Leases - Narrative (Details) $ in Billions	Sep. 30, 2023 USD ($) lease	Jan. 31, 2023 agreement
Leases [Abstract]
Number of lease agreements, lease and sell back \| lease	3
Number of purchase power operating lease agreements \| agreement		2
Lease not yet commenced \| $	$ 7.1

Lease Not yet Commenced, Liability, Lease and Nonlease Payments

No definition available.

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