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Long-Term Debt and Liquidity Matters - Narrative (Details)
May 09, 2019
USD ($)
Mar. 01, 2019
USD ($)
Feb. 26, 2019
USD ($)
Jun. 30, 2019
USD ($)
Facility
May 08, 2019
USD ($)
Feb. 28, 2019
USD ($)
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing June 2019            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)         $ 150,000,000  
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    
Current borrowing capacity on credit facility       200,000,000    
Long-term line of credit       0    
Pinnacle West | Term Loan            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to) $ 50,000,000          
Long-term line of credit       46,000,000    
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       10,000,000    
APS | Term Loan            
Long-Term Debt and Liquidity Matters            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     $ 200,000,000      
APS | Senior notes            
Long-Term Debt and Liquidity Matters            
Debt instrument, face amount           $ 300,000,000
Debt instrument, interest rate   8.75%       4.25%
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 | Term Loan Facility            
Long-Term Debt and Liquidity Matters            
Extinguishment of debt   $ 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    
Current borrowing capacity on credit facility       1,000,000,000    
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            
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       $ 377,000,000    
LIBOR | Pinnacle West | Term Loan            
Long-Term Debt and Liquidity Matters            
Debt instrument, basis spread on variable rate 0.55%          
LIBOR | APS | Term Loan            
Long-Term Debt and Liquidity Matters            
Debt instrument, basis spread on variable rate     0.50%