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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Long-Term Debt and Liquidity Matters [Line Items]    
Total long-term debt $ 7,063,735 $ 6,314,266
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 6,913,735 6,314,266
Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt 7,115,975  
Unamortized discount (34) (44)
Unamortized debt issue costs (2,924) (3,635)
Total long-term debt 797,042 496,321
Less current maturities 150,000 0
Total long-term debt less current maturities 647,042 496,321
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 647,139 496,321
Arizona Public Service Company    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt 6,315,975  
Unamortized discount (14,995) (15,900)
Unamortized premium 13,575 14,781
Unamortized debt issue costs (47,862) (46,911)
Total long-term debt 6,266,693 5,817,945
Less current maturities 0 0
Total long-term debt less current maturities 6,266,693 5,817,945
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 6,266,693 5,817,945
Pollution control bonds - Variable | Arizona Public Service Company    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 35,975 $ 35,975
Weighted-average interest rate (as a percent) 0.22% 0.18%
Total pollution control bonds | Arizona Public Service Company    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 35,975 $ 35,975
Senior unsecured notes | Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 500,000 500,000
Interest rate (as a percent) 1.30%  
Senior unsecured notes | Arizona Public Service Company    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 6,280,000 5,830,000
Senior unsecured notes | Arizona Public Service Company | Minimum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 2.20%  
Senior unsecured notes | Arizona Public Service Company | Maximum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 6.88%  
Term loan | Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Term loans $ 300,000 $ 0
Term loan | Arizona Public Service Company    
Long-Term Debt and Liquidity Matters [Line Items]    
Weighted-average interest rate (as a percent) 0.81%