Sale Of Stock, Expected Number Of Shares To Be Issued In Transaction

No definition available.

Name:	pnw_SaleOfStockExpectedNumberOfSharesToBeIssuedInTransaction
Namespace Prefix:	pnw_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Sale Of Stock, Outstanding Agreement, Value Of Shares Expected To Be Issued In Transaction

+ References

No definition available.

+ Details

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

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_ATMProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_November2024ATMForwardSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_March2025ATMForwardSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_August2025ATMForwardSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_September2025ATMForwardSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_January2026ATMForwardSaleAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_March2026ATMForwardSaleAgreementDueSeptember32027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_March2026ATMForwardSaleAgreementDueSeptember102027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_March2026ATMForwardSaleAgreementDueSeptember182027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_March2026ATMForwardSaleAgreementDueSeptember302027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=pnw_February2024ForwardSaleAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Common Stock Equity and Earnings Per Share - Schedule of ATM Program (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended
	Dec. 18, 2025	Sep. 04, 2025	Dec. 23, 2024	Feb. 28, 2024	Mar. 31, 2026	Nov. 08, 2024
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					4,861,922
Forward Sales Price Per Share (in dollars per share)					$ 95.08
Aggregate Value					$ 462,269
ATM Program
Subsidiary or Equity Method Investee [Line Items]
Initial Price, Aggregate Value					$ 434,000	$ 900,000
November 2024
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					552,833
Forward Sales Price Per Share (in dollars per share)					$ 89.73
Aggregate Value					$ 49,606
March 2025
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					544,959
Forward Sales Price Per Share (in dollars per share)					$ 90.83
Aggregate Value					$ 49,499
August 2025
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					543,001
Forward Sales Price Per Share (in dollars per share)					$ 91.21
Aggregate Value					$ 49,527
September 2025
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					558,622
Forward Sales Price Per Share (in dollars per share)					$ 88.69
Aggregate Value					$ 49,544
January 2026
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					119,553
Forward Sales Price Per Share (in dollars per share)					$ 89.88
Aggregate Value					$ 10,745
March 2026
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					646,674
Forward Sales Price Per Share (in dollars per share)					$ 99.52
Aggregate Value					$ 64,357
March 2026
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					490,537
Forward Sales Price Per Share (in dollars per share)					$ 100.94
Aggregate Value					$ 49,515
March 2026
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					488,813
Forward Sales Price Per Share (in dollars per share)					$ 101.28
Aggregate Value					$ 49,507
March 2026
Subsidiary or Equity Method Investee [Line Items]
Number of Shares (in shares)					916,930
Forward Sales Price Per Share (in dollars per share)					$ 98.12
Aggregate Value					$ 89,969
February 2024 Forward Sale Agreements
Subsidiary or Equity Method Investee [Line Items]
Initial Price, Number of Shares (in shares)				11,240,601
Initial Price, Aggregate Value				$ 725,131
Number of Shares (in shares)	1,193,950	243,186	5,377,115
Forward Sales Price Per Share (in dollars per share)	$ 62.82	$ 63.12	$ 64.17	$ 64.51
Aggregate Value	$ 75,004	$ 15,350	$ 345,049