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Derivative Accounting Narrative (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Counterparty | Mar. 31, 2014 | Dec. 31, 2014
Derivative Accounting |  |  |
Percentage of deferred unrealized gains (losses) on contracts due to PSA recovery | 100.00%pnw_PercentDeferralofUnrealizedGainLossonCertainContractsDuetoChangesinPSARecovery |  |
Arizona Public Service Company |  |  |
Derivative Accounting |  |  |
Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment | 100.00%pnw_PercentageOfUnrealizedGainsAndLossesOnCertainDerivativesDeferredForFutureRateTreatment / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember |  |
Designated as Hedging Instruments |  |  |
Derivative Accounting |  |  |
Gross recognized derivatives | $ 4,000,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  | $ 4,000,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Commodity Contracts |  |  |
Derivative Accounting |  |  |
Gross recognized derivatives | 203,980,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 169,052,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Amounts offset | (56,900,000)pnw_DerivativeAssetLiabilityFairValueGrossLiabilityAssetandObligationtoReturnandRighttoReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (43,900,000)pnw_DerivativeAssetLiabilityFairValueGrossLiabilityAssetandObligationtoReturnandRighttoReclaimCashOffset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Derivative liability, not subject to master netting arrangement | 7,023,000 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 7,443,000 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Other | 626,000 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 350,000 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Concentration of credit risk, number of counterparties | 1 pnw_DerivativeInstrumentConcentrationOfRiskCounterparties / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |
Concentration of risk with two counterparties, as a percentage of risk management assets | 94.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |
Risk management activities-derivative instruments: Commodity Contracts | 32,102,000 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 31,405,000 us-gaap_DerivativeAssets / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Additional collateral to counterparties for energy related non-derivative instrument contracts | 166,000,000 pnw_NonDerivativeCreditRiskContractAdditionalCollateralAggregateFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  |
Commodity Contracts | Designated as Hedging Instruments |  |  |
Derivative Accounting |  |  |
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges | 0 pnw_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeOnDiscontinuation / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0 pnw_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeOnDiscontinuation / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Estimated net gain (loss) before income taxes to be reclassified from accumulated other comprehensive income | (5,000,000)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |
Current Liabilities | Commodity Contracts |  |  |
Derivative Accounting |  |  |
Gross recognized derivatives | 97,349,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 86,062,000 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Amounts offset | (56,900,000)pnw_DerivativeAssetLiabilityFairValueGrossLiabilityAssetandObligationtoReturnandRighttoReclaimCashOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | (43,900,000)pnw_DerivativeAssetLiabilityFairValueGrossLiabilityAssetandObligationtoReturnandRighttoReclaimCashOffset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Derivative liability, not subject to master netting arrangement | $ 7,023,000 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | $ 7,443,000 us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for non-derivative instruments with credit-risk related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References No definition available. + Details
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- Definition Percentage of unrealized gains and losses on certain derivatives deferred for future rate treatment pursuant to the PSA mechanism that would otherwise be recognized in income. + References No definition available. + Details
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- Definition Percent Deferral of Unrealized Gain (Loss) on Certain Contracts Due to Changes in PSA Recovery + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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