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Palo Verde Sale Leaseback Variable Interest Entities Narrative (Details) (USD $) | 3 Months Ended | 0 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | Jul. 07, 2014 Lease | Dec. 31, 1986 Trust
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | $ 4,605,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | $ 8,925,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |
Arizona Public Service Company |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Number of VIE lessor trusts | 3 pnw_NumberOfVIELessorTrusts / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |  | 3 pnw_NumberOfVIELessorTrusts / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | 4,605,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 8,925,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |
Arizona Public Service Company | Consolidation of VIEs |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Increase in net income due to consolidation of Palo Verde Sale Leaseback Trusts | 5,000,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 9,000,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |
Maximum payment to the VIEs' noncontrolling equity participants upon the occurrence of certain unlikely events | 123,000,000 pnw_VariableInterestEntityEntityMaximumLossExposureToNoncontrollingInterestsPaymentAmount / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |
VIE debt to be assumed upon the occurrence of certain unlikely events | 13,000,000 pnw_VariableInterestEntityLossExposureToDebtAssumedAmount / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |
Arizona Public Service Company | Consolidation of VIEs | Through 2023 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Number of leases under which assets are retained |  |  | 1 pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / pnw_SaleLeasebackTransactionPeriodAxis = pnw_SaleLeasebackTransactionPeriodThrough2023Member / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |
Arizona Public Service Company | Consolidation of VIEs | Through 2033 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Number of leases under which assets are retained |  |  | 2 pnw_SaleLeasebackTransactionNumberOfLeasesUnderWhichAssetsRetainedThroughSpecifiedPeriod / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / pnw_SaleLeasebackTransactionPeriodAxis = pnw_SaleLeasebackTransactionPeriodThrough2033Member / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |
Arizona Public Service Company | Consolidation of VIEs | 2015 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Annual lease payments | 49,000,000 us-gaap_SaleLeasebackTransactionAnnualRentalPayments / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / pnw_SaleLeasebackTransactionPeriodAxis = pnw_SaleLeasebackTransactionPeriod2015Member / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |
Arizona Public Service Company | Consolidation of VIEs | Period 2016 through 2023 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Annual lease payments | 23,000,000 us-gaap_SaleLeasebackTransactionAnnualRentalPayments / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / pnw_SaleLeasebackTransactionPeriodAxis = pnw_SaleLeasebackTransactionPeriod2016Through2023Member / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |
Arizona Public Service Company | Consolidation of VIEs | Period 2024 through 2033 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Annual lease payments | $ 16,000,000 us-gaap_SaleLeasebackTransactionAnnualRentalPayments / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember / pnw_SaleLeasebackTransactionPeriodAxis = pnw_SaleLeasebackTransactionPeriod2024Through2033Member / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |
Maximum | Arizona Public Service Company | Consolidation of VIEs | Period 2024 through 2033 |  |  |  |
Palo Verde Sale Leaseback Variable Interest Entities |  |  |  |
Lease period | 2 years |  |  |

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- Definition Number 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. + References No definition available. + Details
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- Definition Represents the period of lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References No definition available. + Details
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- Definition Represents the number of leases under which assets are retained through a specified period. + References No definition available. + Details
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- Definition Required payment to Variable Interest Entity Noncontrolling interest holders upon the occurrence of certain events. + References No definition available. + Details
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- Definition The 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). + References No definition available. + Details
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- Definition Amount of Net Income (Loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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- Definition The yearly payments due under the lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755 + Details
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- Details
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