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Long-Term Debt and Liquidity Matters - Narrative (Details)
9 Months Ended
Jun. 17, 2020
USD ($)
May 22, 2020
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Jan. 15, 2020
USD ($)
Sep. 30, 2020
USD ($)
Facility
Sep. 30, 2019
USD ($)
Sep. 11, 2020
USD ($)
Jun. 16, 2020
USD ($)
May 05, 2020
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May 04, 2020
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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       34,000,000              
Pinnacle West | Term Loan                      
Long-Term Debt and Liquidity Matters                      
Long-term line of credit       $ 24,000,000              
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%       2.65%          
APS | Senior Unsecured Notes | Senior notes                      
Long-Term Debt and Liquidity Matters                      
Debt instrument, face amount   $ 600,000,000 $ 250,000,000     $ 400,000,000          
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 | 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%