Leases - Additional information (Details) $ in Billions	Dec. 31, 2021 USD ($) Counterparty
Leases [Abstract]
Number of lease agreements, sell and lease back \| Counterparty	3
Lease not yet commenced \| $	$ 1.3

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