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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 17, 2020
Jun. 16, 2020
May 22, 2020
Dec. 31, 2019
Long-Term Debt and Liquidity Matters [Line Items]          
Total long-term debt $ 6,314,266       $ 5,632,558
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 6,314,266       4,832,558
Pinnacle West          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt 6,365,975        
Unamortized discount (44)       (57)
Unamortized debt issue costs (3,635)       (518)
Total long-term debt 496,321       449,425
Less current maturities 0       450,000
Total long-term debt less current maturities 496,321       (575)
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 496,321       (575)
ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt 5,865,975        
Unamortized discount (15,900)       (12,434)
Unamortized premium 14,781       7,423
Unamortized debt issue costs (46,911)       (37,981)
Total long-term debt 5,817,945       5,183,133
Less current maturities 0       350,000
Total long-term debt less current maturities 5,817,945       4,833,133
TOTAL LONG-TERM DEBT LESS CURRENT MATURITIES 5,817,945       4,833,133
Pollution Control Bonds - Variable | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt $ 35,975       $ 35,975
Pollution Control Bonds - Variable | ARIZONA PUBLIC SERVICE COMPANY | Minimum          
Long-Term Debt and Liquidity Matters [Line Items]          
Weighted-average interest rate (as a percent) 0.18%       1.54%
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt $ 0       $ 115,150
Interest rate (as a percent) 4.70%        
Total Pollution Control Bonds | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt $ 35,975       151,125
Senior unsecured notes          
Long-Term Debt and Liquidity Matters [Line Items]          
Interest rate (as a percent)   1.30% 2.25%    
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt $ 5,830,000       4,875,000
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Minimum          
Long-Term Debt and Liquidity Matters [Line Items]          
Interest rate (as a percent) 2.55%     3.35%  
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY | Maximum          
Long-Term Debt and Liquidity Matters [Line Items]          
Interest rate (as a percent) 6.88%        
Senior unsecured notes | Pinnacle West          
Long-Term Debt and Liquidity Matters [Line Items]          
Gross long-term debt $ 500,000       300,000
Interest rate (as a percent) 1.30%        
Term loan | Term loans | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Term loans $ 0       200,000
Term loan | Term Loan Facility Maturing 2020 | Pinnacle West          
Long-Term Debt and Liquidity Matters [Line Items]          
Term loans $ 0       $ 150,000
Weighted-average interest rate (as a percent)         2.20%
Term loan | Term Loan Facility Maturing 2020 | ARIZONA PUBLIC SERVICE COMPANY          
Long-Term Debt and Liquidity Matters [Line Items]          
Weighted-average interest rate (as a percent)         2.12%