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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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CURRENT ASSETS |  |
Cash and cash equivalents | $ 11,664 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 7,604 us-gaap_CashAndCashEquivalentsAtCarryingValue
Customer and other receivables | 242,457 us-gaap_AccountsReceivableGrossCurrent | 297,740 us-gaap_AccountsReceivableGrossCurrent
Accrued unbilled revenues | 94,400 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear | 100,533 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Allowance for doubtful accounts | (2,560)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (3,094)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Materials and supplies (at average cost) | 221,276 us-gaap_OtherInventorySupplies | 218,889 us-gaap_OtherInventorySupplies
Fossil fuel (at average cost) | 44,705 us-gaap_EnergyRelatedInventoryOtherFossilFuel | 37,097 us-gaap_EnergyRelatedInventoryOtherFossilFuel
Deferred income taxes | 113,521 us-gaap_DeferredTaxAssetsNetCurrent | 122,232 us-gaap_DeferredTaxAssetsNetCurrent
Income tax receivable (Note 5) | 3,317 us-gaap_IncomeTaxesReceivable | 3,098 us-gaap_IncomeTaxesReceivable
Assets from risk management activities (Note 7) | 13,658 us-gaap_DerivativeInstrumentsAndHedges | 13,785 us-gaap_DerivativeInstrumentsAndHedges
Deferred fuel and purchased power regulatory asset (Note 3) | 0 pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent | 6,926 pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent
Other regulatory assets (Note 3) | 147,869 us-gaap_RegulatoryAssetsCurrent | 129,808 us-gaap_RegulatoryAssetsCurrent
Other current assets | 45,135 us-gaap_OtherAssetsCurrent | 38,817 us-gaap_OtherAssetsCurrent
Total current assets | 935,442 us-gaap_AssetsCurrent | 973,435 us-gaap_AssetsCurrent
INVESTMENTS AND OTHER ASSETS |  |
Assets from risk management activities (Note 7) | 18,444 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent | 17,620 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Nuclear decommissioning trust (Note 12) | 727,342 us-gaap_DecommissioningTrustAssetsAmount | 713,866 us-gaap_DecommissioningTrustAssetsAmount
Other assets | 51,449 us-gaap_OtherAssetsNoncurrent | 54,047 us-gaap_OtherAssetsNoncurrent
Total investments and other assets | 797,235 pnw_TotalInvestmentsAndOtherAssets | 785,533 pnw_TotalInvestmentsAndOtherAssets
PROPERTY, PLANT AND EQUIPMENT |  |
Plant in service and held for future use | 15,551,726 us-gaap_PropertyPlantAndEquipmentGross | 15,543,063 us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization | (5,452,860)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (5,397,751)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net | 10,098,866 us-gaap_PropertyPlantAndEquipmentNet | 10,145,312 us-gaap_PropertyPlantAndEquipmentNet
Construction work in progress | 841,426 us-gaap_ConstructionInProgressGross | 682,807 us-gaap_ConstructionInProgressGross
Palo Verde sale leaseback, net of accumulated depreciation (Note 6) | 120,287 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets | 121,255 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Intangible assets, net of accumulated amortization | 127,620 us-gaap_IntangibleAssetsNetExcludingGoodwill | 119,755 us-gaap_IntangibleAssetsNetExcludingGoodwill
Nuclear fuel, net of accumulated amortization | 136,557 us-gaap_NuclearFuelNetOfAmortization | 125,201 us-gaap_NuclearFuelNetOfAmortization
Total property, plant and equipment | 11,324,756 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet | 11,194,330 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
DEFERRED DEBITS |  |
Regulatory assets (Note 3) | 1,067,830 us-gaap_RegulatoryAssetsNoncurrent | 1,054,087 us-gaap_RegulatoryAssetsNoncurrent
Assets for other postretirement benefits (Note 4) | 156,192 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent | 152,290 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Other | 154,248 us-gaap_OtherDeferredCostsNet | 153,857 us-gaap_OtherDeferredCostsNet
Total deferred debits | 1,378,270 pnw_TotalDeferredDebits | 1,360,234 pnw_TotalDeferredDebits
TOTAL ASSETS | 14,435,703 us-gaap_Assets | 14,313,532 us-gaap_Assets
CURRENT LIABILITIES |  |
Accounts payable | 271,489 us-gaap_AccountsPayableCurrent | 295,211 us-gaap_AccountsPayableCurrent
Accrued taxes (Note 5) | 188,724 us-gaap_TaxesPayableCurrent | 140,613 us-gaap_TaxesPayableCurrent
Accrued interest | 42,096 us-gaap_InterestPayableCurrent | 52,603 us-gaap_InterestPayableCurrent
Common dividends payable | 0 us-gaap_DividendsPayableCurrent | 65,790 us-gaap_DividendsPayableCurrent
Short-term borrowings (Note 2) | 44,500 us-gaap_ShortTermBorrowings | 147,400 us-gaap_ShortTermBorrowings
Current maturities of long-term debt (Note 2) | 383,570 us-gaap_OtherLongTermDebtCurrent | 383,570 us-gaap_OtherLongTermDebtCurrent
Customer deposits | 72,561 us-gaap_CustomerDepositsCurrent | 72,307 us-gaap_CustomerDepositsCurrent
Liabilities from risk management activities (Note 7) | 62,303 us-gaap_DerivativeInstrumentsAndHedgesLiabilities | 59,676 us-gaap_DerivativeInstrumentsAndHedgesLiabilities
Deferred fuel and purchased power regulatory liability (Note 3) | 16,359 pnw_DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent | 0 pnw_DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent
Liabilities for asset retirements (Note 15) | 28,918 us-gaap_AssetRetirementObligationCurrent | 32,462 us-gaap_AssetRetirementObligationCurrent
Other regulatory liabilities (Note 3) | 113,024 us-gaap_RegulatoryLiabilityCurrent | 130,549 us-gaap_RegulatoryLiabilityCurrent
Other current liabilities | 150,432 us-gaap_OtherLiabilitiesCurrent | 178,962 us-gaap_OtherLiabilitiesCurrent
Total current liabilities | 1,373,976 us-gaap_LiabilitiesCurrent | 1,559,143 us-gaap_LiabilitiesCurrent
LONG-TERM DEBT LESS CURRENT MATURITIES (Note 2) | 3,281,319 us-gaap_LongTermDebtNoncurrent | 3,031,215 us-gaap_LongTermDebtNoncurrent
DEFERRED CREDITS AND OTHER |  |
Deferred income taxes | 2,586,180 us-gaap_DeferredTaxLiabilitiesNoncurrent | 2,582,636 us-gaap_DeferredTaxLiabilitiesNoncurrent
Regulatory liabilities (Note 3) | 1,070,106 us-gaap_RegulatoryLiabilityNoncurrent | 1,051,196 us-gaap_RegulatoryLiabilityNoncurrent
Liabilities for asset retirements (Note 15) | 379,263 us-gaap_AssetRetirementObligationsNoncurrent | 358,288 us-gaap_AssetRetirementObligationsNoncurrent
Liabilities for pension benefits (Note 4) | 412,552 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent | 453,736 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Liabilities from risk management activities (Note 7) | 73,827 us-gaap_DerivativeLiabilitiesNoncurrent | 50,602 us-gaap_DerivativeLiabilitiesNoncurrent
Customer advances | 122,259 us-gaap_CustomerAdvancesForConstruction | 123,052 us-gaap_CustomerAdvancesForConstruction
Coal mine reclamation | 199,218 us-gaap_MineReclamationAndClosingLiabilityNoncurrent | 198,292 us-gaap_MineReclamationAndClosingLiabilityNoncurrent
Deferred investment tax credit | 178,313 us-gaap_AccumulatedDeferredInvestmentTaxCredit | 178,607 us-gaap_AccumulatedDeferredInvestmentTaxCredit
Unrecognized tax benefits (Note 5) | 14,196 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | 19,377 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Other | 191,487 us-gaap_OtherLiabilitiesNoncurrent | 188,286 us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other | 5,227,401 us-gaap_DeferredCreditsAndOtherLiabilities | 5,204,072 us-gaap_DeferredCreditsAndOtherLiabilities
COMMITMENTS AND CONTINGENCIES (SEE NOTES) |  |
EQUITY |  |
Common stock, no par value; authorized 150,000,000 shares, 110,809,492 and 110,649,762 issued at respective dates | 2,523,247 us-gaap_CommonStockValue | 2,512,970 us-gaap_CommonStockValue
Treasury stock at cost; 61,784 and 78,400 shares at respective dates | (2,266)us-gaap_TreasuryStockValue | (3,401)us-gaap_TreasuryStockValue
Total common stock | 2,520,981 us-gaap_CommonStockValueOutstanding | 2,509,569 us-gaap_CommonStockValueOutstanding
Retained earnings | 1,942,194 us-gaap_RetainedEarningsAccumulatedDeficit | 1,926,065 us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss: |  |
Pension and other postretirement benefits | (57,173)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | (57,756)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Derivative instruments | (9,209)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (10,385)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Total accumulated other comprehensive loss | (66,382)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (68,141)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total shareholders’ equity | 4,396,793 us-gaap_StockholdersEquity | 4,367,493 us-gaap_StockholdersEquity
Noncontrolling interests (Note 6) | 156,214 us-gaap_MinorityInterest | 151,609 us-gaap_MinorityInterest
Total equity | 4,553,007 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 4,519,102 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND EQUITY | 14,435,703 us-gaap_LiabilitiesAndStockholdersEquity | 14,313,532 us-gaap_LiabilitiesAndStockholdersEquity
Arizona Public Service Company |  |
CURRENT ASSETS |  |
Cash and cash equivalents | 6,083 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 4,515 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Customer and other receivables | 238,863 us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 297,712 us-gaap_AccountsReceivableGrossCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Accrued unbilled revenues | 94,400 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 100,533 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Allowance for doubtful accounts | (2,560)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (3,094)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Materials and supplies (at average cost) | 221,276 us-gaap_OtherInventorySupplies / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 218,889 us-gaap_OtherInventorySupplies / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Fossil fuel (at average cost) | 44,705 us-gaap_EnergyRelatedInventoryOtherFossilFuel / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 37,097 us-gaap_EnergyRelatedInventoryOtherFossilFuel / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Assets from risk management activities (Note 7) | 13,658 us-gaap_DerivativeInstrumentsAndHedges / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 13,785 us-gaap_DerivativeInstrumentsAndHedges / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Deferred fuel and purchased power regulatory asset (Note 3) | 0 pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 6,926 pnw_DeferredFuelAndPurchasedPowerRegulatoryAssetCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other regulatory assets (Note 3) | 147,869 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 129,808 us-gaap_RegulatoryAssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Deferred income taxes | 54,789 pnw_DeferredTaxAssetsNetCurrentValue / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 55,253 pnw_DeferredTaxAssetsNetCurrentValue / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other current assets | 44,496 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 38,693 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total current assets | 863,579 us-gaap_AssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 900,117 us-gaap_AssetsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
INVESTMENTS AND OTHER ASSETS |  |
Assets from risk management activities (Note 7) | 18,444 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 17,620 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Nuclear decommissioning trust (Note 12) | 727,342 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 713,866 us-gaap_DecommissioningTrustAssetsAmount / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other assets | 33,832 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 33,362 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total investments and other assets | 779,618 pnw_TotalInvestmentsAndOtherAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 764,848 pnw_TotalInvestmentsAndOtherAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
PROPERTY, PLANT AND EQUIPMENT |  |
Plant in service and held for future use | 15,548,474 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 15,539,811 us-gaap_PropertyPlantAndEquipmentGross / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Accumulated depreciation and amortization | (5,449,753)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (5,394,650)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Net | 10,098,721 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 10,145,161 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Construction work in progress | 840,928 us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 682,807 us-gaap_ConstructionInProgressGross / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Palo Verde sale leaseback, net of accumulated depreciation (Note 6) | 120,287 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 121,255 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Intangible assets, net of accumulated amortization | 127,465 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 119,600 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Nuclear fuel, net of accumulated amortization | 136,557 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 125,201 us-gaap_NuclearFuelNetOfAmortization / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total property, plant and equipment | 11,323,958 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 11,194,024 us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
DEFERRED DEBITS |  |
Regulatory assets (Note 3) | 1,067,830 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 1,054,087 us-gaap_RegulatoryAssetsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Assets for other postretirement benefits (Note 4) | 153,156 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 149,260 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Unamortized debt issue costs | 25,948 us-gaap_UnamortizedDebtIssuanceExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 24,642 us-gaap_UnamortizedDebtIssuanceExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other | 127,190 us-gaap_OtherDeferredCostsNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 128,026 us-gaap_OtherDeferredCostsNet / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total deferred debits | 1,374,124 pnw_TotalDeferredDebits / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 1,356,015 pnw_TotalDeferredDebits / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
TOTAL ASSETS | 14,341,279 us-gaap_Assets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 14,215,004 us-gaap_Assets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
CURRENT LIABILITIES |  |
Accounts payable | 265,779 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 289,930 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Accrued taxes (Note 5) | 190,167 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 131,110 us-gaap_TaxesPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Accrued interest | 41,919 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 52,358 us-gaap_InterestPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Common dividends payable | 0 us-gaap_DividendsPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 65,800 us-gaap_DividendsPayableCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Short-term borrowings (Note 2) | 44,500 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 147,400 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Current maturities of long-term debt (Note 2) | 383,570 us-gaap_OtherLongTermDebtCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 383,570 us-gaap_OtherLongTermDebtCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Customer deposits | 72,561 us-gaap_CustomerDepositsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 72,307 us-gaap_CustomerDepositsCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Liabilities from risk management activities (Note 7) | 62,303 us-gaap_DerivativeInstrumentsAndHedgesLiabilities / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 59,676 us-gaap_DerivativeInstrumentsAndHedgesLiabilities / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Deferred fuel and purchased power regulatory liability (Note 3) | 16,359 pnw_DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 0 pnw_DeferredFuelandPurchasedPowerRegulatoryLiabilityCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Liabilities for asset retirements (Note 15) | 28,918 us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 32,462 us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other regulatory liabilities (Note 3) | 113,024 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 130,549 us-gaap_RegulatoryLiabilityCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other current liabilities | 130,161 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 167,302 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total current liabilities | 1,349,261 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 1,532,464 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
DEFERRED CREDITS AND OTHER |  |
Deferred income taxes | 2,573,876 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 2,571,365 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Regulatory liabilities (Note 3) | 1,070,106 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 1,051,196 us-gaap_RegulatoryLiabilityNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Liabilities for asset retirements (Note 15) | 379,263 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 358,288 us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Liabilities for pension benefits (Note 4) | 384,215 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 424,508 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Liabilities from risk management activities (Note 7) | 73,827 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 50,602 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Customer advances | 122,259 us-gaap_CustomerAdvancesForConstruction / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 123,052 us-gaap_CustomerAdvancesForConstruction / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Coal mine reclamation | 199,218 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 198,292 us-gaap_MineReclamationAndClosingLiabilityNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Deferred investment tax credit | 178,313 us-gaap_AccumulatedDeferredInvestmentTaxCredit / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 178,607 us-gaap_AccumulatedDeferredInvestmentTaxCredit / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Unrecognized tax benefits (Note 5) | 45,190 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 45,740 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other | 153,249 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 144,823 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total deferred credits and other | 5,179,516 us-gaap_DeferredCreditsAndOtherLiabilities / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 5,146,473 us-gaap_DeferredCreditsAndOtherLiabilities / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
COMMITMENTS AND CONTINGENCIES (SEE NOTES) |  |
EQUITY |  |
Total common stock | 178,162 us-gaap_CommonStockValueOutstanding / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 178,162 us-gaap_CommonStockValueOutstanding / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Additional paid-in capital | 2,379,696 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 2,379,696 us-gaap_AdditionalPaidInCapitalCommonStock / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Retained earnings | 1,988,587 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 1,968,718 us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Accumulated other comprehensive loss: |  |
Pension and other postretirement benefits | (37,267)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (37,948)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Derivative instruments | (9,209)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (10,385)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total accumulated other comprehensive loss | (46,476)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (48,333)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total shareholders’ equity | 4,499,969 us-gaap_StockholdersEquity / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 4,478,243 us-gaap_StockholdersEquity / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Noncontrolling interests (Note 6) | 156,214 us-gaap_MinorityInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 151,609 us-gaap_MinorityInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total equity | 4,656,183 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 4,629,852 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Long-term debt less current maturities (Note 2) | 3,156,319 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 2,906,215 us-gaap_LongTermDebtAndCapitalLeaseObligations / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total capitalization | 7,812,502 pnw_EquityAndLongTermDebtLessCurrentMaturitiesAndLeaseback / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 7,536,067 pnw_EquityAndLongTermDebtLessCurrentMaturitiesAndLeaseback / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
TOTAL LIABILITIES AND EQUITY | $ 14,341,279 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ 14,215,004 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember

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