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Long-Term Debt and Liquidity Matters - Narrative (Details)
3 Months Ended
May 04, 2021
USD ($)
Mar. 31, 2021
USD ($)
Facility
Mar. 31, 2020
USD ($)
Dec. 23, 2020
USD ($)
Dec. 17, 2020
USD ($)
May 05, 2020
USD ($)
May 04, 2020
USD ($)
Long-Term Debt and Liquidity Matters              
Repayments of lines of credit   $ 4,000,000 $ 226,690,000        
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              
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 July 2023              
Long-Term Debt and Liquidity Matters              
Outstanding letters of credit   0          
Pinnacle West | Commercial paper | Revolving credit Facility maturing July 2023              
Long-Term Debt and Liquidity Matters              
Commercial paper   $ 300,000          
Pinnacle West | Term Loan              
Long-Term Debt and Liquidity Matters              
Debt instrument, face amount           $ 31,000,000 $ 50,000,000
Variable rate   1.40%          
Long-term line of credit   $ 15,000,000          
Pinnacle West | Term Loan | Subsequent Event              
Long-Term Debt and Liquidity Matters              
Repayments of lines of credit $ 15,000,000            
APS              
Long-Term Debt and Liquidity Matters              
Repayments of lines of credit   0 $ 110,000,000        
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          
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 in 2022 and 2023              
Long-Term Debt and Liquidity Matters              
Long-term line of credit   0          
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 June 2022              
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   $ 199,500,000