Annual Rental Payments, Sale Leaseback Transaction

No definition available.

Name:	pnw_AnnualRentalPaymentsSaleLeasebackTransaction
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number Of VIE Lessor Trusts Acquired

+ References

No definition available.

+ Details

Name:	pnw_NumberOfVIELessorTrustsAcquired
Namespace Prefix:	pnw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of VIE Lessor Trusts No Longer Consolidated

+ References

No definition available.

+ Details

Name:	pnw_NumberOfVIELessorTrustsNoLongerConsolidated
Namespace Prefix:	pnw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of VIE Lessor Trusts Terminated

+ References

No definition available.

+ Details

Name:	pnw_NumberOfVIELessorTrustsTerminated
Namespace Prefix:	pnw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of VIE lessor trusts with whom agreements have been made to sell and lease back interests in certain nuclear generating assets and related common facilities.

+ References

No definition available.

+ Details

Name:	pnw_NumberOfVieLessorTrusts
Namespace Prefix:	pnw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Property, Plant And Equipment, Net, Reclassified From Sale Leaseback Transaction

+ References

No definition available.

+ Details

Name:	pnw_PropertyPlantAndEquipmentNetReclassifiedFromSaleLeasebackTransaction
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the period of lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

No definition available.

+ Details

Name:	pnw_SaleLeasebackTransactionLeaseExtensionPeriod
Namespace Prefix:	pnw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Variable Interest Entity, Acquisition Price

+ References

No definition available.

+ Details

Name:	pnw_VariableInterestEntityAcquisitionPrice
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Variable Interest Entity, Entity Initial Loss Exposure To Noncontrolling Interests During Lease Extension Period, Amount

+ References

No definition available.

+ Details

Name:	pnw_VariableInterestEntityEntityInitialLossExposureToNoncontrollingInterestsDuringLeaseExtensionPeriodAmount
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Variable Interest Entity, Entity Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount

+ References

No definition available.

+ Details

Name:	pnw_VariableInterestEntityEntityLossExposureToNoncontrollingInterestsDuringLeaseExtensionPeriodAmount
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Variable Interest Entity, Qualitative or Quantitative Information, Leased Interest Percentage

+ References

No definition available.

+ Details

Name:	pnw_VariableInterestEntityQualitativeOrQuantitativeInformationLeasedInterestPercentage
Namespace Prefix:	pnw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(18))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-6

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-1A

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481175/810-10-55-4J

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

+ Details

Name:	us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (bb)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RegulatoryAssetAxis=pnw_PaloVerdeSaleLeasebackNCIAcquisitionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pnw_ArizonaPublicServiceCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=pnw_PaloVerdeUnit2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=pnw_PinnacleWestCaptiveInsuranceCellMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Variable Interest Entities - Additional Information (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Dec. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) trust	Sep. 22, 2025 USD ($) trust	Sep. 30, 2025 USD ($) trust	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) trust	Sep. 30, 2024 USD ($)	Jun. 30, 2025 trust	Dec. 31, 2024 USD ($)	Dec. 31, 1986 trust
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				$ 4,306	$ 4,306	$ 12,918	$ 12,918
Regulatory asset		$ 1,806,935		1,806,935		1,806,935			$ 1,810,458
Palo Verde VIE acquisition (Note 8)
Palo Verde Sale Leaseback Variable Interest Entities
Regulatory asset		151,506		151,506		151,506			0
APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				4,306	4,306	12,918	12,918
Special use fund									34,200
Property, plant and equipment, net, reclassified from sale leaseback transaction		47,000		47,000		47,000
APS \| Palo Verde VIE acquisition (Note 8)
Palo Verde Sale Leaseback Variable Interest Entities
Regulatory asset		$ 152,000		152,000		152,000
Variable Interest Entity
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				1,200	0	3,600	0
Variable Interest Entity \| APS
Palo Verde Sale Leaseback Variable Interest Entities
Net income attributable to noncontrolling interest				$ 4,000	$ 4,000	$ 13,000	$ 13,000
Number of VIE lessor trusts \| trust		1	2	1		1		2		3
Number of VIE lessor trusts acquired \| trust		2		2		2
Number of VIE lessor trusts terminated \| trust		2	2	2		2
VIE, acquisition price			$ 199,000
Number of VIE lessor trusts no longer consolidated \| trust			2
Annual lease payments						$ 9,000
Variable Interest Entity \| APS \| Palo Verde Unit 2
Palo Verde Sale Leaseback Variable Interest Entities
Ownership percentage						23.90%
Leased interest percentage		5.20%
Variable Interest Entity \| APS \| Maximum
Palo Verde Sale Leaseback Variable Interest Entities
Lease period (up to)						2 years
Maximum loss exposure to the VIE's noncontrolling equity participants during lease extension period (up to)						$ 267,000
Variable Interest Entity \| APS \| Forecast
Palo Verde Sale Leaseback Variable Interest Entities
Initial loss exposure to the VIEs noncontrolling equity participants during lease extension period	$ 173,000
Variable Interest Entity \| Pinnacle West Captive Insurance Cell
Palo Verde Sale Leaseback Variable Interest Entities
Special use fund		$ 39,000		$ 39,000		$ 39,000			$ 34,000