Debt and Liquidity Matters - Additional Information (Details) - USD ($) $ in Thousands					3 Months Ended		6 Months Ended
	May 15, 2025	Apr. 29, 2025	Dec. 20, 2024	Dec. 05, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
APS
Long-Term Debt and Liquidity Matters [Line Items]
Equity infusion from Pinnacle West	$ 300,000				$ 300,000	$ 450,000	$ 300,000	$ 450,000
Public utilities, request to permanently modify permitted yearly equity infusions							2.50%
Public utilities, number of basis point of approved rate					0.0050		0.0050
Term Loan | APS
Long-Term Debt and Liquidity Matters [Line Items]
Debt instrument term				364 days
Debt instrument, face amount				$ 400,000
Debt instrument, basis spread on variable rate				0.90%
Proceeds from issuance of unsecured debt		$ 400,000
Senior Notes Maturing May 2025 | Senior Notes | APS
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	3.15%
Repayments of unsecured debt	$ 300,000
Revolving credit facility | Revolving Credit Facility Maturing April 2029 | APS
Long-Term Debt and Liquidity Matters [Line Items]
Current borrowing capacity on credit facility					$ 1,250,000		$ 1,250,000
Accordion feature, increase limit					400,000		400,000
Long-term line of credit					$ 0		$ 0
Debt, weighted average interest rate					4.58%		4.58%
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders					$ 1,650,000		$ 1,650,000
Letter of Credit | APS
Long-Term Debt and Liquidity Matters [Line Items]
Outstanding letters of credit					29,200		29,200
Letter of Credit | Revolving Credit Facility Maturing April 2029 | APS
Long-Term Debt and Liquidity Matters [Line Items]
Outstanding letters of credit					0		0
Commercial paper | APS
Long-Term Debt and Liquidity Matters [Line Items]
Maximum commercial paper support available under credit facility					1,000,000		1,000,000
Commercial paper | Revolving Credit Facility Maturing April 2029 | APS
Long-Term Debt and Liquidity Matters [Line Items]
Commercial paper					725,000		$ 725,000
Pinnacle West | Term Loan
Long-Term Debt and Liquidity Matters [Line Items]
Debt instrument term							364 days
Debt instrument, face amount					200,000		$ 200,000
Loan amount drawn			$ 200,000
Debt instrument, basis spread on variable rate							0.95%
Pinnacle West | Senior Unsecured Notes Maturing May 2028 | Senior Notes
Long-Term Debt and Liquidity Matters [Line Items]
Debt instrument, face amount	$ 400,000
Interest rate	4.90%
Pinnacle West | Senior Unsecured Notes Maturing May 2030 | Senior Notes
Long-Term Debt and Liquidity Matters [Line Items]
Debt instrument, face amount	$ 400,000
Interest rate	5.15%
Pinnacle West | Senior Unsecured Notes Maturing May 2025 | Senior Notes
Long-Term Debt and Liquidity Matters [Line Items]
Interest rate	1.30%
Repayments of unsecured debt	$ 500,000
Pinnacle West | Revolving credit facility | Revolving Credit Facility Maturing April 2029
Long-Term Debt and Liquidity Matters [Line Items]
Current borrowing capacity on credit facility					200,000		$ 200,000
Accordion feature, increase limit					300,000		300,000
Long-term line of credit					0		0
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing April 2029
Long-Term Debt and Liquidity Matters [Line Items]
Outstanding letters of credit					0		0
Pinnacle West | Commercial paper | Revolving Credit Facility Maturing April 2029
Long-Term Debt and Liquidity Matters [Line Items]
Commercial paper					$ 80,000		$ 80,000
Debt, weighted average interest rate					4.59%		4.59%