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Long-Term Debt and Liquidity Matters - Narrative (Details)
3 Months Ended
Jan. 15, 2020
USD ($)
Mar. 31, 2020
USD ($)
Facility
May 05, 2020
USD ($)
May 04, 2020
USD ($)
Mar. 26, 2020
USD ($)
Nov. 27, 2018
USD ($)
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        
Pinnacle West | Revolving Credit Facility | Revolving credit Facility maturing July 2023            
Long-Term Debt and Liquidity Matters            
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   100,000,000        
Current borrowing capacity on credit facility   200,000,000        
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   0        
Pinnacle West | Term Loan [Member]            
Long-Term Debt and Liquidity Matters            
Long-term line of credit   $ 33,000,000        
Variable rate   1.40%        
APS            
Long-Term Debt and Liquidity Matters            
Long-term debt limit         $ 5,900,000,000  
APS | Senior Unsecured Notes [Member] | Senior notes            
Long-Term Debt and Liquidity Matters            
Debt instrument, face amount $ 250,000,000          
Extinguishment of debt $ 150,000,000          
APS | Revolving Credit Facility | Revolving credit Facility maturing July 2023            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)   $ 700,000,000        
Current borrowing capacity on credit facility   500,000,000        
APS | Revolving Credit Facility | Revolving Credit Facility Maturing in 2022 and 2023            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)   1,400,000,000        
Long-term line of credit   430,000,000        
Current borrowing capacity on credit facility   $ 1,000,000,000        
Number of line of credit facilities | Facility   2        
APS | Revolving Credit Facility | Revolving credit facility maturing June 2022            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)   $ 700,000,000        
Current borrowing capacity on credit facility   500,000,000        
APS | Commercial paper            
Long-Term Debt and Liquidity Matters            
Maximum commercial paper support available under credit facility   500,000,000        
APS | Commercial paper | Revolving Credit Facility Maturing in 2022 and 2023            
Long-Term Debt and Liquidity Matters            
Commercial paper   $ 0        
Minimum | APS | Senior Unsecured Notes [Member]            
Long-Term Debt and Liquidity Matters            
Debt instrument, interest rate 2.20%          
Subsequent Event | Pinnacle West | Term Loan [Member]            
Long-Term Debt and Liquidity Matters            
Debt instrument, face amount     $ 31,000,000 $ 50,000,000