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Income Taxes - Components of Deferred Income Tax Liability (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Regulatory liabilities:    
Asset retirement obligation and removal costs $ 229,772pnw_DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts $ 235,959pnw_DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts
Unamortized investment tax credits 96,232pnw_DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits 82,116pnw_DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits
Other postretirement liabilities 90,496pnw_DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits 0pnw_DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits
Other 60,409pnw_DeferredTaxAssetsRegulatoryLiabilitiesOther 42,609pnw_DeferredTaxAssetsRegulatoryLiabilitiesOther
Risk management activities 57,505us-gaap_DeferredTaxAssetsDerivativeInstruments 44,920us-gaap_DeferredTaxAssetsDerivativeInstruments
Pension liabilities 205,227us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 140,773us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other postretirement liabilities 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 57,869us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Renewable energy incentives 65,169pnw_DeferredTaxAssetsRenewableEnergyIncentives 65,434pnw_DeferredTaxAssetsRenewableEnergyIncentives
Credit and loss carryforwards 68,347pnw_DeferredTaxAssetsCreditAndLossCarryforwards 133,070pnw_DeferredTaxAssetsCreditAndLossCarryforwards
Other 138,729us-gaap_DeferredTaxAssetsOther 148,492us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,011,886us-gaap_DeferredTaxAssetsNet 951,242us-gaap_DeferredTaxAssetsNet
DEFERRED TAX LIABILITIES    
Plant-related (2,958,369)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,903,730)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Risk management activities (12,171)us-gaap_DeferredTaxLiabilitiesDerivatives (16,191)us-gaap_DeferredTaxLiabilitiesDerivatives
Other postretirement assets (59,170)pnw_DeferredTaxLiabilitiesOtherPostretirementAssets 0pnw_DeferredTaxLiabilitiesOtherPostretirementAssets
Regulatory assets:    
Allowance for equity funds used during construction (48,286)pnw_DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction (43,058)pnw_DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction
Deferred fuel and purchased power (2,498)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower (8,282)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower
Deferred fuel and purchased power — mark-to-market (38,187)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket (13,343)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket
Pension and other postretirement benefits (191,747)pnw_DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits (129,250)pnw_DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits
Retired power plant costs (see Note 3) (57,255)pnw_DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts (8,199)pnw_DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts
Other (99,123)pnw_DeferredTaxLiabilitiesRegulatoryAssetsOther (85,003)pnw_DeferredTaxLiabilitiesRegulatoryAssetsOther
Other (5,484)us-gaap_DeferredTaxLiabilitiesOther (4,916)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (3,472,290)us-gaap_DeferredTaxLiabilities (3,211,972)us-gaap_DeferredTaxLiabilities
Deferred income taxes — net (2,460,404)us-gaap_DeferredTaxAssetsLiabilitiesNet (2,260,730)us-gaap_DeferredTaxAssetsLiabilitiesNet
ARIZONA PUBLIC SERVICE COMPANY    
Regulatory liabilities:    
Asset retirement obligation and removal costs 229,772pnw_DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
235,959pnw_DeferredTaxAssetsRegulatoryLiabilitiesAssetRetirementObligationAndRemovalCosts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Unamortized investment tax credits 96,232pnw_DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
82,116pnw_DeferredTaxAssetsRegulatoryLiabilitiesUnamortizedInvestmentTaxCredits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other postretirement liabilities 90,496pnw_DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
0pnw_DeferredTaxAssetsRegulatoryLiabilitiesOtherPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other 60,409pnw_DeferredTaxAssetsRegulatoryLiabilitiesOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
42,609pnw_DeferredTaxAssetsRegulatoryLiabilitiesOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Risk management activities 57,505us-gaap_DeferredTaxAssetsDerivativeInstruments
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
44,920us-gaap_DeferredTaxAssetsDerivativeInstruments
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Pension liabilities 194,541us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
132,263us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other postretirement liabilities 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
53,950us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Renewable energy incentives 65,169pnw_DeferredTaxAssetsRenewableEnergyIncentives
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
65,434pnw_DeferredTaxAssetsRenewableEnergyIncentives
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Credit and loss carryforwards 0pnw_DeferredTaxAssetsCreditAndLossCarryforwards
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
38,183pnw_DeferredTaxAssetsCreditAndLossCarryforwards
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other 161,379us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
166,781us-gaap_DeferredTaxAssetsOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Total deferred tax assets 955,503us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
862,215us-gaap_DeferredTaxAssetsNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
DEFERRED TAX LIABILITIES    
Plant-related (2,958,369)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(2,903,730)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Risk management activities (12,171)us-gaap_DeferredTaxLiabilitiesDerivatives
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(16,191)us-gaap_DeferredTaxLiabilitiesDerivatives
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other postretirement assets (58,495)pnw_DeferredTaxLiabilitiesOtherPostretirementAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
0pnw_DeferredTaxLiabilitiesOtherPostretirementAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Regulatory assets:    
Allowance for equity funds used during construction (48,286)pnw_DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(43,058)pnw_DeferredTaxLiabilitiesRegulatoryAssetsAllowanceForEquityFundsUsedDuringConstruction
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Deferred fuel and purchased power (2,498)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(8,282)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPower
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Deferred fuel and purchased power — mark-to-market (38,187)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(13,343)pnw_DeferredTaxLiabilitiesRegulatoryAssetsDeferredFuelAndPurchasedPowerMarkToMarket
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Pension and other postretirement benefits (191,747)pnw_DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(129,250)pnw_DeferredTaxLiabilitiesRegulatoryAssetsPensionAndOtherPostretirementBenefits
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Retired power plant costs (see Note 3) (57,255)pnw_DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(8,199)pnw_DeferredTaxLiabilitiesRegulatoryAssetsRetiredPowerPlanCosts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other (99,123)pnw_DeferredTaxLiabilitiesRegulatoryAssetsOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(85,003)pnw_DeferredTaxLiabilitiesRegulatoryAssetsOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Other (5,484)us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(4,916)us-gaap_DeferredTaxLiabilitiesOther
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Total deferred tax liabilities (3,471,615)us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(3,211,972)us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Deferred income taxes — net $ (2,516,112)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ (2,349,757)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember