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Long-Term Debt and Liquidity Matters (Details) - USD ($)
12 Months Ended
Nov. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 11, 2017
Dec. 15, 2016
May 06, 2016
Feb. 06, 2013
Feb. 05, 2013
Debt Provisions                  
Total shareholder equity   $ 5,006,690,000 $ 4,803,622,000            
Maximum                  
Debt Provisions                  
Ratio of consolidated debt to consolidated capitalization (as a percent)   65.00%              
Pinnacle West                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Contribution to subsidiaries $ 150,000,000 $ 178,027,000 19,242,000 $ 3,491,000          
Debt Provisions                  
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent)   50.00%              
Total shareholder equity   $ 5,006,690,000 4,803,622,000            
ARIZONA PUBLIC SERVICE COMPANY                  
Debt Provisions                  
Actual ratio of consolidated debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent)   47.00%              
Total shareholder equity   $ 5,256,829,000 $ 4,905,680,000            
ARIZONA PUBLIC SERVICE COMPANY | ACC                  
Debt Provisions                  
Total shareholder equity   5,300,000,000              
Total capitalization   10,000,000,000              
Dividend restrictions, shareholder equity required   $ 4,000,000,000              
Long term debt authorization           $ 5,100,000,000   $ 5,100,000,000.0 $ 4,200,000,000.0
ARIZONA PUBLIC SERVICE COMPANY | Minimum | ACC                  
Debt Provisions                  
Required common equity ratio ordered by ACC (as a percent) (at least)   40.00%              
Senior unsecured notes | Pinnacle West                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Notes issued $ 300,000,000                
Interest rate (as a percent) 2.25% 2.25%              
Term loans | ARIZONA PUBLIC SERVICE COMPANY | Term loan                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Principal balance repaid $ 125,000,000                
Unsecured Senior Notes 4.35 Percent Mature on 15 November, 2045 | ARIZONA PUBLIC SERVICE COMPANY | Senior notes                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Notes issued             $ 250,000,000    
Interest rate (as a percent)             4.35%    
Unsecured Senior Notes 2.95 Percent Mature on 15 September, 2027 | ARIZONA PUBLIC SERVICE COMPANY | Senior notes                  
Long-Term Debt and Liquidity Matters [Line Items]                  
Notes issued         $ 300,000,000        
Interest rate (as a percent)         2.95%