XML 95 R73.htm IDEA: XBRL DOCUMENT
v3.21.2

Leases - Narrative (Details) $ in Millions | Jun. 30, 2021 USD ($) Lease
--- | ---
Leases [Abstract] |
Number of lease agreements, lease and sell back | Lease | 3
Lease not yet commenced | $ | $ 392

X
- Definition Lease Not yet Commenced, Liability, Lease and Nonlease Payments + References No definition available. + Details
Name: | pnw_LeaseNotyetCommencedLiabilityLeaseandNonleasePayments
Namespace Prefix: | pnw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number Of Lease Agreements, Lease And Sell Back + References No definition available. + Details
Name: | pnw_NumberOfLeaseAgreementsLeaseAndSellBack
Namespace Prefix: | pnw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration