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Long-Term Debt and Liquidity Matters - Narrative (Details)
6 Months Ended
Jun. 17, 2020
USD ($)
May 22, 2020
USD ($)
Jan. 15, 2020
USD ($)
Jun. 30, 2020
USD ($)
Facility
Jun. 30, 2019
USD ($)
Jun. 16, 2020
USD ($)
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
Repayment of long-term debt       $ 800,000,000 $ 500,000,000          
Long-term debt limit       7,500,000,000            
Senior Unsecured Notes                    
Long-Term Debt and Liquidity Matters                    
Debt instrument, interest rate 1.30%         2.25%        
Senior Unsecured Notes | Senior notes                    
Long-Term Debt and Liquidity Matters                    
Debt instrument, face amount $ 500,000,000         $ 300,000,000        
Term Loan                    
Long-Term Debt and Liquidity Matters                    
Repayment of long-term debt $ 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            
Long-term line of credit       0            
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       41,000,000            
Pinnacle West | Term Loan                    
Long-Term Debt and Liquidity Matters                    
Long-term line of credit       $ 31,000,000            
Debt instrument, face amount             $ 31,000,000 $ 50,000,000    
Variable rate       1.40%            
APS                    
Long-Term Debt and Liquidity Matters                    
Repayment of long-term debt       $ 350,000,000 $ 500,000,000          
Long-term debt limit                 $ 5,900,000,000  
APS | Senior Unsecured Notes                    
Long-Term Debt and Liquidity Matters                    
Debt instrument, interest rate   3.35%                
APS | Senior Unsecured Notes | Senior notes                    
Long-Term Debt and Liquidity Matters                    
Debt instrument, face amount   $ 600,000,000 $ 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       0            
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       $ 220,000,000            
APS | Term Loan                    
Long-Term Debt and Liquidity Matters                    
Repayment of long-term debt   $ 200,000,000                
Minimum | APS | Senior Unsecured Notes                    
Long-Term Debt and Liquidity Matters                    
Debt instrument, interest rate     2.20%