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Regulatory Matters - Schedule of Regulatory Liabilities (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Detail of regulatory liabilities |  |
Regulatory liabilities, current | $ 129,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent | $ 131,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent
Regulatory liabilities, non-current | 1,070,106,000 us-gaap_RegulatoryLiabilityNoncurrent | 1,051,196,000 us-gaap_RegulatoryLiabilityNoncurrent
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 37,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember | 31,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember
Regulatory liabilities, non-current | 264,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember | 273,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RemovalCostsMember
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 0 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember | 0 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember
Regulatory liabilities, non-current | 302,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember | 296,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_AssetRetirementObligationCostsMember
Renewable energy standard |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 25,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RenewableEnergyProgramMember | 25,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RenewableEnergyProgramMember
Regulatory liabilities, non-current | 25,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RenewableEnergyProgramMember | 23,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RenewableEnergyProgramMember
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 1,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | 0 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember
Regulatory liabilities, non-current | 71,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember | 72,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_DeferredIncomeTaxChargesMember
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 5,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_SpentNuclearFuelMember | 5,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_SpentNuclearFuelMember
Regulatory liabilities, non-current | 66,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_SpentNuclearFuelMember | 66,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_SpentNuclearFuelMember
Deferred gains on utility property |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 2,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredGainsonUtilityPropertyMember | 2,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredGainsonUtilityPropertyMember
Regulatory liabilities, non-current | 8,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredGainsonUtilityPropertyMember | 8,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredGainsonUtilityPropertyMember
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_InvestmentCreditMember | 4,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_InvestmentCreditMember
Regulatory liabilities, non-current | 93,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_InvestmentCreditMember | 93,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_InvestmentCreditMember
Deferred fuel and purchased power |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 16,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredFuelandPurchasedPowerMember | 0 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredFuelandPurchasedPowerMember
Regulatory liabilities, non-current | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredFuelandPurchasedPowerMember | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_DeferredFuelandPurchasedPowerMember
Demand side management |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 5,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember | 31,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Regulatory liabilities, non-current | 27,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember | 0 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 32,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | 32,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember
Regulatory liabilities, non-current | 191,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember | 199,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = us-gaap_PostretirementBenefitCostsMember
Other |  |
Detail of regulatory liabilities |  |
Regulatory liabilities, current | 3,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_OtherRegulatoryLiabilitiesMember | 1,000,000 pnw_RegulatoryLiabilityIncludingDeferredFuelAndPurchasedPowerRegulatoryLiabilityCurrent / us-gaap_RegulatoryLiabilityAxis = pnw_OtherRegulatoryLiabilitiesMember
Regulatory liabilities, non-current | $ 23,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_OtherRegulatoryLiabilitiesMember | $ 21,000,000 us-gaap_RegulatoryLiabilityNoncurrent / us-gaap_RegulatoryLiabilityAxis = pnw_OtherRegulatoryLiabilitiesMember

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- Definition The amount for the individual regulatory current liability including deferred fuel and purchased power as itemized in a table of regulatory current liabilities as of the end of the period. + References No definition available. + Details
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