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Palo Verde Sale Leaseback Variable Interest Entities Palo Verde Leaseback Variable Interest Entities - Schedule of VIEs (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation $ 121,255us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets $ 125,125us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Current maturities of long-term debt (Note 6) 383,570us-gaap_OtherLongTermDebtCurrent 540,424us-gaap_OtherLongTermDebtCurrent
Equity - noncontrolling interests 151,609us-gaap_MinorityInterest 145,990us-gaap_MinorityInterest
ARIZONA PUBLIC SERVICE COMPANY    
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 121,255us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
125,125us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Current maturities of long-term debt (Note 6) 383,570us-gaap_OtherLongTermDebtCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
540,424us-gaap_OtherLongTermDebtCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Equity - noncontrolling interests 151,609us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
145,990us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
ARIZONA PUBLIC SERVICE COMPANY | Consolidation of VIEs    
Amounts relating to the VIEs included in Condensed Consolidated Balance Sheets    
Palo Verde sale leaseback property plant and equipment, net of accumulated depreciation 121,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
125,000us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Current maturities of long-term debt (Note 6) 13,000us-gaap_OtherLongTermDebtCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
26,000us-gaap_OtherLongTermDebtCurrent
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Long-term debt excluding current maturities 0pnw_SaleLeasebackLessorNotes
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
13,000pnw_SaleLeasebackLessorNotes
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Equity - noncontrolling interests $ 152,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 146,000us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember