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Long-Term Debt and Liquidity Matters - Narrative (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
Facility
May 27, 2021
USD ($)
Facility
Dec. 23, 2020
USD ($)
Dec. 17, 2020
USD ($)
May 05, 2020
USD ($)
May 04, 2020
USD ($)
Long-Term Debt and Liquidity Matters            
Percentage of capitalization       7.00%    
Capacity available for trade purchases       $ 500,000,000    
Term Loan            
Long-Term Debt and Liquidity Matters            
Debt instrument, face amount     $ 150,000,000      
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            
Long-term line of credit $ 0          
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          
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 $ 9,700,000          
Pinnacle West | Term Loan            
Long-Term Debt and Liquidity Matters            
Debt instrument, face amount         $ 31,000,000 $ 50,000,000
Variable rate 1.40%          
APS            
Long-Term Debt and Liquidity Matters            
Long-term debt limit       $ 7,500,000,000    
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          
Number of line of credit facilities | Facility 2          
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 | Facility   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 in 2022 and 2023            
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 in 2022 and 2023            
Long-Term Debt and Liquidity Matters            
Commercial paper $ 495,000,000