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Long-Term Debt and Liquidity Matters - Narrative (Details)
9 Months Ended
Sep. 30, 2021
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Aug. 16, 2021
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May 28, 2021
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May 27, 2021
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creditFacility
Dec. 23, 2020
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Dec. 17, 2020
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May 05, 2020
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May 04, 2020
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Pinnacle West | Term Loan                
Long-Term Debt and Liquidity Matters                
Debt instrument, face amount         $ 150,000,000   $ 31,000,000 $ 50,000,000
Variable rate 1.40%              
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing July 2023                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility       $ 200,000,000        
Pinnacle West | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility     $ 200,000,000          
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     300,000,000          
Long-term line of credit $ 0              
Pinnacle West | Letter of Credit | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Outstanding letters of credit 0              
Pinnacle West | Commercial paper | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Commercial paper 0              
APS                
Long-Term Debt and Liquidity Matters                
Percentage of capitalization           7.00%    
Capacity available for trade purchases           $ 500,000,000    
Long-term debt limit           $ 7,500,000,000    
APS | Unsecured Debt                
Long-Term Debt and Liquidity Matters                
Debt instrument, face amount   $ 450,000,000            
Debt instrument, interest rate   2.20%            
APS | Revolving Credit Facility | Revolving Credit Facility Maturing July 2023                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility       $ 500,000,000        
APS | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility     1,000,000,000          
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     1,400,000,000          
APS | Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023                
Long-Term Debt and Liquidity Matters                
Long-term line of credit 0              
Number of line of credit facilities | creditFacility       2        
APS | Revolving Credit Facility | Revolving Credit Facility Maturing June 2022                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility       $ 500,000,000        
APS | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026, Facility One                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility     500,000,000          
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     700,000,000          
APS | Revolving Credit Facility | Revolving Credit Facility Maturing May 2026, Facility Two                
Long-Term Debt and Liquidity Matters                
Current borrowing capacity on credit facility     500,000,000          
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     700,000,000          
APS | Letter of Credit | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Outstanding letters of credit 0              
APS | Commercial paper                
Long-Term Debt and Liquidity Matters                
Maximum commercial paper support available under credit facility     $ 750,000,000          
APS | Commercial paper | Revolving Credit Facility Maturing May 2026                
Long-Term Debt and Liquidity Matters                
Commercial paper $ 125,000,000