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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Trust
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 1986
Trust
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
2015 $ 18us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent      
2016 6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears      
2017 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears      
2018 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears      
2019 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears      
Thereafter 63us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter      
Total future lease commitments 99us-gaap_OperatingLeasesFutureMinimumPaymentsDue      
Lease expense 18us-gaap_LeaseAndRentalExpense 18us-gaap_LeaseAndRentalExpense 19us-gaap_LeaseAndRentalExpense  
APS        
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
2015 15us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
2016 6us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
2017 5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
2018 4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
2019 3us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
Thereafter 62us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
Total future lease commitments 95us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
     
Lease expense $ 15us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ 15us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ 16us-gaap_LeaseAndRentalExpense
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
 
Number of VIE lessor trusts 3pnw_NumberOfVIELessorTrusts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
    3pnw_NumberOfVIELessorTrusts
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Palo Verde Lessor Trusts        
Estimated future minimum lease payments for operating leases, excluding purchased power agreements        
Number of VIE lessor trusts       3pnw_NumberOfVIELessorTrusts
/ dei_LegalEntityAxis
= pnw_PaloVerdeLessorTrustsMember