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Income Taxes Income Taxes - Deferred Income Tax Liability Recognized on the Balance Sheets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Net deferred income tax liability recognized on the Consolidated Balance Sheets    
Deferred tax asset, current $ 122,232us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent $ 91,152us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term liability (2,582,636)us-gaap_DeferredTaxLiabilitiesNoncurrent (2,351,882)us-gaap_DeferredTaxLiabilitiesNoncurrent
Deferred income taxes — net (2,460,404)us-gaap_DeferredTaxAssetsLiabilitiesNet (2,260,730)us-gaap_DeferredTaxAssetsLiabilitiesNet
ARIZONA PUBLIC SERVICE COMPANY    
Net deferred income tax liability recognized on the Consolidated Balance Sheets    
Deferred tax asset, current 55,253us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Deferred tax liability, current 0us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(2,033)us-gaap_DeferredTaxLiabilitiesCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Long-term liability (2,571,365)us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(2,347,724)us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Deferred income taxes — net $ (2,516,112)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ (2,349,757)us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember