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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 423,696us-gaap_ProfitLoss $ 439,966us-gaap_ProfitLoss $ 413,164us-gaap_ProfitLoss
Derivative instruments:      
Net unrealized loss, net of tax benefit (expense) (810)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (213)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (22,763)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of net realized loss, net of tax benefit 13,483us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 26,747us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 59,887us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Pension and other postretirement benefits activity, net of tax benefit (expense) (2,761)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 9,421us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 1,031us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total other comprehensive income 9,912us-gaap_OtherComprehensiveIncomeLossNetOfTax 35,955us-gaap_OtherComprehensiveIncomeLossNetOfTax 38,155us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME 433,608us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 475,921us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 451,319us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Net income attributable to noncontrolling interests (Note 18) 26,101us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 33,892us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 31,622us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS 407,507us-gaap_ComprehensiveIncomeNetOfTax 442,029us-gaap_ComprehensiveIncomeNetOfTax 419,697us-gaap_ComprehensiveIncomeNetOfTax
ARIZONA PUBLIC SERVICE COMPANY      
Net income 447,320us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
458,861us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
427,110us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Derivative instruments:      
Net unrealized loss, net of tax benefit (expense) (809)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(214)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(22,775)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Reclassification of net realized loss, net of tax benefit 13,483us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
26,747us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
59,888us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Pension and other postretirement benefits activity, net of tax benefit (expense) (7,635)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
9,190us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
(617)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Total other comprehensive income 5,039us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
35,723us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
36,496us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
COMPREHENSIVE INCOME 452,359us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
494,584us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
463,606us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
Less: Net income attributable to noncontrolling interests (Note 18) 26,101us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
33,892us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
31,613us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS $ 426,258us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ 460,692us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember
$ 431,993us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= pnw_ArizonaPublicServiceCompanyMember