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Long-Term Debt and Liquidity Matters (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 10, 2014
Series
Jun. 18, 2014
Dec. 30, 2013
Jul. 12, 2013
Oct. 11, 2013
May 01, 2014
May 14, 2014
Sep. 23, 2014
Jun. 01, 2014
May 30, 2014
Oct. 01, 2014
May 08, 2014
May 09, 2014
Jan. 12, 2015
Long-Term Debt and Liquidity Matters [Line Items]                                  
Repayments of long-term debt $ 652,578,000us-gaap_RepaymentsOfLongTermDebt $ 122,828,000us-gaap_RepaymentsOfLongTermDebt $ 654,286,000us-gaap_RepaymentsOfLongTermDebt                            
Debt Provisions                                  
Total shareholder equity 4,367,493,000us-gaap_StockholdersEquity 4,194,470,000us-gaap_StockholdersEquity                              
ARIZONA PUBLIC SERVICE COMPANY                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Gross long-term debt 3,294,000,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                               
Repayments of long-term debt 527,578,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
122,828,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
529,286,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                           
Debt Provisions                                  
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) 45.00%pnw_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatioActual
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                               
Total shareholder equity 4,478,243,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
4,308,884,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                             
ARIZONA PUBLIC SERVICE COMPANY | SCE | Four Corners Units 4 and 5                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Ownership interest acquired       48.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= pnw_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= pnw_FourCornersUnits4And5Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
  48.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= pnw_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= pnw_FourCornersUnits4And5Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                     
Number of tax-exempt indebtedness series re-acquired       2pnw_DebtInstrumentNumberOfTaxExemptIndebtednessSeriesReacquired
/ us-gaap_BusinessAcquisitionAxis
= pnw_SouthernCaliforniaEdisonCompanyMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= pnw_FourCornersUnits4And5Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                         
ARIZONA PUBLIC SERVICE COMPANY | Pollution control revenue refunding bonds, 1994 series A                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Gross long-term debt             33,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds1994SeriesAMember
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                   
ARIZONA PUBLIC SERVICE COMPANY | Pollution control revenue refunding bonds, 1994 series C                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Gross long-term debt               32,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds1994SeriesCMember
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                 
ARIZONA PUBLIC SERVICE COMPANY | 4.70% unsecured senior notes that mature on January 15, 2044                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued       250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes4.7PercentDue2044Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                         
Interest rate (as a percent)       4.70%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes4.7PercentDue2044Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                         
Pinnacle West                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Gross long-term debt 3,419,000,000us-gaap_DebtInstrumentCarryingAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                               
Repayments of long-term debt 125,000,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
125,000,000us-gaap_RepaymentsOfLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                           
Debt Provisions                                  
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) 46.00%pnw_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatioActual
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                               
Total shareholder equity 4,367,493,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,194,470,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                             
Line of credit | Pinnacle West | Term loan facility matures on 31 December, 2017                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued 125,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_TermLoanFacilityMatureson31December2017Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                               
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Pollution control revenue refunding bonds, 2009 series A, series D and series E                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Principal balance repaid                 100,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds2009SeriesASeriesDAndSeriesEMember
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
               
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Series A bonds 2009                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued                   36,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_SeriesABonds2009Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
             
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Series D and series E bonds 2009                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Debt Instrument expected to be Issued in the next 12 months 64,000,000pnw_DebtInstrumentExpectedtobeIssuedintheNext12Months
/ us-gaap_DebtInstrumentAxis
= pnw_SeriesDAndSeriesEBonds2009Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
                               
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Pollution control revenue refunding bonds 2009 series A due 2034                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued                     38,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds2009SeriesADue2034Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
13,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds2009SeriesADue2034Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
         
Principal balance repaid                         38,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_PollutionControlRevenueRefundingBonds2009SeriesADue2034Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
       
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Series B and series C bonds 2009                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Principal balance repaid                       64,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_SeriesBAndSeriesCBonds2009Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
         
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Series C bonds 2009                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued                           32,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_SeriesCBonds2009Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
     
Debt instrument, bond | ARIZONA PUBLIC SERVICE COMPANY | Series B bonds 2009                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Debt Instrument expected to be Issued in the next 12 months 32,000,000pnw_DebtInstrumentExpectedtobeIssuedintheNext12Months
/ us-gaap_DebtInstrumentAxis
= pnw_SeriesBBonds2009Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= pnw_DebtInstrumentBondMember
                               
Senior notes | ARIZONA PUBLIC SERVICE COMPANY | Unsecured senior notes 3.35 percent matures on 15 June, 2024                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued         250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes3.35PercentMatureOn15June2024Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Interest rate (as a percent)         3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes3.35PercentMatureOn15June2024Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Senior notes | ARIZONA PUBLIC SERVICE COMPANY | Unsecured senior notes 5.80 percent matures on 30 June, 2014                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Interest rate (as a percent)         5.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes5.80PercentMatureOn30June2014Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Repayments of long-term debt         300,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes5.80PercentMatureOn30June2014Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                       
Revolving credit facility                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Revolving credit facility, current borrowing capacity 1,200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
1,200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
                             
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in 2016                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Revolving credit facility, current borrowing capacity   500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2016Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                        500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2016Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
   
Revolving credit facility | ARIZONA PUBLIC SERVICE COMPANY | Revolving credit facility maturing in 2019                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Revolving credit facility, current borrowing capacity 500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2019Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
                            500,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2019Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
 
Revolving credit facility | Pinnacle West | Revolving credit facility maturing in 2016                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Revolving credit facility, current borrowing capacity   200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                        200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Revolving credit facility | Pinnacle West | Revolving credit facility maturing in 2019                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Revolving credit facility, current borrowing capacity 200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
                            200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= pnw_LineOfCreditMaturingIn2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Maximum                                  
Debt Provisions                                  
Ratio of consolidated debt to consolidated capitalization (as a percent) 65.00%pnw_DebtInstrumentCovenantConsolidatedDebtToTotalConsolidatedCapitalizationRatio
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                               
ACC | ARIZONA PUBLIC SERVICE COMPANY                                  
Debt Provisions                                  
Total shareholder equity 4,500,000,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_RegulatoryAgencyAxis
= pnw_ArizonaCorporationCommissionMember
                               
Total capitalization 8,000,000,000pnw_ShareholderEquityAndLongTermDebtAndCurrentMaturities
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_RegulatoryAgencyAxis
= pnw_ArizonaCorporationCommissionMember
                               
Dividend restrictions, shareholder equity required 3,200,000,000pnw_PublicUtilityOrderDividendRestrictionsShareholderEquity
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_RegulatoryAgencyAxis
= pnw_ArizonaCorporationCommissionMember
                               
ACC | Minimum | ARIZONA PUBLIC SERVICE COMPANY                                  
Debt Provisions                                  
Required common equity ratio ordered by ACC (as a percent) 40.00%pnw_PublicUtilityOrderCommonStockholdersEquityRatio
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_RegulatoryAgencyAxis
= pnw_ArizonaCorporationCommissionMember
                               
Subsequent event | Senior notes | ARIZONA PUBLIC SERVICE COMPANY | Unsecured senior notes 2.20 percent matures on 15 January, 2020                                  
Long-Term Debt and Liquidity Matters [Line Items]                                  
Notes issued                                 $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes2.20PercentMatureon15January2020Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Interest rate (as a percent)                                 2.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= pnw_UnsecuredSeniorNotes2.20PercentMatureon15January2020Member
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember