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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-Term Debt and Liquidity Matters [Line Items]    
Total long-term debt $ 5,138,232 $ 4,871,713
Long-term debt less current maturities (Note 6) $ 4,638,232 4,789,713
Interest rate (as a percent) 3.90%  
Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 5,176,125  
Unamortized discount (121) (184)
Unamortized debt issue costs (1,083) (1,395)
Total long-term debt 448,796 298,421
Less current maturities 0 0
Total long-term debt less current maturities 448,796 298,421
Long-term debt less current maturities (Note 6) 448,796 298,421
ARIZONA PUBLIC SERVICE COMPANY    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt 4,726,125  
Unamortized discount (12,638) (11,288)
Unamortized premium 7,736 8,049
Unamortized debt issue costs (31,787) (31,594)
Total long-term debt 4,689,436 4,573,292
Less current maturities 500,000 82,000
Total long-term debt less current maturities 4,189,436 4,491,292
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) 1.76% 1.77%
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 115,150 $ 147,150
Pollution Control Bonds - Fixed | ARIZONA PUBLIC SERVICE COMPANY | Maximum    
Long-Term Debt and Liquidity Matters [Line Items]    
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 $ 151,125 183,125
Senior unsecured notes | ARIZONA PUBLIC SERVICE COMPANY    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 4,575,000 4,275,000
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) 8.75%  
Senior unsecured notes | Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 300,000 $ 300,000
Interest rate (as a percent) 2.25%  
Term loan | ARIZONA PUBLIC SERVICE COMPANY    
Long-Term Debt and Liquidity Matters [Line Items]    
Weighted-average interest rate (as a percent)   2.24%
Term loan | Term loans | ARIZONA PUBLIC SERVICE COMPANY    
Long-Term Debt and Liquidity Matters [Line Items]    
Term loans $ 0 $ 150,000
Term loan | Term Loan Facility Maturing 2020 | Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Term loans $ 150,000 $ 0
Weighted-average interest rate (as a percent) 3.02%