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Regulatory Matters- Schedule of Regulatory Assets (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Detail of regulatory assets |  |
Regulatory assets, current | $ 148,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent | $ 138,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent
Regulatory assets, non-current | 1,067,830,000 us-gaap_RegulatoryAssetsNoncurrent | 1,054,087,000 us-gaap_RegulatoryAssetsNoncurrent
Pension benefits |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_PensionAndOtherPostRetirementBenefitsMember | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_PensionAndOtherPostRetirementBenefitsMember
Regulatory assets, non-current | 479,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_PensionAndOtherPostRetirementBenefitsMember | 485,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_PensionAndOtherPostRetirementBenefitsMember
Income taxes — allowance for funds used during construction (“AFUDC”) equity |  |
Detail of regulatory assets |  |
Regulatory assets, current | 5,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember | 5,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember
Regulatory assets, non-current | 117,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember | 118,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_DeferredIncomeTaxChargesMember
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 66,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerMTMCostsMember | 51,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerMTMCostsMember
Regulatory assets, non-current | 72,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerMTMCostsMember | 46,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerMTMCostsMember
Transmission vegetation management |  |
Detail of regulatory assets |  |
Regulatory assets, current | 9,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_TransmissionVegetationManagementMember | 9,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_TransmissionVegetationManagementMember
Regulatory assets, non-current | 2,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_TransmissionVegetationManagementMember | 5,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_TransmissionVegetationManagementMember
Coal reclamation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_CoalReclamationMember | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_CoalReclamationMember
Regulatory assets, non-current | 6,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_CoalReclamationMember | 7,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_CoalReclamationMember
Palo Verde VIEs (Note 6) |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Regulatory assets, non-current | 30,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 35,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Deferred compensation |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredCompensationMember | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredCompensationMember
Regulatory assets, non-current | 36,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredCompensationMember | 34,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredCompensationMember
Deferred fuel and purchased power |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerCostsMember | 7,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerCostsMember
Regulatory assets, non-current | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerCostsMember | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredFuelAndPurchasedPowerCostsMember
Tax expense of Medicare subsidy |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_TaxExpenseOfMedicareSubsidyMember | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_TaxExpenseOfMedicareSubsidyMember
Regulatory assets, non-current | 14,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_TaxExpenseOfMedicareSubsidyMember | 14,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_TaxExpenseOfMedicareSubsidyMember
Loss on reacquired debt |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember | 1,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember
Regulatory assets, non-current | 16,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember | 16,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_LossOnReacquiredDebtMember
Income taxes — investment tax credit basis adjustment |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_InvestmentCreditMember | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_InvestmentCreditMember
Regulatory assets, non-current | 46,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_InvestmentCreditMember | 46,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_InvestmentCreditMember
Pension and other postretirement benefits deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPensionAndOtherPostRetirementBenefitsMember | 4,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPensionAndOtherPostRetirementBenefitsMember
Regulatory assets, non-current | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPensionAndOtherPostRetirementBenefitsMember | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPensionAndOtherPostRetirementBenefitsMember
Four Corners cost deferral |  |
Detail of regulatory assets |  |
Regulatory assets, current | 7,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_FourCornersCostDeferralMember | 7,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_FourCornersCostDeferralMember
Regulatory assets, non-current | 68,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_FourCornersCostDeferralMember | 70,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_FourCornersCostDeferralMember
Lost fixed cost recovery |  |
Detail of regulatory assets |  |
Regulatory assets, current | 43,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_LostFixedCostRecoveryMember | 38,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_LostFixedCostRecoveryMember
Regulatory assets, non-current | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_LostFixedCostRecoveryMember | 0 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_LostFixedCostRecoveryMember
Retired power plant costs |  |
Detail of regulatory assets |  |
Regulatory assets, current | 10,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_RetiredPowerPlantCostsMember | 10,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_RetiredPowerPlantCostsMember
Regulatory assets, non-current | 134,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_RetiredPowerPlantCostsMember | 136,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_RetiredPowerPlantCostsMember
Deferred property taxes |  |
Detail of regulatory assets |  |
Regulatory assets, current | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPropertyTaxesMember | 0 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPropertyTaxesMember
Regulatory assets, non-current | 36,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPropertyTaxesMember | 30,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = pnw_DeferredPropertyTaxesMember
Other |  |
Detail of regulatory assets |  |
Regulatory assets, current | 1,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_OtherRegulatoryAssetsLiabilitiesMember | 2,000,000 pnw_RegulatoryAssetIncludingDeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / us-gaap_RegulatoryAssetAxis = us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Regulatory assets, non-current | 12,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_OtherRegulatoryAssetsLiabilitiesMember | 12,000,000 us-gaap_RegulatoryAssetsNoncurrent / us-gaap_RegulatoryAssetAxis = us-gaap_OtherRegulatoryAssetsLiabilitiesMember
Arizona Public Service Company |  |
Detail of regulatory assets |  |
Regulatory assets, non-current | $ 1,067,830,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ 1,054,087,000 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember

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- Definition The amount for the individual regulatory current asset including deferred fuel and purchased power as itemized in a table of regulatory current assets as of the end of the period. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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