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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.

No definition available.

Name:	pnw_SaleLeasebackTransactionLeasePeriod
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the number of leases under which assets are retained through a specified period.

No definition available.

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Data Type:	xbrli:integerItemType
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Variable Interest Entity, Entity Initial Loss Exposure to Noncontrolling Interests During Lease Extension Period, Amount

No definition available.

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

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

No definition available.

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

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The yearly payments due under the 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.

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Name:	us-gaap_SaleLeasebackTransactionAnnualRentalPayments
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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.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Data Type:	na
Balance Type:
Period Type:

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

Name:	pnw_SaleLeasebackTransactionPeriodAxis=pnw_SaleLeasebackTransactionPeriodThrough2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	pnw_SaleLeasebackTransactionPeriodAxis=pnw_SaleLeasebackTransactionPeriodThrough2033Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	pnw_SaleLeasebackTransactionPeriodAxis=pnw_SaleLeasebackTransactionPeriod2017Through2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	pnw_SaleLeasebackTransactionPeriodAxis=pnw_SaleLeasebackTransactionPeriod2024Through2033Member
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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