Amount of Adjustment Representing Prorated Sales Losses Pending Approval

No definition available.

Name:	pnw_AmountofAdjustmentRepresentingProratedSalesLossesPendingApproval
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Approved PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_ApprovedPSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Customer Support Fund, Past Due Balance Threshold

+ References

No definition available.

+ Details

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

- Definition

Forward Component Of PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_ForwardComponentOfPSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Historical Component Of PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_HistoricalComponentOfPSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (Decrease) In Amount Of Adjustment Representing Annual Recovery

+ References

No definition available.

+ Details

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

- Definition

Maximum Increase Decrease in PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_MaximumIncreaseDecreaseinPSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_PSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

PSA Rate In Prior Years1

+ References

No definition available.

+ Details

Name:	pnw_PSARateInPriorYears1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Public Utilities, Approved Rate, Amount Of Customer Refunds

+ References

No definition available.

+ Details

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

- Definition

Represents information pertaining to cap percentage of retail revenues.

+ References

No definition available.

+ Details

Name:	pnw_RateMatterCapPercentageOfRetailRevenue
Namespace Prefix:	pnw_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The period of time covered by a plan to implement a standard enacted by a regulatory authority.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of proposed budget.

+ References

No definition available.

+ Details

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

- Definition

Rate Matter, Request Third-Year Energy Price For Exported Energy1

+ References

No definition available.

+ Details

Name:	pnw_RateMatterRequestThirdYearEnergyPriceForExportedEnergy1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate Matter, Proposed BudgetUpdated

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Cost Of Service, Resource Comparison Proxy Method, Maximum Annual Percentage Decrease

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Court Resolution Surcharge Cap Rate1

+ References

No definition available.

+ Details

Name:	pnw_RateMattersCourtResolutionSurchargeCapRate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate Matters, Decrease In Commercial Rates, Power

+ References

No definition available.

+ Details

Name:	pnw_RateMattersDecreaseInCommercialRatesPower
Namespace Prefix:	pnw_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate Matters, Increase (Decrease) In Cost Recovery

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Increase (Decrease) In Cost Recovery, Retail Customer Rates

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Increase (Decrease) in Cost Recovery, Wholesale Customer Rates

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Increase (Decrease) In Retail Revenue Requirements

+ References

No definition available.

+ Details

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

- Definition

Rate Matters, Increase In Residential And Commercial Rates, Power

+ References

No definition available.

+ Details

Name:	pnw_RateMattersIncreaseInResidentialAndCommercialRatesPower
Namespace Prefix:	pnw_
Data Type:	dtr-types:powerItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate Matters, Resource Comparison Proxy Method, Rate Lock Period

+ References

No definition available.

+ Details

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

- Definition

Regulatory Clause, Deferred Fuel And Purchased Power Costs, Balancing Account, Reporting Threshold Amount

+ References

No definition available.

+ Details

Name:	pnw_RegulatoryClauseDeferredFuelAndPurchasedPowerCostsBalancingAccountReportingThresholdAmount
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs

+ References

No definition available.

+ Details

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

- Definition

Regulatory Matters, Requested Rate Increase, Lost Revenue Recovery And Ongoing Costs Collected

+ References

No definition available.

+ Details

Name:	pnw_RegulatoryMattersRequestedRateIncreaseLostRevenueRecoveryAndOngoingCostsCollected
Namespace Prefix:	pnw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Transition Component Of PSA Rate1

+ References

No definition available.

+ Details

Name:	pnw_TransitionComponentOfPSARate1
Namespace Prefix:	pnw_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- 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

No definition available.

+ Details

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

- Details

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

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_DamageFromFireExplosionOrOtherHazardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_ArizonaRenewableEnergyStandardAndTariffMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=pnw_ArizonaCorporationCommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_ArizonaRenewableEnergyStandardandTariff2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_DemandSideManagementAdjustorCharge2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_RenewableEnergyAdjustmentChargeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_DemandSideManagementAdjustorCharge2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_PowerSupplyAdjustorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pnw_PublicUtilitiesRegulatoryRegulatoryMattersAxis=pnw_CostRecoveryMechanismsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_OpenAccessTransmissionTariffMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=pnw_UnitedStatesFederalEnergyRegulatoryCommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_LostFixedCostRecoveryMechanismsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_CourtResolutionSurchargeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_NetMeteringMember
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:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=pnw_A2027RESImplementationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Regulatory Matters - Cost Recovery Mechanisms (Details) - APS														6 Months Ended	12 Months Ended
	Sep. 01, 2026 $ / kWh	Jul. 31, 2026 USD ($)	Jun. 01, 2026 USD ($)	Nov. 26, 2025 $ / kWh	Aug. 14, 2025 $ / kWh	Jul. 31, 2025 USD ($)	Jun. 01, 2025 USD ($)	Nov. 27, 2024 $ / kWh	Aug. 13, 2024 $ / kWh	Jul. 31, 2024 USD ($)	Jun. 01, 2024 USD ($) MW	Oct. 11, 2023	Jul. 01, 2023 USD ($) $ / KWH_Kilowatt_hour	Jun. 30, 2026 USD ($) $ / kWh	Dec. 31, 2022 USD ($) $ / kWh	Dec. 31, 2021 $ / kWh	Jul. 01, 2026 USD ($)	Dec. 03, 2025 USD ($)	Aug. 31, 2025 USD ($)	Jul. 01, 2025 USD ($)	Jun. 30, 2025 USD ($)	Apr. 22, 2025 USD ($)	Jul. 01, 2024 USD ($)	Nov. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Nov. 30, 2022 USD ($)	Jul. 01, 2022 USD ($)
Damage from Fire, Explosion or Other Hazard
Public Utilities, General Disclosures [Line Items]
Past due balance threshold qualifying for payment extension														$ 75
Arizona Renewable Energy Standard and Tariff \| ACC
Public Utilities, General Disclosures [Line Items]
Plan term														5 years
Arizona Renewable Energy Standard and Tariff 2018 \| ACC
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																				$ 110,100,000			$ 92,700,000		$ 95,100,000			$ 86,200,000
Demand Side Management Adjustor Charge 2024 \| ACC
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																								$ 91,500,000
Approved rate, amount of customer refunds						$ 7,600,000													$ 7,600,000			$ 9,000,000
Rate matter, updated budget																		$ 40,000,000			$ 90,900,000
Renewable Energy Adjustment Charge \| ACC
Public Utilities, General Disclosures [Line Items]
Approved rate, amount of customer refunds																			$ 44,200,000			$ 43,000,000
Demand Side Management Adjustor Charge 2023 \| ACC
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																										$ 88,000,000	$ 88,000,000
Power Supply Adjustor (PSA) \| ACC
Public Utilities, General Disclosures [Line Items]
PSA rate (in dollars per kWh) \| $ / kWh				0.016977				0.013977							0.006
Reporting threshold of balancing account															$ 100,000,000
Overall approved PSA rate (in dollars per kWh) \| $ / kWh															0.011977
Forward component of PSA rate (in dollars per kWh) \| $ / kWh				0.012457				(0.000281)							(0.012624)
Historical component of PSA rate (in dollars per kWh) \| $ / kWh				0.00452				0.008728							0.013071
Transition component of PSA rate \| $ / kWh				0				0.005530							0.011530
Power Supply Adjustor (PSA) \| ACC \| Cost Recovery Mechanisms
Public Utilities, General Disclosures [Line Items]
Maximum increase decrease in PSA rate (in dollars per kWh) \| $ / kWh				0.006				0.006						0.006
PSA rate in prior years (in dollars per kWh) \| $ / kWh				0.003				0.002								0.004
Transmission rates, transmission cost adjustor and other transmission matters \| FERC
Public Utilities, General Disclosures [Line Items]
Rate matters, increase (decrease) In cost recovery			$ 13,100,000				$ 119,000,000.0				$ 27,400,000
Rate matters, increase (decrease) in cost recovery, wholesale customer rates			1,500,000				4,600,000				16,600,000
Rate matters, increase (decrease) in cost recovery, retail customer rates			11,600,000				114,400,000				10,800,000
Rate matters, increase (decrease) In retail revenue requirements			$ 20,600,000				$ 88,300,000				$ 8,800,000
Rate matters, increase in residential and commercial rates (in MW) \| MW											3
Rate matters, decrease in commercial rates (in MW) \| MW											3
Lost Fixed Cost Recovery Mechanism
Public Utilities, General Disclosures [Line Items]
Rate matter cap percentage of retail revenue														1.00%
Amount of adjustment approved representing prorated sales losses pending approval						60,100,000				$ 49,600,000
Amount of adjustment representing annual recovery						$ 10,500,000				$ 8,000,000
Lost Fixed Cost Recovery Mechanism \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount of adjustment approved representing prorated sales losses pending approval		$ 72,500,000
Amount of adjustment representing annual recovery		$ 12,400,000
Court Resolution Surcharge \| ACC
Public Utilities, General Disclosures [Line Items]
Court resolution surcharge (in dollars per kWh) \| $ / KWH_Kilowatt_hour													0.00175
Lost revenue recovery													$ 59,600,000
Lost revenue recovery collected														$ 51,600,000
Net Metering \| ACC
Public Utilities, General Disclosures [Line Items]
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease					10.00%				10.00%			10.00%		10.00%
Third-year export energy price (in dollars per kWh) \| $ / kWh					0.06171				0.06857
Rate lock period												10 years
Net Metering \| ACC \| Forecast
Public Utilities, General Disclosures [Line Items]
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease	10.00%
Third-year export energy price (in dollars per kWh) \| $ / kWh	0.05554
2027 RES Implementation Plan \| ACC \| Subsequent Event
Public Utilities, General Disclosures [Line Items]
Amount of proposed budget																	$ 120,900,000