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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT- Consolidated Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current assets        
Cash and cash equivalents $ 7,604us-gaap_CashAndCashEquivalentsAtCarryingValue $ 9,526us-gaap_CashAndCashEquivalentsAtCarryingValue $ 26,202us-gaap_CashAndCashEquivalentsAtCarryingValue $ 33,583us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 297,740us-gaap_AccountsReceivableGrossCurrent 299,904us-gaap_AccountsReceivableGrossCurrent    
Income tax receivable 3,098us-gaap_IncomeTaxesReceivable 135,517us-gaap_IncomeTaxesReceivable    
Other current assets 38,817us-gaap_OtherAssetsCurrent 39,895us-gaap_OtherAssetsCurrent    
Total current assets 973,435us-gaap_AssetsCurrent 1,043,609us-gaap_AssetsCurrent    
Investments and other assets        
Other assets 54,047us-gaap_OtherAssetsNoncurrent 60,875us-gaap_OtherAssetsNoncurrent    
Total investments and other assets 785,533pnw_TotalInvestmentsAndOtherAssets 726,697pnw_TotalInvestmentsAndOtherAssets    
Total Assets 14,313,532us-gaap_Assets 13,508,686us-gaap_Assets    
Current liabilities        
Accounts payable 295,211us-gaap_AccountsPayableCurrent 284,516us-gaap_AccountsPayableCurrent    
Accrued taxes (Note 4) 140,613us-gaap_TaxesPayableCurrent 130,998us-gaap_TaxesPayableCurrent    
Common dividends payable 65,790us-gaap_DividendsPayableCurrent 62,528us-gaap_DividendsPayableCurrent    
Other current liabilities 178,962us-gaap_OtherLiabilitiesCurrent 158,540us-gaap_OtherLiabilitiesCurrent    
Total current liabilities 1,559,143us-gaap_LiabilitiesCurrent 1,618,644us-gaap_LiabilitiesCurrent    
Long-term debt less current maturities 3,031,215us-gaap_LongTermDebtNoncurrent 2,796,465us-gaap_LongTermDebtNoncurrent    
Deferred credits and other        
Deferred income taxes 2,582,636us-gaap_DeferredTaxLiabilitiesNoncurrent 2,351,882us-gaap_DeferredTaxLiabilitiesNoncurrent    
Pension and other postretirement liabilities 453,736us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 513,628us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent    
Other 188,286us-gaap_OtherLiabilitiesNoncurrent 185,659us-gaap_OtherLiabilitiesNoncurrent    
Total deferred credits and other 5,204,072us-gaap_DeferredCreditsAndOtherLiabilities 4,753,117us-gaap_DeferredCreditsAndOtherLiabilities    
Common stock equity        
Common stock 2,512,970us-gaap_CommonStockValue 2,491,558us-gaap_CommonStockValue    
Accumulated other comprehensive loss (68,141)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (78,053)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (114,008)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Retained earnings 1,926,065us-gaap_RetainedEarningsAccumulatedDeficit 1,785,273us-gaap_RetainedEarningsAccumulatedDeficit    
Total shareholders’ equity 4,367,493us-gaap_StockholdersEquity 4,194,470us-gaap_StockholdersEquity    
Noncontrolling interests 151,609us-gaap_MinorityInterest 145,990us-gaap_MinorityInterest    
Total equity 4,519,102us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 4,340,460us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 4,102,289us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,930,586us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Equity 14,313,532us-gaap_LiabilitiesAndStockholdersEquity 13,508,686us-gaap_LiabilitiesAndStockholdersEquity    
Pinnacle West        
Current assets        
Cash and cash equivalents 3,088us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,798us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
22,679us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,710us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Accounts receivable 99,958us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
80,108us-gaap_AccountsReceivableGrossCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current deferred income taxes 66,979us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
93,185us-gaap_DeferredTaxAssetsNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income tax receivable 7,329us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,853us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current assets 124us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
242us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 177,478us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
181,186us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments and other assets        
Investments in subsidiaries 4,630,570pnw_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,455,049pnw_InvestmentInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 43,051us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,789us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total investments and other assets 4,673,621pnw_TotalInvestmentsAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,468,838pnw_TotalInvestmentsAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Assets 4,851,099us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,650,024us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current liabilities        
Accounts payable 5,250us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,279us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued taxes (Note 4) 12,220us-gaap_TaxesPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
8,538us-gaap_TaxesPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Common dividends payable 65,790us-gaap_DividendsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,528us-gaap_DividendsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other current liabilities 38,992us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
31,295us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current liabilities 122,252us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
105,640us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-term debt less current maturities 125,000us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
125,000us-gaap_LongTermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred credits and other        
Deferred income taxes 12,055us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,158us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Pension and other postretirement liabilities 29,228us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37,611us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 43,462us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37,155us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total deferred credits and other 84,745us-gaap_DeferredCreditsAndOtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
78,924us-gaap_DeferredCreditsAndOtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Common stock equity        
Common stock 2,509,569us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,487,250us-gaap_CommonStockValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accumulated other comprehensive loss (68,141)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(78,053)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Retained earnings 1,926,065us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,785,273us-gaap_RetainedEarningsAccumulatedDeficit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total shareholders’ equity 4,367,493us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,194,470us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Noncontrolling interests 151,609us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
145,990us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total equity 4,519,102us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,340,460us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Liabilities and Equity $ 4,851,099us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 4,650,024us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember