v3.26.1
Debt and Liquidity Matters - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 05, 2026
Dec. 03, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jul. 31, 2026
Jul. 30, 2026
Mar. 10, 2026
Commercial paper                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Repayments of short-term debt $ 50,000                
APS                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Equity infusion from Pinnacle West 100,000   $ 100,000 $ 300,000 $ 100,000 $ 300,000      
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        
APS | ACC | Subsequent Event                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Long term debt authorization             $ 12,000,000 $ 9,500,000  
Senior Unsecured Noted Maturing June 2029 | Senior Notes                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Debt issued $ 500,000                
Interest rate 4.65%                
Senior Unsecured Notes Maturing June 2026 | Senior Notes                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Repayments of senior debt $ 350,000                
Senior Unsecured Notes Maturing March 2036 | APS | Senior Notes                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Debt issued                 $ 600,000
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     $ 1,700,000   $ 1,700,000        
Accordion feature, increase increment     400,000   400,000        
Accordion feature, increase limit     2,100,000   2,100,000        
Long-term line of credit     $ 0   $ 0        
Debt, weighted average interest rate     3.92%   3.92%        
Letter of Credit | APS                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Outstanding letters of credit     $ 30,400   $ 30,400        
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     1,500,000   1,500,000        
Commercial paper | Revolving Credit Facility Maturing April 2029 | APS                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Commercial paper     540,000   $ 540,000        
Pinnacle West Consolidated | Term Loan Facility Maturing December 3, 2026                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Debt instrument term         364 days        
Debt issued     175,000   $ 175,000        
Debt instrument, basis spread on variable rate         0.80%        
Loan amount drawn   $ 175,000              
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     300,000   $ 300,000        
Accordion feature, increase increment     100,000   100,000        
Accordion feature, increase limit     400,000   400,000        
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     300,000   300,000        
Commercial paper     $ 104,000   $ 104,000        
Debt, weighted average interest rate     3.85%   3.85%