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Long-Term Debt and Liquidity Matters - Narrative (Details)
9 Months Ended
Oct. 27, 2015
USD ($)
May. 19, 2015
USD ($)
Sep. 30, 2015
USD ($)
Facility
Sep. 30, 2014
USD ($)
Sep. 02, 2015
USD ($)
Jun. 26, 2015
USD ($)
May. 28, 2015
USD ($)
Jan. 12, 2015
USD ($)
Dec. 31, 2014
USD ($)
Long-Term Debt and Liquidity Matters                  
Repayments of debt     $ 344,847,000 $ 503,583,000          
Debt Provisions                  
Total shareholder equity     4,653,651,000           $ 4,367,493,000
Pinnacle West | Letter of Credit | Revolving credit facility that matures in May 2019                  
Long-Term Debt and Liquidity Matters                  
Outstanding letters of credit     0            
Pinnacle West | Revolving Credit Facility | Revolving credit facility that matures in May 2019                  
Long-Term Debt and Liquidity Matters                  
Current borrowing capacity on credit facility     200,000,000            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     300,000,000            
Outstanding borrowings     0            
Pinnacle West | Commercial paper | Revolving credit facility that matures in May 2019                  
Long-Term Debt and Liquidity Matters                  
Maximum commercial paper support available under credit facility     200,000,000            
Commercial paper     0            
APS                  
Long-Term Debt and Liquidity Matters                  
Repayments of debt     344,847,000 $ 503,583,000          
Debt Provisions                  
Total shareholder equity     4,757,154,000           $ 4,478,243,000
APS | ACC                  
Debt Provisions                  
Total shareholder equity     4,800,000,000            
Total capitalization     8,500,000,000            
Dividend restrictions, shareholder equity required     $ 3,400,000,000            
APS | ACC | Minimum                  
Debt Provisions                  
Required common equity ratio ordered by ACC (as a percent) (at least)     40.00%            
APS | Arizona pollution control revenue refunding bond, 2009 series A due 2029                  
Long-Term Debt and Liquidity Matters                  
Repurchased debt             $ 32,000,000    
APS | Letter of Credit                  
Long-Term Debt and Liquidity Matters                  
Outstanding letters of credit     $ 76,000,000            
APS | Letter of Credit | Revolving Credit Facilities Maturing in 2020 and 2019 [Member]                  
Long-Term Debt and Liquidity Matters                  
Outstanding letters of credit     0            
APS | Revolving Credit Facility | Revolving credit facility maturing April 2018                  
Long-Term Debt and Liquidity Matters                  
Current borrowing capacity on credit facility         $ 500,000,000        
APS | Revolving Credit Facility | Revolving Credit Facilities Maturing in 2020 and 2019 [Member]                  
Long-Term Debt and Liquidity Matters                  
Current borrowing capacity on credit facility     1,000,000,000            
Outstanding borrowings     $ 0            
Number of line of credit facilities | Facility     2            
APS | Revolving Credit Facility | Revolving credit facility maturing September 2020                  
Long-Term Debt and Liquidity Matters                  
Current borrowing capacity on credit facility     $ 500,000,000   $ 500,000,000        
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     700,000,000            
APS | Revolving Credit Facility | Revolving credit facility maturing May 2019                  
Long-Term Debt and Liquidity Matters                  
Current borrowing capacity on credit facility     500,000,000            
Maximum borrowing capacity on credit facility upon satisfaction of certain conditions and consent of lenders (up to)     700,000,000            
APS | Commercial paper                  
Long-Term Debt and Liquidity Matters                  
Maximum commercial paper support available under credit facility     250,000,000            
Commercial paper     $ 57,000,000            
APS | Secured debt | Term loan facility maturing June 26, 2018                  
Long-Term Debt and Liquidity Matters                  
Debt issued           $ 50,000,000      
APS | Senior Notes | 2.20% unsecured senior notes that mature on January 15, 2020                  
Long-Term Debt and Liquidity Matters                  
Debt issued               $ 250,000,000  
Interest rate (as a percent)               2.20%  
APS | Senior Notes | 3.15% unsecured senior notes that mature on May 15, 2025                  
Long-Term Debt and Liquidity Matters                  
Debt issued   $ 300,000,000              
Interest rate (as a percent)   3.15%              
APS | Senior Notes | 4.65% unsecured senior notes that mature on May 15, 2015                  
Long-Term Debt and Liquidity Matters                  
Interest rate (as a percent)   4.65%              
Repayments of debt   $ 300,000,000              
Current Maturities of Long-term Debt | Subsequent Event | APS | Arizona pollution control revenue refunding bond, 2009 series A                  
Long-Term Debt and Liquidity Matters                  
Bond redemption, principal amount $ 38,000,000