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Long-Term Debt and Liquidity Matters - Components of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Long-Term Debt and Liquidity Matters [Line Items]    
Total long-term debt $ 4,146,785 $ 3,819,971
Long-term debt less current maturities 4,021,785 3,462,391
APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt 4,058,125  
Unamortized discount (11,816) (10,374)
Unamortized premium 4,506 4,686
Unamortized debt issue costs (29,030) (27,896)
Total long-term debt 4,021,785 3,694,971
Less current maturities 0 (357,580)
Total long-term debt less current maturities 4,021,785 3,337,391
Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt 4,183,125  
Total long-term debt 125,000 125,000
Long-term debt less current maturities 0 125,000
Pollution Control Bonds - Variable | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 35,975 $ 92,405
Pollution Control Bonds - Variable | APS | Minimum    
Long-Term Debt and Liquidity Matters [Line Items]    
Weighted-average interest rate (as a percent) 0.81% 0.01%
Pollution Control Bonds - Variable | APS | Maximum    
Long-Term Debt and Liquidity Matters [Line Items]    
Weighted-average interest rate (as a percent)   0.24%
Pollution Control Bonds - Fixed | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 147,150 $ 211,150
Pollution Control Bonds - Fixed | APS | Minimum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 1.75% 1.75%
Pollution Control Bonds - Fixed | APS | Maximum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 4.70% 4.70%
Total Pollution Control Bonds | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 183,125 $ 303,555
Senior unsecured notes | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Gross long-term debt $ 3,725,000 $ 3,375,000
Senior unsecured notes | APS | Minimum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 2.20% 2.20%
Senior unsecured notes | APS | Maximum    
Long-Term Debt and Liquidity Matters [Line Items]    
Interest rate (as a percent) 8.75% 8.75%
Term loan facility | Pinnacle West    
Long-Term Debt and Liquidity Matters [Line Items]    
Total long-term debt $ 125,000 $ 125,000
Less current maturities (125,000) 0
Total long-term debt less current maturities $ 0 $ 125,000
Weighted-average interest rate (as a percent) 1.52% 1.174%
Term loan | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Weighted-average interest rate (as a percent) 1.427% 1.024%
Term loan | Term loan facility maturing June 26, 2018 | APS    
Long-Term Debt and Liquidity Matters [Line Items]    
Term loans $ 150,000 $ 50,000