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Long-Term Debt and Liquidity Matters - Narrative (Details)
3 Months Ended
Mar. 01, 2019
USD ($)
Feb. 26, 2019
USD ($)
Mar. 31, 2019
USD ($)
Facility
Feb. 28, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Long-Term Debt and Liquidity Matters            
Shot-term debt     $ 244,050,000   $ 76,400,000  
Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing June 2019            
Long-Term Debt and Liquidity Matters            
Debt instrument, term     364 days      
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)           $ 150,000,000
Shot-term debt     $ 49,000,000      
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 | 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     38,000,000      
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            
Long-Term Debt and Liquidity Matters            
Shot-term debt     157,500,000   $ 0  
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 | 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 | Term Loan Facility            
Long-Term Debt and Liquidity Matters            
Extinguishment of debt $ 500,000,000          
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     $ 158,000,000      
LIBOR | Pinnacle West | Revolving Credit Facility | Revolving credit facility maturing June 2019            
Long-Term Debt and Liquidity Matters            
Debt instrument, basis spread on variable rate     0.70%      
LIBOR | APS | Term Loan            
Long-Term Debt and Liquidity Matters            
Debt instrument, basis spread on variable rate   0.50%