Debt and Liquidity Matters - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended
	Dec. 03, 2025	Mar. 31, 2026	Mar. 10, 2026
APS
Long-Term Debt and Liquidity Matters [Line Items]
Public utilities, request to permanently modify permitted yearly equity infusions		2.50%
Public utilities, number of basis point of approved rate		0.0050
Senior Unsecured Notes Maturing March 2036 | APS | Senior Notes
Long-Term Debt and Liquidity Matters [Line Items]
Notes issued			$ 600.0
Interest rate			5.10%
Revolving credit facility | Revolving Credit Facility Maturing April 2029 | APS
Long-Term Debt and Liquidity Matters [Line Items]
Current borrowing capacity on credit facility		$ 1,700.0
Accordion feature, increase increment		400.0
Accordion feature, increase limit		2,100.0
Long-term line of credit		$ 0.0
Debt, weighted average interest rate		3.96%
Letter of Credit | APS
Long-Term Debt and Liquidity Matters [Line Items]
Outstanding letters of credit		$ 31.8
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		1,500.0
Commercial paper | Revolving Credit Facility Maturing April 2029 | APS
Long-Term Debt and Liquidity Matters [Line Items]
Commercial paper		$ 316.0
Pinnacle West Consolidated | Term Loan Facility Maturing December 3, 2026
Long-Term Debt and Liquidity Matters [Line Items]
Debt instrument term		364 days
Notes issued		$ 175.0
Debt instrument, basis spread on variable rate		0.80%
Loan amount drawn	$ 175.0
Pinnacle West Consolidated | Revolving credit facility | Revolving Credit Facility Maturing April 2029
Long-Term Debt and Liquidity Matters [Line Items]
Current borrowing capacity on credit facility		$ 300.0
Accordion feature, increase increment		100.0
Accordion feature, increase limit		400.0
Long-term line of credit		0.0
Pinnacle West Consolidated | 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 Consolidated | Commercial paper | Revolving Credit Facility Maturing April 2029
Long-Term Debt and Liquidity Matters [Line Items]
Current borrowing capacity on credit facility		300.0
Commercial paper		$ 103.0
Debt, weighted average interest rate		3.93%