Interest Entity Noncontrolling interest holders upon the occurrence of certain events.No definition available.false2Maximum payment to the VIEs' noncontrolling equity participants upon the occurrence of certain unlikely events29false 4pnw_VariableInterestEntityLossExposureToDebtAssumedAmountpnw_falsecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse5700000057000000USD$falsetruefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe amount of exposure to loss, upon the occurrence of certain events, in the form of assumed debt that is already reflected in the Consolidated Balance Sheets, as a result of involvement with the Variable Interest Entity (VIE).No definition available.false2VIE debt to be assumed upon the occurrence of certain unlikely eventsfalsePalo Verde Sale Leaseback Variable Interest Entities (Details) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.pinnaclewest.com/role/DisclosurePaloVerdeSaleLeasebackVariableInterestEntitiesDetails529